diff --git a/cc_audio_transfer.py b/cc_audio_transfer.py
new file mode 100644
index 0000000..8e2c82a
--- /dev/null
+++ b/cc_audio_transfer.py
@@ -0,0 +1,269 @@
+from pathlib import Path
+import subprocess
+import numpy as np
+from scipy.signal import correlate
+import tempfile
+import soundfile as sf
+import matplotlib.pyplot as plt
+import subprocess
+import sys
+import os
+import glob
+import shutil
+
+DEBUG = False
+
+def run(cmd):
+    """
+    Run a subprocess command.
+
+    Args:
+        cmd: Command and arguments as a list.
+
+    Raises:
+        subprocess.CalledProcessError: If the command exits with a non-zero status.
+    """
+    try:
+        result = subprocess.run(
+            cmd,
+            check=True,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT,
+            text=True
+        )
+        return result
+    except subprocess.CalledProcessError as e:
+        print(e.stdout)
+        raise
+	
+
+def extract_audio(file: Path, duration: float):
+    tmp = tempfile.NamedTemporaryFile(suffix=".wav", delete=False)
+
+    subprocess.run([
+        "ffmpeg",
+        "-y",
+        "-i", str(file),
+        "-map", "0:a:0",        # first audio stream
+        "-ac", "1",             # mono
+        "-ar", "44100",         # fixed sample rate
+        "-t", str(duration),    # limit duration
+        tmp.name
+    ], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+
+    data, sr = sf.read(tmp.name)
+    return data, sr
+
+
+def get_audio_offset(file1: Path, file2: Path, important_time: float):
+    sig1, sr1 = extract_audio(file1, important_time)
+    sig2, sr2 = extract_audio(file2, important_time)
+
+    if sr1 != sr2:
+        raise ValueError("Sample rates do not match")
+
+    # normalize signals
+    sig1 = sig1 - np.mean(sig1)
+    sig2 = sig2 - np.mean(sig2)
+
+    corr = correlate(sig1, sig2, mode="full")
+    lag = np.argmax(corr) - (len(sig2) - 1)
+
+    offset_seconds = lag / sr1
+    return offset_seconds
+
+def probe_video(path: Path):
+    """Get video FPS, duration, codec, and stream start time."""
+    import json
+    cmd = [
+        "ffprobe",
+        "-v", "error",
+        "-print_format", "json",
+        "-show_streams",
+        "-show_format",
+        path
+    ]
+    data = json.loads(subprocess.run(cmd, capture_output=True, text=True, check=True).stdout)
+
+    duration = float(data["format"]["duration"])
+    for s in data["streams"]:
+        if s["codec_type"] == "video":
+            num, den = s["r_frame_rate"].split("/")
+            fps = float(num) / float(den)
+            codec = s["codec_name"]
+            start_time = float(s.get("start_time", 0))
+            return fps, duration, codec, start_time
+
+    raise RuntimeError("No video stream found")
+
+def trim_audio(German_Videout_mkv: Path, start_time: float, end_time: float, out_audio: Path):
+    """
+    Extract a segment of the first audio track from a video file.
+
+    Uses FFmpeg to copy the selected audio range without re-encoding,
+    which makes the operation fast and preserves the original audio quality.
+
+    Args:
+        German_Videout_mkv: Path to the source video file.
+        start_time: Start time of the audio segment (seconds or FFmpeg time format).
+        end_time: End time of the audio segment.
+        out_audio: Path to the output audio file.
+
+    Notes:
+        The function selects the first audio stream (`0:a:0`) and copies it
+        directly (`-c:a copy`), meaning the codec and quality remain unchanged.
+    """
+    run([
+        "ffmpeg",
+        "-y",
+        "-i", German_Videout_mkv,
+        "-ss", str(start_time),
+        "-to", str(end_time),
+        "-map", "0:a:0",      # first audio track
+        "-c:a", "copy",       # no re-encode
+        out_audio
+    ])
+
+def mux_audio_into_output(Quality_Video, audio_file, output_dir):
+    """Mux trimmed audio into Quality_Video and place final file in output_dir."""
+    output_dir = Path(output_dir)
+    output_dir.mkdir(exist_ok=True)
+
+    # final_output = output_dir / f"{Path(Quality_Video).stem}_ger.mkv"
+    final_output = output_dir / f"{Path(Quality_Video).stem}.mkv"
+
+    run([
+        "mkvmerge",
+        "-o", str(final_output),
+        str(Quality_Video),
+        "--language", "0:deu",  # assign German language
+        "--track-name", "0:German (2.0 aac)",
+        str(audio_file)
+    ])
+
+    return final_output
+
+def stick_together_audio(left_audio: Path, right_audio: Path, output_audio: Path) -> None:
+    """
+    Concatenate two audio files so that left_audio plays directly
+    before right_audio in the output file.
