fix: removed some errors and made sure that same filenames but different files do not break

config.toml

@@ -5,6 +5,9 @@
 # Input files — relative to repo root or absolute. Same as extract.py inputs.
 file_a = "/home/honney/Videos/Drachenzähmen/Drachenzaehmen.mp4"
 file_b = "/home/honney/Videos/Drachenzähmen/How to Train Your Dragon.mkv"
+# Output stem names (without extension). If omitted, derived from input filename.
+stem_a = "file_a"
+stem_b = "file_b"
 # Window to extract (seconds). This is the ONLY duration needed.
 duration = 30
 # Start offset in file (seconds, 0 = file start). ffmpeg -ss before -i for fast seek.