High quality screen capture with avconv
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avconv -f x11grab -r 25 -s 1280x720 -i :0.0+0,0 -vcodec libx264 -pre lossless_ultrafast -threads 0 video.mkv
Presets are now called .avpreset
When capturing with audio, we need to specify stream ID for the -pre option:
avconv -f alsa -i pulse -f x11grab -r 25 -s 1280x720 -i :0.0+0,0 -acodec libfaac -vcodec libx264 -pre:0 lossless_ultrafast -threads 0 video.mkv
Note that on Mint 13 -acodec pcm_s16le gives trouble in MKV container.
Use -pre:0 lossless_slow when converting to .mov format.
If having problems with -acodec libfaac try omitting acodec altogether. It will then use libvorbis which is fine (just not lossless).