+    """
+
+    left_audio = Path(left_audio)
+    right_audio = Path(right_audio)
+    output_audio = Path(output_audio)
+
+    # Use stem instead of prefix to create a temporary file
+    output_audio_tmp = output_audio.parent / (output_audio.stem + "_temp" + output_audio.suffix)
+
+    run([
+        "ffmpeg",
+        "-y",
+        "-i", str(left_audio),
+        "-i", str(right_audio),
+        "-filter_complex", "[0:a][1:a]concat=n=2:v=0:a=1[a]",
+        "-map", "[a]",
+        "-c:a", "opus",   # or "aac" if you prefer
+        "-strict", "-2",
+        str(output_audio_tmp)
+    ])
+
+    shutil.move(output_audio_tmp, output_audio)
+
+def process_one(German_Video: Path, Quality_Video: Path, output_dir: Path):
+    # --- Probe video ---
+    fps, duration, _, vstart = probe_video(German_Video)
+    fps2, duration2, _, vstart2 = probe_video(Quality_Video)
+
+    if duration <= 0:
+        raise ValueError("Duration of German_Video must be greater than 0")
+    if duration2 <= 0:
+        raise ValueError("Duration of Quality_Video must be greater than 0")
+    
+    offset = get_audio_offset(Quality_Video, German_Video, 30)
+    print(f"Offset: {offset}s")
+
+    if offset > duration or offset > duration2:
+        raise ValueError("Offset needs to be smaller than the video durations")
+
+    # print(f"fps: {fps}")
+    # print(f"Cutting audio from frame {n1} (timestamp {start:.6f}s) to timestamp {end:.6f}s")
+
+    # --- Trim only audio ---
+    german_audio_file = output_dir / f"{Path(Quality_Video).stem}_german_audio.mka"
+    quality_audio_file1 = output_dir / f"{Path(Quality_Video).stem}_original_audio1.mka"
+    quality_audio_file2 = output_dir / f"{Path(Quality_Video).stem}_original_audio2.mka"
+    if os.path.isfile(quality_audio_file1):
+        os.remove(quality_audio_file1)
+    if os.path.isfile(quality_audio_file2):
+        os.remove(quality_audio_file2)
+
+    start2 = vstart2
+    end2 = start2 + offset
+    if end2 > start2:
+        if DEBUG: print(f"Cutting audio ({quality_audio_file1}) (from timestamp {start2:.6f}s) to timestamp {end2:.6f}s")
+        trim_audio(Quality_Video, start2, end2, quality_audio_file1)
+
+    start = vstart
+    end = start + duration
+    if DEBUG: print(f"Cutting audio ({german_audio_file}) (from timestamp {start:.6f}s) to timestamp {end:.6f}s")
+    trim_audio(German_Video, start, end, german_audio_file)
+    # Get the end from the first original audio
+    # start2 = vstart2 + end
+    # end2 = start2 + (duration2 - duration - offset)
+    # if end2 > start2:
+    #     if DEBUG: print(f"Cutting audio ({quality_audio_file2}) (from timestamp {start2:.6f}s) to timestamp {end2:.6f}s")
+    #     trim_audio(Quality_Video, start2, end2, quality_audio_file2)
+
+    if os.path.isfile(quality_audio_file1):
+        stick_together_audio(quality_audio_file1, german_audio_file, german_audio_file)
+    if os.path.isfile(quality_audio_file2):
+        stick_together_audio(german_audio_file, quality_audio_file2, german_audio_file)
+
+    # --- Mux trimmed audio ---
+    final_file = mux_audio_into_output(Quality_Video, german_audio_file, output_dir)
+
+    print(f"Final file with trimmed audio created at: {final_file}")
+
+    print(f"Removing tmp Audiofiles")
+    if os.path.isfile(german_audio_file):
+        os.remove(german_audio_file)
+    if os.path.isfile(quality_audio_file1):
+        os.remove(quality_audio_file1)
+    if os.path.isfile(quality_audio_file2):
+        os.remove(quality_audio_file2)
+
+def main():
+    output_dir = "/home/honney/projects/mkv/output_dir"
+    # for i in range(1, 14):
+    for i in [7, 8, 10, 11, 13, 16, 17, 19, 20, 22, 25]:
+        # --- German_Videouts ---
+        pattern = f"AnoHana The Flower We Saw That Day (2011-2011) [imdbid-tt1913273]/Season 01/AnoHana The Flower We Saw That Day S01E0{i:02}.mkv"
+        German_Video = glob.glob(pattern)
+        pattern = f"Anohana - The Flower We Saw That Day/S01/AnoHana The Flower We Saw That Day S01E0{i:02}.mkv"
+        Quality_Video = glob.glob(pattern)
+
+        if len(German_Video) > 1:
+            raise ValueError("There are to many videos matching the German wildcard")
+        if len(Quality_Video) > 1:
+            raise ValueError("There are to many videos matching the Quality wildcard")
+        
+        process_one(Path(German_Video[0]), Path(Quality_Video[0]), Path(output_dir))
+        sys.exit()
+
+
+if __name__ == "__main__":
+    if len(sys.argv) == 3:
+        print(sys.argv)
+        print(f"German_Video={sys.argv[1]}")
+        print(f"Quality_Video={sys.argv[2]}")
+        process_one(German_Video=Path(sys.argv[1]), Quality_Video=Path(sys.argv[2]), output_dir=Path("./output_dir"))
+    elif len(sys.argv) == 4:
+        print(sys.argv)
+        print(f"German_Video={sys.argv[1]}")
+        print(f"Quality_Video={sys.argv[2]}")
+        process_one(German_Video=Path(sys.argv[1]), Quality_Video=Path(sys.argv[2]), output_dir=Path(sys.argv[3]))
+    else:
+        # print(len(sys.argv), sys.argv)
+        # sys.exit()
+        main()
diff --git a/chapter_OP_ED_detection.py b/chapter_OP_ED_detection.py
new file mode 100644
index 0000000..1341b0e
--- /dev/null
+++ b/chapter_OP_ED_detection.py
@@ -0,0 +1,62 @@
+from pathlib import Path
+from typing import Tuple, List, Optional
+import subprocess
+import json
+
+def run(cmd):
+    """
+    Run a subprocess command.
+
+    Args:
+        cmd: Command and arguments as a list.
+
+    Raises:
+        subprocess.CalledProcessError: If the command exits with a non-zero status.
+    """
+    try:
+        result = subprocess.run(
+            cmd,
+            check=True,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT,
+            text=True
+        )
+        return result
+    except subprocess.CalledProcessError as e:
+        print(e.stdout)
+        raise
+
+
+def _get_chapters(file: Path) -> List[Tuple[float, float]]:
+    """Return list of (start_time, duration) for each chapter."""
