====== FFmpeg ======

===== Guide =====

[[https://wiki.fiveyellowmice.com/wiki/%E5%A6%82%E4%BD%95%E4%BD%BF%E7%94%A8_FFmpeg_%E8%BF%9B%E8%A1%8C%E8%A7%86%E9%A2%91%E8%BD%AC%E7%A0%81:%E9%A6%96%E9%A1%B5|如何使用 FFmpeg 进行视频转码]]

[[https://trac.ffmpeg.org/wiki/Encode/H.264|FFmpeg and H.264 Encoding Guide]]

===== Snippet =====

Convert ''mp4'' to ''gif''[(cite:>[[http://xatierlike.blogspot.com/2015/02/convert-video-to-gif-with-ffmpeg.html|Convert video to gif with ffmpeg]])]:

  ffmpeg -i input.mkv -vf scale=1024:-1 -t 20 -r 20 output.gif

Convert ''mp3'' to ''ogg''[(cite:>[[https://superuser.com/questions/273797/convert-mp3-to-ogg-vorbis|convert mp3 to ogg vorbis]])]

  ffmpeg -i input.mp3 -c:a libvorbis -q:a 4 output.ogg

Clip video [(cite:>[[https://blog.csdn.net/matrix_laboratory/article/details/53157383|ffmpeg视频精准剪切]])] [(cite:>[[https://trac.ffmpeg.org/wiki/Seeking|ffmpeg wiki: Seeking]])]:

  ffmpeg -ss [start-time] -accurate_seek  -i [input-file] -to [end-time] -c:v copy -c:a copy -avoid_negative_ts 1 [output-file]