I'm converting mov (or flv or mp4) files into ogv. Unfortunately, the programs I've been using (Miro, FFMPEG's ogv plugin) have terrible encoding that appears extremely fuzzy. Does anyone have recommendations for less compressed files in this format? Is it possible? Software recommendations? Thanks.
You can encode to Theora video and Vorbis audio with
ffmpeg if it has been compiled with
--enable-libvorbis. Depending on your
ffmpeg version the default settings may not provide good enough quality. Therefore you must add some additional parameters to enable a constant quality type of mode for the video.
Adjust video quality with the
-qscale:v (or the alias
-q:v) option. The valid range to set video quality with libtheora is -1 to 10. A higher value is a higher quality.
Note: More modern alternatives such as VP8 can provide better quality at lower bitrates. See the FFmpeg: VP8 in WebM Encoding Guide for more info.
Adjust audio quality with the
-qscale:a (or the alias
-q:a) option for VBR audio. The valid range to set audio quality with libvorbis is 0 to 10. A higher value is higher quality. See the Recommended Vorbis Encoder Settings to get an idea of what values to use. The default of
-q:a 3 will be used if you omit
ffmpeg supports two Vorbis encoders: the external library libtheora (
-c:a libvorbis) and the native Vorbis encoder (
-c:a vorbis -strict experimental). The native encoder is experimental, does not compare well to libvorbis, and usage is not recommended.
The following command will create a good quality output for both video and audio:
ffmpeg -i input -c:v libtheora -c:a libvorbis -q:v 6 -q:a 5 output.ogg
Make sure to always use a recent
ffmpeg build and refer to the current documentation specific to your build since options can change. See the FFmpeg download page for various ways to acquire
ffmpeg or follow one of the FFmpeg compile guides.