+    cmd = [
+        "ffprobe",
+        "-i", str(file),
+        "-print_format", "json",
+        "-show_chapters",
+        "-loglevel", "error"
+    ]
+
+    result = run(cmd)
+    data = json.loads(result.stdout)
+
+    chapters = []
+    for ch in data.get("chapters", []):
+        start = float(ch["start_time"])
+        end = float(ch["end_time"])
+        duration = end - start
+        chapters.append((start, duration))
+
+    return chapters
+
+if __name__ == '__main__':
+    file = "/home/honney/projects/mkv/output_dir/08.mkv"
+    chapters = _get_chapters(Path(file))
+    time = 90
+    min_len = time / 2
+    max_len = time * 2
+    filtered = [
+        (start, dur) for start, dur in chapters
+        if min_len <= dur <= max_len
+    ]
+    print(filtered)
\ No newline at end of file
diff --git a/check_final_file.py b/check_final_file.py
new file mode 100644
index 0000000..3bd0886
--- /dev/null
+++ b/check_final_file.py
@@ -0,0 +1,210 @@
+from pathlib import Path
+from typing import Tuple, List, Optional
+import json
+import subprocess
+import tempfile
+import numpy as np
+import soundfile as sf
+from scipy.signal import correlate
+
+def run(cmd):
+    """
+    Run a subprocess command.
+
+    Args:
+        cmd: Command and arguments as a list.
+
+    Raises:
+        subprocess.CalledProcessError: If the command exits with a non-zero status.
+    """
+    try:
+        result = subprocess.run(
+            cmd,
+            check=True,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT,
+            text=True
+        )
+        return result
+    except subprocess.CalledProcessError as e:
+        print(e.stdout)
+        raise
+
+def _get_chapters(file: Path) -> List[Tuple[float, float]]:
+    """Return list of (start_time, duration) for each chapter."""
+    cmd = [
+        "ffprobe",
+        "-i", str(file),
+        "-print_format", "json",
+        "-show_chapters",
+        "-loglevel", "error"
+    ]
+
+    result = run(cmd)
+    data = json.loads(result.stdout)
+
+    chapters = []
+    for ch in data.get("chapters", []):
+        start = float(ch["start_time"])
+        end = float(ch["end_time"])
+        duration = end - start
+        chapters.append((start, duration))
+
+    return chapters
+
+
+def get_intro(file: Path, time: float) -> Tuple[float, float]:
+    """
+    Find the chapter whose duration is closest to `time`,
+    considering only chapters with duration between time/2 and time*2.
+    Returns (start_time, duration).
+    """
+    chapters = _get_chapters(file)
+
+    if not chapters:
+        raise ValueError("No chapters found")
+
+    # Filter by allowed duration range
+    min_len = time / 2
+    max_len = time * 2
+    filtered = [
+        (start, dur) for start, dur in chapters
+        if min_len <= dur <= max_len
+    ]
+
+    if not filtered:
+        raise ValueError("No chapters match duration constraints")
+
+    # Sort by closeness to target time
+    filtered.sort(key=lambda x: abs(x[1] - time))
+
+    # Take the two closest
+    closest_two = filtered[:2]
+
+    # Choose the better one (closest duration)
+    best = min(closest_two, key=lambda x: abs(x[1] - time))
+
+    return best
+
+def get_audio_streams(file: Path) -> List[int]:
+    """
+    Return a list of available audio stream indices (0-based for ffmpeg mapping).
+    
+    Example return:
+        [0, 1]  -> corresponds to 0:a:0 and 0:a:1
+    """
+    cmd = [
+        "ffprobe",
+        "-i", str(file),
+        "-select_streams", "a",
+        "-show_entries", "stream=index",
+        "-of", "json",
+        "-loglevel", "error"
+    ]
+
+    result = run(cmd)
+    data = json.loads(result.stdout)
+
+    # ffprobe gives absolute stream indices, but we want relative audio indices
+    streams = data.get("streams", [])
+
+    # Convert to 0-based audio stream numbering
+    return list(range(len(streams)))
+
+def extract_audio_segment(
+    file: Path,
+    intro: Tuple[float, float],
+    audio_stream: Optional[int] = None
+) -> Path:
+    """
+    Extract audio using (start, duration) from get_intro.
+
+    Parameters:
+        file: input video file
+        intro: (start, duration)
+        audio_stream: index of audio stream (0 = first audio track, etc.)
