ffmpeg -i episode.mkv -ss 00:42:13 -frames:v 1 frame_42_13.png For a (filter by average luminance > 0.3):
ffmpeg -i episode.mkv -vf "drawtext=text='%pts\:hms':x=10:y=10:fontsize=24:fontcolor=white:box=1" -c:a copy timestamped_output.mkv Save as analyze_yj.sh : yellowjackets s03e02 ffmpeg
# First segment ffmpeg -i episode.mkv -t 00:10:23 -c copy part1.mkv ffmpeg -i episode.mkv -ss 00:10:24 -to 00:25:47 -c copy wilderness_flashback.mkv ffmpeg -i episode
ffmpeg -i episode.mkv -vf "select='gte(scene,0.4)*gt(lum,0.3)',setpts=N/FRAME_RATE/TB" -vsync 0 wilderness_shots_%04d.png Scene threshold 0.4 detects cuts; luminance >0.3 excludes dark interiors. In S03E02, background whispers are often phase-inverted or in the LFE/surround channels. Extract rear channels only (5.1 → stereo rear mix): ffmpeg -i episode.mkv -filter_complex "[0:a:0]pan=stereo|FL=FC+BL|FR=FC+BR[a]" -map "[a]" rear_mix.wav Reverse audio (common hidden message technique): ffmpeg -i rear_mix.wav -af "areverse" reversed_whispers.wav Spectrogram generation (visualize hidden tones): ffmpeg -i rear_mix.wav -lavfi showspectrumpic=s=1920x1080 spectrogram.png Look for vertical lines (tonal messages) or gaps (morse code). 6. Subtitle Extraction & Timeline Alignment Extract forced (only non-English) subtitles: Some WEB-DLs are HLG or PQ
ffmpeg -i episode.mkv -itsoffset 0.250 -i episode.mkv -map 0:v -map 1:a -c copy fixed.mkv This shifts audio by 250ms. Adjust based on your file. Some WEB-DLs are HLG or PQ. Convert to SDR for non-HDR screens: