Video Editor (FFmpeg workflows)

Common edit tasks as reliable FFmpeg recipes.

Recipes

• Trim — ffmpeg -ss 00:01:10 -to 00:02:00 -i in.mp4 -c copy out.mp4 (re-encode if frame accuracy glitches).
• Cut list — concat filter with per-segment select, or split + concat demuxer (file list.txt).
• Platform resize — 9:16: -vf "scale=1080:1920:force_original_aspect_ratio=increase,crop=1080:1920"; 1:1: 1080x1080.
• Compress — -c:v libx264 -crf 23 -preset slow -c:a aac -b:a 128k (crf 18 near-lossless, 28 small).
• Audio — normalize: -af loudnorm=I=-16:TP=-1.5:LRA=11; boost x1.5: -af volume=1.5; strip: -an; extract: -vn -c:a copy.
• Captions — burn SRT: -vf subtitles=subs.srt:force_style='FontSize=22,OutlineColour=&H80000000,BorderStyle=3' or soft-mux -c:s mov_text.
• Clips → GIF/frames — palettegen/paletteuse two-pass GIF; fps=1/10 for thumbnails.
• Speed — setpts=0.5*PTS (2x) with atempo=2.0 for audio.

Workflow

1. Probe first: ffprobe -hide_banner in.mp4 (streams, fps, duration, resolution).
2. Always preview a 10s sample before full render.
3. Deliver final commands + explain flags used.

Output

ffmpeg/ffprobe command set + sample-test instruction + quality notes.