+
+    Returns:
+        Path to temporary audio file
+    """
+    start, duration = intro
+
+    tmp = tempfile.NamedTemporaryFile(suffix=".wav", delete=False)
+    tmp_path = Path(tmp.name)
+    tmp.close()
+
+    cmd = [
+        "ffmpeg",
+        "-y",
+        "-i", str(file),
+        "-ss", str(start),
+        "-t", str(duration),
+    ]
+
+    # Select specific audio stream if provided
+    if audio_stream is not None:
+        cmd += ["-map", f"0:a:{audio_stream}"]
+    else:
+        cmd += ["-map", "0:a:0"]  # default: first audio track
+
+    cmd += [
+        "-vn",
+        "-acodec", "pcm_s16le",
+        "-ar", "44100",
+        "-ac", "2",
+        str(tmp_path)
+    ]
+
+    run(cmd)
+    return tmp_path
+
+def extract_audio(file: Path, duration: float):
+    tmp = tempfile.NamedTemporaryFile(suffix=".wav", delete=False)
+
+    run([
+        "ffmpeg",
+        "-y",
+        "-i", str(file),
+        "-map", "0:a:0",        # first audio stream
+        "-ac", "1",             # mono
+        "-ar", "44100",         # fixed sample rate
+        "-t", str(duration),    # limit duration
+        tmp.name
+    ])
+
+    data, sr = sf.read(tmp.name)
+    return data, sr
+
+def get_audio_offset(file1: Path, file2: Path, important_time: float):
+    sig1, sr1 = extract_audio(file1, important_time)
+    sig2, sr2 = extract_audio(file2, important_time)
+
+    if sr1 != sr2:
+        raise ValueError("Sample rates do not match")
+
+    # normalize signals
+    sig1 = sig1 - np.mean(sig1)
+    sig2 = sig2 - np.mean(sig2)
+
+    corr = correlate(sig1, sig2, mode="full")
+    lag = np.argmax(corr) - (len(sig2) - 1)
+
+    offset_seconds = lag / sr1
+    return offset_seconds
+
+def check_final_file(video: Path, fps: float) -> bool:
+    try:
+        intro_duration = 90
+        intro = get_intro(video, 90.0)
+        audio_streams = get_audio_streams(video)
+        extract_path1 = extract_audio_segment(video, intro, audio_streams[0])
+        extract_path2 = extract_audio_segment(video, intro, audio_streams[-1])
+        offset = get_audio_offset(extract_path1, extract_path2, intro[-1])
+        if np.abs(offset) < (1/fps):
+            return True
+        else:
+            print(f"NOT CORRECT!!!!!!!!!!!!!!!!!!!!!!!!: {offset}, {1/fps}")
+            return False
+    except:
+        print("Chapter detection not working")
+        return False
\ No newline at end of file
diff --git a/detect_chapter.py b/detect_chapter.py
new file mode 100644
index 0000000..d71121a
--- /dev/null
+++ b/detect_chapter.py
@@ -0,0 +1,298 @@
+from pathlib import Path
+from typing import Tuple, List, Optional
+from scipy.signal import correlate
+import soundfile as sf
+import numpy as np
+import subprocess
+import json
+import tempfile
+import os
+
+
+def run(cmd):
+    """
+    Run a subprocess command.
+
+    Args:
+        cmd: Command and arguments as a list.
+
+    Raises:
+        subprocess.CalledProcessError: If the command exits with a non-zero status.
+    """
+    try:
+        result = subprocess.run(
+            cmd,
+            check=True,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT,
+            text=True
+        )
+        return result
+    except subprocess.CalledProcessError as e:
+        print(e.stdout)
+        raise
+
+def probe_video(path: Path):
+    """Get video FPS, duration, codec, and stream start time."""
+    import json
+    cmd = [
+        "ffprobe",
+        "-v", "error",
+        "-print_format", "json",
+        "-show_streams",
+        "-show_format",
+        path
+    ]
+    data = json.loads(run(cmd).stdout)
+
+    duration = float(data["format"]["duration"])
+    for s in data["streams"]:
+        if s["codec_type"] == "video":
+            num, den = s["r_frame_rate"].split("/")
+            fps = float(num) / float(den)
+            codec = s["codec_name"]
+            start_time = float(s.get("start_time", 0))
+            return fps, duration, codec, start_time
+
+    raise RuntimeError("No video stream found")
+
+def _get_chapters(file: Path) -> List[Tuple[float, float]]:
+    """Return list of (start_time, duration) for each chapter."""
+    cmd = [
+        "ffprobe",
+        "-i", str(file),
+        "-print_format", "json",
+        "-show_chapters",
+        "-loglevel", "error"
+    ]
+
+    result = run(cmd)
+    data = json.loads(result.stdout)
+
+    chapters = []
+    for ch in data.get("chapters", []):
+        start = float(ch["start_time"])
+        end = float(ch["end_time"])
+        duration = end - start
+        chapters.append((start, duration))
+
+    return chapters
+
+
+def get_intro(file: Path, time: float) -> Tuple[float, float]:
+    """
+    Find the chapter whose duration is closest to `time`,
+    considering only chapters with duration between time/2 and time*2.
+    Returns (start_time, duration).
+    """
+    chapters = _get_chapters(file)
+
+    if not chapters:
+        raise ValueError("No chapters found")
+
+    # Filter by allowed duration range
+    min_len = time / 2
+    max_len = time * 2
+    filtered = [
+        (start, dur) for start, dur in chapters
+        if min_len <= dur <= max_len
+    ]
+
+    if not filtered:
+        raise ValueError("No chapters match duration constraints")
+
+    # Sort by closeness to target time
+    filtered.sort(key=lambda x: abs(x[1] - time))
+
+    # Take the two closest
+    closest_two = filtered[:2]
+
+    # Choose the better one (closest duration)
+    best = min(closest_two, key=lambda x: abs(x[1] - time))
+
+    return best
+
+
+def extract_audio_segment(
+    file: Path,
+    intro: Tuple[float, float],
+    audio_stream: Optional[int] = None
+) -> Path:
+    """
+    Extract audio using (start, duration) from get_intro.
+
+    Parameters:
+        file: input video file
+        intro: (start, duration)
+        audio_stream: index of audio stream (0 = first audio track, etc.)
+
+    Returns:
+        Path to temporary audio file
+    """
+    start, duration = intro
+
+    tmp = tempfile.NamedTemporaryFile(suffix=".wav", delete=False)
+    tmp_path = Path(tmp.name)
+    tmp.close()
+
+    cmd = [
+        "ffmpeg",
+        "-y",
+        "-i", str(file),
+        "-ss", str(start),
+        "-t", str(duration),
+    ]
+
+    # Select specific audio stream if provided
+    if audio_stream is not None:
+        cmd += ["-map", f"0:a:{audio_stream}"]
+    else:
+        cmd += ["-map", "0:a:0"]  # default: first audio track
+
+    cmd += [
+        "-vn",
+        "-acodec", "pcm_s16le",
+        "-ar", "44100",
+        "-ac", "2",
+        str(tmp_path)
+    ]
+
+    run(cmd)
+    return tmp_path
+
+
+def get_audio_streams(file: Path) -> List[int]:
+    """
+    Return a list of available audio stream indices (0-based for ffmpeg mapping).
