Convert, resize, compress, and trim video and audio files with FFmpeg commands.
npx skills add https://github.com/mooch10/mochiptos --skill ffmpeg-mooch10
Please help me install this Agent Skill. Skill: ffmpeg Source: https://github.com/mooch10/mochiptos/tree/main/frontend/.agents/ffmpeg Command: npx skills add https://github.com/mooch10/mochiptos --skill ffmpeg-mooch10
High-intent search queries and answers about installing and using this skill.
Use ffmpeg with -movflags faststart, -pix_fmt yuv420p, and a scale filter forcing even dimensions: scale=trunc(iw/2)*2:trunc(ih/2)*2. This produces an H.264-compatible MP4 that streams in browsers and works with Remotion.
Use filter_complex combining setpts for video and atempo for audio, for example setpts=0.5*PTS with atempo=2.0 for 2x speed. For speeds above 2x, chain multiple atempo filters since each is limited to the 0.5-2.0 range.
Use FFmpeg for extreme speeds above 4x or below 0.25x, variable speed changes over time, or when perfect audio sync is required. Remotion playbackRate only supports constant speed and evaluates frames independently.
The H.264 codec requires even dimensions, so odd-width or odd-height sources fail. Fix it by adding a scale filter that truncates to even values: scale=trunc(iw/2)*2:trunc(ih/2)*2.
CRF 18 suits archive masters, 20-22 fits production use, 23 is the default for general delivery, and 28 or higher works for quick drafts. Lower CRF means better quality and larger files.
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