Xenial Xerus has a decent version of ffmpeg2theora:
andrew@athens:~$ ffmpeg2theora | head -n 6
ffmpeg2theora 0.29
Xiph.Org libtheora 1.1 20090822 (Thusnelda)
Xiph.Org libVorbis 1.3.5
FFmpeg libavcodec 56.60.100
FFmpeg libavformat 56.40.101
andrew@athens:~$
But the command options for this application are still a little difficult, particularly when you move beyond these basic video and audio settings:
-v, --videoquality [0 to 10] encoding quality for video (default: 6)
use higher values for better quality
-V, --videobitrate encoding bitrate for video (kb/s)
-a, --audioquality [-2 to 10] encoding quality for audio (default: 1)
use higher values for better quality
-A, --audiobitrate [32 to 500] encoding bitrate for audio (kb/s)
What is a command line to produce great, free video clips that takes advantage of all of the ffmpeg2theora command line possibilities?
Note:
To escape the possibility of this question being deemed: 'Too Broad' or 'Opinion Based' I have placed a sample file here for testing:
wget http://www.andrews-corner.org/samples/matrix_sparring_h10.mkv
Command lines based on this input file would be very welcome...