+    
+    Example return:
+        [0, 1]  -> corresponds to 0:a:0 and 0:a:1
+    """
+    cmd = [
+        "ffprobe",
+        "-i", str(file),
+        "-select_streams", "a",
+        "-show_entries", "stream=index",
+        "-of", "json",
+        "-loglevel", "error"
+    ]
+
+    result = run(cmd)
+    data = json.loads(result.stdout)
+
+    # ffprobe gives absolute stream indices, but we want relative audio indices
+    streams = data.get("streams", [])
+
+    # Convert to 0-based audio stream numbering
+    return list(range(len(streams)))
+
+
+def play_audio_segment(file: Path, intro: Tuple[float, float]) -> None:
+    """
+    Extract and play audio from (start, duration).
+    """
+    audio_file = extract_audio_segment(file, intro)
+
+    try:
+        run(
+            ["ffplay", "-nodisp", "-autoexit", str(audio_file)]
+        )
+    finally:
+        os.remove(audio_file)
+
+def extract_audio(file: Path, duration: float):
+    tmp = tempfile.NamedTemporaryFile(suffix=".wav", delete=False)
+
+    run([
+        "ffmpeg",
+        "-y",
+        "-i", str(file),
+        "-map", "0:a:0",        # first audio stream
+        "-ac", "1",             # mono
+        "-ar", "44100",         # fixed sample rate
+        "-t", str(duration),    # limit duration
+        tmp.name
+    ])
+
+    data, sr = sf.read(tmp.name)
+    return data, sr
+
+def get_audio_offset(file1: Path, file2: Path, important_time: float):
+    sig1, sr1 = extract_audio(file1, important_time)
+    sig2, sr2 = extract_audio(file2, important_time)
+
+    if sr1 != sr2:
+        raise ValueError("Sample rates do not match")
+
+    # normalize signals
+    sig1 = sig1 - np.mean(sig1)
+    sig2 = sig2 - np.mean(sig2)
+
+    corr = correlate(sig1, sig2, mode="full")
+    lag = np.argmax(corr) - (len(sig2) - 1)
+
+    offset_seconds = lag / sr1
+    return offset_seconds
+
+def main(video: Path) -> bool:
+
+    intro_duration = 90
+    print("finding intro")
+    intro = get_intro(video, 90.0)
+    print("geting audio streams")
+    audio_streams = get_audio_streams(video)
+    print("extract first intro")
+    extract_path1 = extract_audio_segment(video, intro, audio_streams[0])
+    print("extract second intro")
+    extract_path2 = extract_audio_segment(video, intro, audio_streams[-1])
+
+    # # or directly play:
+    # time = (0, 20)
+    # play_audio_segment(extract_path1, time)
+    # play_audio_segment(extract_path2, time)
+
+    fps, _, _, _ = probe_video(video)
+
+    print("Calculate")
+
+    offset = get_audio_offset(extract_path1, extract_path2, intro[-1]-10)
+
+    if np.abs(offset) < (1/fps):
+        print(f"no offset: {offset}")
+        return True
+    else:
+        print(f"NOT CORRECT!!!!!!!!!!!!!!!!!!!!!!!!: {offset}, {1/fps}")
+        return False
+
+extensions=("mp4", "mkv", "avi", "mov", "wmv", "flv", "webm", "lrv", "gif")
+
+def check_video_ext(video: Path) -> bool:
+    if video.suffix.strip(".").lower() in extensions:
+        return True
+    return False
+
+if __name__ == '__main__':
+    import sys
+    # sys.argv.remove(sys.argv[0])
+    if len(sys.argv) == 2:
+        print("One file")
+        if os.path.isfile(sys.argv[1]):
+            main(Path(sys.argv[1]))
+        else: raise
+    elif len(sys.argv) > 2:
+        sys.argv.remove(sys.argv[0])
+        error_files = []
+        for str_path in sys.argv:
+            video = Path(str_path)
+            if (check_video_ext(video)):
+                print(f"{video}")
+                working = main(video)
+                if not working:
+                    error_files.append(video)
+            else: print(f"Not a compatabile Video: {video}")
+        if error_files != []:
+            print(f"These files are broken:")
+            for file in error_files:
+                print(file)
+    else:
+        print(f"Use this script like this:\npython detect_chapter.py /path/to/file")
\ No newline at end of file
diff --git a/test1.py b/test1.py
new file mode 100644
index 0000000..4155d4a
--- /dev/null
+++ b/test1.py
@@ -0,0 +1,135 @@
+import subprocess
+import json
+import shutil
+from pathlib import Path
+from typing import List
+
+def run(cmd: subprocess._CMD) -> subprocess.CompletedProcess[str]:
+    """
+    Run a subprocess command.
+
+    Args:
+        cmd: Command and arguments as a list.
+
+    Raises:
+        subprocess.CalledProcessError: If the command exits with a non-zero status.
+    """
+    try:
+        result = subprocess.run(
+            cmd,
+            check=True,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT,
+            text=True
+        )
+        return result
+    except subprocess.CalledProcessError as e:
+        print(e.stdout)
+        raise
+
+def get_audio_streams(file: Path) -> List[int]:
+    """
+    Return a list of available audio stream indices (0-based for ffmpeg mapping).
+    
+    Example return:
+        [0, 1]  -> corresponds to 0:a:0 and 0:a:1
+    """
+    cmd = [
+        "ffprobe",
+        "-i", str(file),
+        "-select_streams", "a",
+        "-show_entries", "stream=index",
+        "-of", "json",
+        "-loglevel", "error"
+    ]
+
+    result = run(cmd)
+    data = json.loads(result.stdout)
+
+    # ffprobe gives absolute stream indices, but we want relative audio indices
+    streams = data.get("streams", [])
+
+    # Convert to 0-based audio stream numbering
+    return list(range(len(streams)))
+
+def get_track_info(file: Path, audioline: int):
+    """Gets codec, bitrate, language, and title."""
