Added tests and more

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)