fix: correctly fixed same basename issue

config.toml

@@ -5,9 +5,6 @@
 # Input files — relative to repo root or absolute. Same as extract.py inputs.
 file_a = "/path/to/movie_b.mp4"
 file_b = "/path/to/movie_a.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.