+    cmd = [
+        "ffprobe", "-v", "error", "-select_streams", f"a:{audioline}",
+        "-show_entries", "stream=codec_name,bit_rate:stream_tags=language,title",
+        "-of", "json", str(file)
+    ]
+    result = subprocess.run(cmd, capture_output=True, text=True)
+    data = json.loads(result.stdout)
+    if "streams" in data and len(data["streams"]) > 0:
+        s = data["streams"][0]
+        return {
+            "codec": s.get("codec_name", "aac"),
+            "bitrate": s.get("bit_rate", "192k"),
+            "lang": s.get("tags", {}).get("language", "eng"),
+            "title": s.get("tags", {}).get("title", f"Track {audioline}")
+        }
+    return {"codec": "aac", "bitrate": "192k", "lang": "eng", "title": "Audio"}
+
+def shift_audio(file: Path, audioline: int, offset: float):
+    """
+    Shifts audio by offset sekonds to the right.
+    """
+    if not file.is_file(): return
+    
+    info = get_track_info(file, audioline)
+    # mkvmerge uses 0 for video, usually 1+ for audio. 
+    # We need the MKV Toolnix Track ID.
+    mkv_id = audioline + 1 
+    
+    temp_mka = file.parent / "temp_shifted.mka"
+    output_mkv = file.parent / "temp_output.mkv"
+
+    # --- STEP 1: Physical Shift via Filter ---
+    # We convert offset to milliseconds for the 'adelay' filter
+    ms = int(abs(offset) * 1000)
+    
+    if offset > 0:
+        # RIGHT SHIFT: Delay start, then trim the end to keep original length
+        # 'all' applies delay to all channels
+        filter_str = f"adelay={ms}|{ms}|{ms}|{ms}|{ms}|{ms},atrim=0,atrim=duration=base" # Simplified logic below
+        # For reliability, we use a simpler pad/trim approach:
+        filter_chain = f"adelay={ms}:all=1"
+    else:
+        # LEFT SHIFT: Skip the beginning
+        filter_chain = f"atrim=start={abs(offset)}"
+
+    # Process to MKA
+    # We use the same codec and bitrate detected earlier
+    process_cmd = [
+        "ffmpeg", "-y", "-i", str(file),
+        "-map", f"0:a:{audioline}",
+        "-af", filter_chain,
+        "-c:a", info['codec'],
+        "-b:a", str(info['bitrate']),
+        str(temp_mka)
+    ]
+    subprocess.run(process_cmd, check=True)
+
+    # --- STEP 2: Replace in MKV via mkvmerge ---
+    # --audio-tracks !ID excludes the old track
+    # The new MKA is added at the end
+    merge_cmd = [
+        "mkvmerge", "-o", str(output_mkv),
+        "--audio-tracks", f"!{mkv_id}", str(file),
+        "--language", f"0:{info['lang']}",
+        "--track-name", f"0:{info['title']}",
+        str(temp_mka)
+    ]
+    
+    subprocess.run(merge_cmd, check=True)
+
+    # Cleanup and Replace
+    shutil.move(str(output_mkv), str(file))
+    temp_mka.unlink()
+    print(f"Done: {file.name} updated physically.")
+
+# Example usage:
+file_path = Path("/home/honney/mount/Media/tmp/serien/ready/Charlotte/Season 01/[NO CHAPTER]_E12.mkv")
+audio_streams = get_audio_streams(file_path)
+shift_audio(file_path, audioline=audio_streams[-1], offset=(1/23.98)) # Shifts the 2nd audio track right by 1.5 seconds
\ No newline at end of file
diff --git a/test2.py b/test2.py
new file mode 100644
index 0000000..0da1196
--- /dev/null
+++ b/test2.py
@@ -0,0 +1,185 @@
+import subprocess
+import tempfile
+import os
+from pathlib import Path
+from typing import List, Tuple, Optional
+
+import numpy as np
+from scipy.io import wavfile
+
+class ConfidenceError(Exception):
+    """Raised when an area is found but the energy difference is too low to be confident."""
+    pass
+
+class MissingDetectionError(Exception):
+    """Raised when the script fails to find both an intro and an outro."""
+    pass
+
+def get_video_duration(file: Path) -> float:
+    """Uses ffprobe to get the total duration of the video."""
+    cmd = [
+        "ffprobe", 
+        "-v", "error", 
+        "-show_entries", "format=duration", 
+        "-of", "default=noprint_wrappers=1:nokey=1", 
+        str(file)
+    ]
+    result = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)
+    try:
+        return float(result.stdout.strip())
+    except ValueError:
+        raise RuntimeError(f"Could not determine duration for {file}")
+
+def extract_audio_segment_tmp(
+    file: Path,
+    start_or_section: float | tuple[float, float],
+    end: Optional[float] = None,
+    audio_stream: Optional[int] = None
+) -> Path:
+    """Extracts audio using FFmpeg and saves it to a temporary WAV file."""
+    if isinstance(start_or_section, tuple):
+        if len(start_or_section) != 2:
+            raise ValueError("Tuple must strictly be (start, end)")
+        start = float(start_or_section[0])
+        duration = float(start_or_section[1])
+    elif isinstance(start_or_section, (int, float)):
+        if end is None:
+            raise ValueError("The 'end' parameter must be provided when using a separate start float.")
+        start = float(start_or_section)
+        end_time = float(end)
+        duration = end_time - start
+    else:
+        raise TypeError("Invalid type for start_or_section. Expected float or tuple.")
