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| ffmpeg [2022/09/04 03:30] – WEBMs rjt | ffmpeg [2025/07/22 01:10] (current) – [Editing] Rotation rjt |
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| <code>ffmpeg -i [input].mp3 -c:a libvorbis -q:a 4 [output].ogg</code> | <code>ffmpeg -i [input].mp3 -c:a libvorbis -q:a 4 [output].ogg</code> |
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| Fuck-off those .WEBMs: | Fuck-off those .WEBMs. ''copy'' here copies those streams, so they're no reencoded, it's just changing the container: |
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| <code>ffmpeg -i [input].webm -acodec copy -vcodec copy [output].mkv</code> | <code>ffmpeg -i [input].webm -acodec copy -vcodec copy [output].mkv</code> |
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| | A more compact way is to use ''-c'', which will copy over all streams (there's also ''-c:a'' (audio) ''-c:v'' (video) ''-c:s'' (subtitles)…: |
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| | <code>ffmpeg -i [input].webm -c copy [output].mkv</code> |
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| | So if you wanted to copy the video stream and just reencode/change the audio, for example: |
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| | <code>ffmpeg -i [input].[ext] -acodec aac -vcodec copy [output].[ext]</code> |
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| === Multiple === | === Multiple === |
| <code>for i in *.mp3; do ffmpeg -i "$i" -c:a libvorbis -q:a 4 -map a "${i%.*}.ogg"; done</code> | <code>for i in *.mp3; do ffmpeg -i "$i" -c:a libvorbis -q:a 4 -map a "${i%.*}.ogg"; done</code> |
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| You can use the wildcard ''*'' in the file extension to, so if you've got a mix of .mkv and .mp4 files from Youtube you can do. say: | You can use the wildcard ''*'' in the file extension too, so if you've got a mix of .mkv and .mp4 files from Youtube you can do. say: |
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| <code>for i in *.m*; do ffmpeg -i "$i" "${i%.*}.ogv"; done</code> | <code>for i in *.m*; do ffmpeg -i "$i" "${i%.*}.ogv"; done</code> |
| <code>for i in *.[ext]; do ffmpeg -i "$i" "directory/${i%.*}.[ext]"; done</code> | <code>for i in *.[ext]; do ffmpeg -i "$i" "directory/${i%.*}.[ext]"; done</code> |
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| For converting a directory of .FLAC files to .MP3. ''[-qscale:a 0|-b:a 320k]'' is your choice between VBR with the best quality (0) or a CBR of 320k. VBR is generally just as good, though sometimes you need CBR. | For converting a directory of .FLAC files to .MP3. ''[-q:a 0|-b:a 320k]'' is your choice between VBR with the best quality (0) or a CBR of 320k. VBR is generally just as good, though sometimes you need CBR. |
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| <code>for a in ./*.flac; do ffmpeg -i "$a" [-qscale:a 0|-b:a 320k] "${a[@]/%flac/mp3}"; done</code> | <code>for i in *.flac; do ffmpeg -i "$i" [-q:a 0|-b:a 320k] "${i%*}.mp3"; done</code> |
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| ==== Editing ==== | ==== Editing ==== |
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| === Rotation === | === Rotation === |
| Rotate 90°. | Rotate 90°. This will reencode the video. |
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| <code>ffmpeg -i inputfile.ext -vf "transpose=1" outputfile.ext</code> | <code>ffmpeg -i inputfile.ext -vf "transpose=1" outputfile.ext</code> |
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| | To rotate -90° is ''transpose=2''. |
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| | (The easiest, tidiest way to rotate a phone video is to just edit the metadata with [[exiftool]]) |
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| === Trimming === | === Trimming === |
| Just had an .AVI file throwing error messages about a busted index. Copying the file seemed to fix it. | Just had an .AVI file throwing error messages about a busted index. Copying the file seemed to fix it. |
| <code>ffmpeg -i "inputfile.avi" -c:v copy -c:a copy "outputfile.avi"</code> | <code>ffmpeg -i "inputfile.avi" -c:v copy -c:a copy "outputfile.avi"</code> |
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| | ===== Frontends ===== |
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| | * [[https://ffmpeg.lav.io/|FFmpeg Explorer]] - Browser-based GUI with a node-based interface for changing parameters. |
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| ===== See Also ===== | ===== See Also ===== |
