Rotate a video with FFmpeg, no re-encoding
· 4 min read
Using -display_rotation with -c copy to write MP4 rotation metadata, and why the older -metadata:s:v rotate=N recipe silently does nothing now.
Tag: ffmpeg
7 posts
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ffmpeg trim video
· 5 min readHow to cut a clip out of a video with FFmpeg — frame-accurate vs fast and lossless, where to put -ss, and why -c copy sometimes lands seconds off.
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ffmpeg crop video
· 8 min readHow to crop video with ffmpeg — the crop filter, cropdetect for black bars, and the real gotchas.
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FFmpeg for Audacity: which build works, and how to fix 'library not found'
· 6 min readAudacity needs FFmpeg installed separately as a shared library. Here's the right build per OS, and the fix when it says 'library not found'.
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Bypassing YouTube's SABR streaming when FFmpeg can't help
· 4 min readYouTube's SABR protocol blocks FFmpeg from downloading affected formats. The fix isn't in FFmpeg — it's in yt-dlp client switching, PO Tokens, or a fork.
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ffmpeg -t vs -to: duration vs end position when encoding
· 4 min readWhich FFmpeg option stops where, why -t wins when both are present, and why -ss A -i in -to B doesn't give you a B-A clip.
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Examples of FFmpeg's non-local means noise reduction filter
· 14 min readFour working FFmpeg nlmeans command lines for grainy video — each parameter explained, plus a tuning that runs 21× faster than the defaults.