Devede passes -b:v to avconv, but this does not override
default video bitrate comming from -target option.
This easily results in output that does not fit selected media capacity,
"Adjust disc usage" having no effect.
Devede should pass -b to avconv.
Maybe this is bug in avconv, not respecting -b:v when -target given,
but if I remember devede passes -b to ffmpeg if used, so this
is at least inconsistency.
A patch is available here:
Correctly pass bitrate to avconv (closes #24)
Use -b <bitrate> which overrides default values comming from -target
option, rather than -b:v <bitrate> which does not.