+    
+    if duration <= 0:
+        raise ValueError("Duration must be above 0")
+
+    tmp = tempfile.NamedTemporaryFile(suffix=".wav", delete=False)
+    tmp_path = Path(tmp.name)
+    tmp.close()
+
+    cmd = [
+        "ffmpeg", "-y",
+        "-i", str(file),
+        "-ss", str(start),
+        "-t", str(duration)
+    ]
+
+    if audio_stream is not None:
+        cmd += ["-map", f"0:a:{audio_stream}"]
+    else:
+        cmd += ["-map", "0:a:0"]
+
+    cmd += [
+        "-vn",
+        "-acodec", "pcm_s16le",
+        "-ar", "44100",
+        "-ac", "2",
+        str(tmp_path)
+    ]
+
+    subprocess.run(cmd, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL, check=True)
+    return tmp_path
+
+def find_high_power_segment(wav_path: Path, expected_length: float, confidence_threshold: float = 1.0) -> float:
+    rate, data = wavfile.read(wav_path)
+    
+    if len(data.shape) > 1:
+        data = data.mean(axis=1)
+        
+    data = data.astype(np.float32) / (np.max(np.abs(data)) + 1e-9)
+    
+    chunk_size = rate 
+    num_chunks = len(data) // chunk_size
+    
+    # Calculate RMS (Volume) and Standard Deviation (Variation) for every second
+    powers = np.zeros(num_chunks)
+    variations = np.zeros(num_chunks)
+    
+    for i in range(num_chunks):
+        chunk = data[i * chunk_size : (i + 1) * chunk_size]
+        powers[i] = np.sqrt(np.mean(chunk**2))
+        variations[i] = np.std(chunk)
+
+    window_size = int(expected_length)
+    if len(powers) < window_size:
+        raise ValueError("Audio segment too short.")
+
+    # SCORING ALGORITHM:
+    # We want High Power and Low Variation (that "solid block" look)
+    # We invert variation so that a small variation results in a higher score.
+    scores = []
+    for i in range(len(powers) - window_size + 1):
+        win_power = np.mean(powers[i : i + window_size])
+        win_var = np.mean(variations[i : i + window_size])
+        
+        # The score increases with power and decreases as the variation increases
+        # We add a small constant to win_var to avoid division by zero
+        score = win_power / (win_var + 0.05) 
+        scores.append(score)
+
+    best_idx = np.argmax(scores)
+    
+    # Confidence check: is our best score significantly better than the average score?
+    avg_score = np.mean(scores)
+    if scores[best_idx] < avg_score * confidence_threshold:
+        raise ConfidenceError("Detection unreliable: no distinct high-power constant block found.")
+        
+    return float(best_idx)
+
+def get_intro_outro(file: Path, length: float = 90.0) -> List[Tuple[float, float]]:
+    """
+    Finds the intro and outro of a video file by analyzing audio power peaks.
+    Searches the first 8 minutes and the last 8 minutes.
+    """
+    results = []
+    total_duration = get_video_duration(file)
+    search_window = 8 * 60.0  # 8 minutes
+    
+    # --- 1. FIND INTRO ---
+    intro_search_dur = min(search_window, total_duration)
+    intro_wav = extract_audio_segment_tmp(file, 0.0, intro_search_dur)
+    
+    try:
+        intro_start_rel = find_high_power_segment(intro_wav, length)
+        results.append((intro_start_rel, length))
+    except ConfidenceError:
+        intro_wav.unlink()
+        raise ConfidenceError("Could not confidently detect the Intro.")
+    finally:
+        if intro_wav.exists():
+            intro_wav.unlink() # Cleanup temp file
+            
+    # --- 2. FIND OUTRO ---
+    outro_search_start = max(0.0, total_duration - search_window)
+    outro_search_dur = total_duration - outro_search_start
+    outro_wav = extract_audio_segment_tmp(file, outro_search_start, total_duration)
+    
+    try:
+        outro_start_rel = find_high_power_segment(outro_wav, length)
+        # Add the 8-minute offset back to get the absolute timestamp in the video
+        outro_start_abs = outro_search_start + outro_start_rel
+        results.append((outro_start_abs, length))
+    except ConfidenceError:
+        outro_wav.unlink()
+        raise ConfidenceError("Could not confidently detect the Outro.")
+    finally:
+        if outro_wav.exists():
+            outro_wav.unlink() # Cleanup temp file
+
+    # Ensure we got both
+    if len(results) < 2:
+        raise MissingDetectionError("Failed to find both an intro and an outro.")
+
+    return results
+
+# --- Example Usage ---
+if __name__ == "__main__":
+    try:
+        # Requires: pip install numpy scipy
+        file_path = Path("/home/honney/mount/Media/tmp/serien/ready/Charlotte/Season 01/[NO CHAPTER]_E04.mkv")
+        if file_path.exists():
+            timestamps = get_intro_outro(file_path, length=90.0)
+            print("Found Intro and Outro [Start, Duration]:", timestamps)
+    except Exception as e:
+        print(f"Error: {e}")
\ No newline at end of file
diff --git a/test3.py b/test3.py
new file mode 100644
index 0000000..41b81ed
--- /dev/null
+++ b/test3.py
@@ -0,0 +1,81 @@
+import subprocess
+from typing import Optional, List
+from pathlib import Path
+import shutil
+
+def run(cmd: subprocess._CMD) -> subprocess.CompletedProcess[str]:
+    """
+    Run a subprocess command.
+
+    Args:
+        cmd: Command and arguments as a list.
+
+    Raises:
+        subprocess.CalledProcessError: If the command exits with a non-zero status.
