wiki:

TheoraVorbisEncodingGuide


Version 2 (modified by llogan, 3 years ago) (diff)

fix incorrect stream type

Theora and Vorbis Encoding Guide

The Theora video format, Vorbis audio format, and Ogg container format were developed by Xiph.org as free and open-source media formats. FFmpeg can create these formats by using the external encoding libraries libtheora and libvorbis.

To use these encoders make sure your ffmpeg build has been compiled with --enable-libtheora --enable-libvorbis or see the output of ffmpeg -codecs. If you want to compile ffmpeg to support these encoders see the various FFmpeg Compilation Guides for detailed instructions.

libvorbis is usually recommended over the experimental, native FFmpeg Vorbis audio encoder (-codec:a vorbis -strict experimental) since it does not provide comparable quality to libvorbis.

Variable Bitrate (VBR)

ffmpeg -i input.mkv -codec:v libtheora -qscale:v 7 -codec:a libvorbis -qscale:a 5 output.ogv
  • -qscale:v – video quality. Range is 0–10, where 10 is highest quality. 5–7 is a good range to try. If you omit -qscale:v (or the alias -q:v) then ffmpeg will use the default -b:v 200k which will most likely provide a poor quality output.
  • -qscale:a – audio quality. Range is 0–10, where 10 is highest quality. 3–6 is a good range to try. Default is -qscale:a 3.

Note: if you omit -codec:a libvorbis then ffmpeg will default to the native FFmpeg flac audio encoder for ogg/ogv output container.

Other Resources