ffmpeg-media-recipeslisted

# FFmpeg Media Recipes ## Cutting and Assembly Extract a segment by timestamp (stream copy, no re-encode; cuts snap to keyframes): ```bash ffmpeg -i raw.mp4 -ss 00:12:30 -to 00:15:45 -c copy segment_01.mp4 ``` Batch cut from an edit decision list (`cuts.txt` lines: `start,end,label`): ```bash while IFS=, read -r start end label; do ffmpeg -i raw.mp4 -ss "$start" -to "$end" -c copy "segments/${label}.mp4" done < cuts.txt ``` Concatenate segments (same codec/params required for `-c copy`): ```bash for f in segments/*.mp4; do echo "file '$f'"; done > concat.txt ffmpeg -f concat -safe 0 -i concat.txt -c copy assembled.mp4 ``` ## Preprocessing Proxy for faster editing: ```bash ffmpeg -i raw.mp4 -vf "scale=960:-2" -c:v libx264 -preset ultrafast -crf 28 proxy.mp4 ``` Extract audio for transcription (16 kHz mono-friendly PCM): ```bash ffmpeg -i raw.mp4 -vn -acodec pcm_s16le -ar 16000 audio.wav ``` Loudness normalization (EBU R128; `I` target integrated loudness in LUFS, `TP` true peak in dBTP, `LRA` loudness range): ```bash ffmpeg -i segment.mp4 -af loudnorm=I=-16:TP=-1.5:LRA=11 -c:v copy normalized.mp4 ``` `I=-16` suits spoken-word/podcast delivery; streaming platforms commonly target -14. ## Aspect-Ratio Reframing | Platform | Aspect | Resolution | |----------|--------|------------| | YouTube | 16:9 | 1920x1080 | | TikTok / Reels / Shorts | 9:16 | 1080x1920 | | Instagram feed | 1:1 | 1080x1080 | | X / Twitter | 16:9 or 1:1 | 1280x720 or 720x720 | Center crops (c