+    """
+    try:
+        result = subprocess.run(
+            cmd,
+            check=True,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT,
+            text=True
+        )
+        return result
+    except subprocess.CalledProcessError as e:
+        print(e.stdout)
+        raise
+
+# def stick_together_audio(left_audio: Path, right_audio: Path, output_audio: Path) -> None:
+#     """
+#     Concatenate two audio files so that left_audio plays directly
+#     before right_audio in the output file.
+#     """
+
+#     left_audio = Path(left_audio)
+#     right_audio = Path(right_audio)
+#     output_audio = Path(output_audio)
+
+#     # Use stem instead of prefix to create a temporary file
+#     output_audio_tmp = output_audio.parent / (output_audio.stem + "_temp" + output_audio.suffix)
+
+#     run([
+#         "ffmpeg",
+#         "-y",
+#         "-i", str(left_audio),
+#         "-i", str(right_audio),
+#         "-filter_complex", "[0:a][1:a]concat=n=2:v=0:a=1[a]",
+#         "-map", "[a]",
+#         "-c:a", "opus",   # or "aac" if you prefer
+#         "-strict", "-2",
+#         str(output_audio_tmp)
+#     ])
+
+#     shutil.move(output_audio_tmp, output_audio)
+import tempfile
+
+def stick_together_audio(left_audio: Path, right_audio: Path, output_audio: Path) -> None:
+    left_audio = Path(left_audio)
+    right_audio = Path(right_audio)
+    output_audio = Path(output_audio)
+
+    with tempfile.NamedTemporaryFile("w", delete=False, suffix=".txt") as f:
+        f.write(f"file '{left_audio.resolve()}'\n")
+        f.write(f"file '{right_audio.resolve()}'\n")
+        list_file = f.name
+
+    run([
+        "ffmpeg",
+        "-y",
+        "-f", "concat",
+        "-safe", "0",
+        "-i", list_file,
+        "-c", "copy",   # no re-encode
+        str(output_audio)
+    ])
+
+file1 = Path("/home/honney/mount/Media/tmp/serien/ready/Clannad (2007) [tmdb-24835]/Season 02/Clannad Season 02 E01_german_audio.mka")
+file2 = Path("/home/honney/mount/Media/tmp/serien/ready/Clannad (2007) [tmdb-24835]/Season 02/Clannad Season 02 E01_original_audio2.mka")
+out = Path("/home/honney/mount/Media/tmp/serien/ready/Clannad (2007) [tmdb-24835]/Season 02/Clannad Season 02 E01_german_audio2.mka")
+
+stick_together_audio(file1, file2, out)
\ No newline at end of file
diff --git a/test4.py b/test4.py
new file mode 100644
index 0000000..49175ff
--- /dev/null
+++ b/test4.py
@@ -0,0 +1,33 @@
+from pathlib import Path
+import subprocess
+
+def get_audio_duration(file_path: Path):
+    """
+    Get the actual duration of the first audio stream by asking ffprobe
+    to count packets/frames if the stream metadata is missing.
+    Returns duration in seconds.
+    """
+
+    # As a last resort, use the format duration
+    result = subprocess.run([
+        "ffprobe",
+        "-v", "error",
+        "-select_streams", "a:0",
+        "-show_entries", "stream_tags=DURATION",
+        "-of", "default=noprint_wrappers=1:nokey=1",
+        file_path
+        ],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        text=True
+    )
+    result = result.stdout.strip().split(":")[::-1]
+    # if DEBUG: print(f"audio duration: {result}")
+    res = 0
+    if not result:
+        raise ValueError(f"Could not extract length")
+    for i in range(len(result)):
+        res += float(result[i])*(60**i)
+    return res
+
+printget_audio_duration(Path("/home/honney/mount/Media/tmp/serien/ready/Classroom of the Elite/Season 01/E01_original_audio2.mka"))
\ No newline at end of file
diff --git a/test5.py b/test5.py
new file mode 100644
index 0000000..977b3cf
--- /dev/null
+++ b/test5.py
@@ -0,0 +1,54 @@
+import subprocess
+import shutil
+from pathlib import Path
+
+def shift_mka(file: Path, offset: float) -> None:
+    """
+    Hard-edits an MKA file by shifting audio data.
+    Positive offset: Adds silence at start (Delay).
+    Negative offset: Trims the beginning (Advance).
+    """
+    if not file.is_file():
+        print(f"File not found: {file}")
+        return
+
+    # Create a normal file path right next to the original file
+    # If the file is "/folder/audio.mka", this becomes "/folder/shifted_audio.mka"
+    new_file = file.parent / f"shifted_{file.name}"
+    
+    # 1. Determine the filter
+    if offset > 0:
+        # Delay all channels by X milliseconds
+        ms = int(offset * 1000)
+        audio_filter = f"adelay={ms}:all=1"
+    elif offset < 0:
+        # Trim the start and reset timestamps to 0
+        audio_filter = f"atrim=start={abs(offset)},asetpts=PTS-STARTPTS"
+    else:
+        print("Offset is 0, no shift needed.")
+        return
+
+    # 2. Execute FFmpeg
+    cmd = [
+        "ffmpeg", "-y",
+        "-i", str(file),
+        "-af", audio_filter,
+        "-c:a", "libopus", 
+        str(new_file)
+    ]
+
+    print(f"Processing shift: {offset}s...")
+    
+    result = subprocess.run(cmd, capture_output=True, text=True)
+
+    if result.returncode == 0:
+        # Move the new file over the original file (overwriting it)
+        shutil.move(str(new_file), str(file))
+        print(f"Successfully updated: {file.name}")
+    else:
+        print(f"FFmpeg Error:\n{result.stderr}")
+        # Clean up the leftover file if the process failed
+        if new_file.exists():
+            new_file.unlink()
+
+shift_mka(Path("/home/honney/mount/Media/tmp/serien/ready/Classroom of the Elite/Season 01/E01_german_audio.mka"), 0.9592916666666667)
\ No newline at end of file