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ffmpeg [2023/03/24 17:43] – [Converting] fixed busted example flac to mp3 rjtffmpeg [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>
  
-Fuck-off those .WEBMs:+Fuck-off those .WEBMs. ''copy'' here copies those streams, so they're no reencoded, it's just changing the container:
  
 <code>ffmpeg -i [input].webm -acodec copy -vcodec copy [output].mkv</code> <code>ffmpeg -i [input].webm -acodec copy -vcodec copy [output].mkv</code>
 +
 +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)…:
 +
 +<code>ffmpeg -i [input].webm -c copy [output].mkv</code>
 +
 +So if you wanted to copy the video stream and just reencode/change the audio, for example:
 +
 +<code>ffmpeg -i [input].[ext] -acodec aac -vcodec copy [output].[ext]</code>
  
 === Multiple === === Multiple ===
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 <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>
  
-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:
  
 <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>
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 === Rotation === === Rotation ===
-Rotate 90°.+Rotate 90°. This will reencode the video.
  
 <code>ffmpeg -i inputfile.ext -vf "transpose=1" outputfile.ext</code> <code>ffmpeg -i inputfile.ext -vf "transpose=1" outputfile.ext</code>
 +
 +To rotate -90° is ''transpose=2''.
 +
 +(The easiest, tidiest way to rotate a phone video is to just edit the metadata with [[exiftool]])
  
 === Trimming === === Trimming ===
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 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>
 +
 +===== Frontends =====
 +
 +  * [[https://ffmpeg.lav.io/|FFmpeg Explorer]] - Browser-based GUI with a node-based interface for changing parameters.
  
 ===== See Also ===== ===== See Also =====
ffmpeg.1679640234.txt.gz · Last modified: 2023/03/24 17:43 by rjt