[FFmpeg-user] Picture jerky when screencasting?

[lugoteehalt]

Etienne Buira wrote:
> 
> On Thu, Jun 02, 2011 at 09:34:14AM -0700, lugoteehalt wrote:
>> 
>> Etienne Buira wrote:
>> > 
>> > 
>> >> > http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>> >> > 
>> >> 
>> >> Thanks.  Completely new to ffmpeg, bit mystified.  Is this at all
>> >> helpful?
>> > 
>> > Hi
>> > 
>> >> ffmpeg -f alsa -ac 2 -i pulse -f x11grab -s `xdpyinfo | grep
>> >> 'dimensions:'|
>> >> awk '{print $2}'` -r 25 -i :0.0 -fpre
>> >> /usr/local/share/ffmpeg/libx264-lossless_ultrafast.ffpreset -sameq
>> >> out.mpg
>> >> Output #0, mpeg, to 'out.mpg':
>> >>     Stream #0.0: Video: mpeg1video, yuv420p, 1360x768, q=0-69, pass 1,
>> >> pass
>> >> 2, 200 kb/s, 90k tbn, 25 tbc
>> > 
>> > Your preset file contains well more things than it should, please use
>> an
>> > unmodified one. (deleting it, reinstalling, comparing with the one
>> > checked out in your tree or whatever).
>> Thanks.  Compiled ffmpeg myself:
> ../..
> 
> So, is your /usr/local/share/ffmpeg/libx264-lossless_ultrafast.ffpreset
> an exact copy of the original preset (that you can find in your git tree
> or here:
> http://git.videolan.org/?p=ffmpeg.git;a=blob_plain;f=ffpresets/libx264-lossless_ultrafast.ffpreset;hb=HEAD)?
> If not an exact copy, make it one.
> If you still have same trouble after that, check that the loaded preset
> is actually the one you think (strace can help).
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> Great thanks.  Seems to be an exact copy.  It now works with:

ffmpeg -f alsa -ac 2 -i pulse -f x11grab -s cif -r 25 -s `xdpyinfo | grep
'dimensions:'| awk '{print $2}'` -fpre
/usr/local/share/ffmpeg/libx264-lossless_ultrafast.ffpreset -i :0.0
~/out.mkv

The picture no longer jerks on iplayer fullscreen, nor is it much webcammy. 
But the quality, while acceptable for most things, is not high.  Colour
gradients are stepped for instance.  Hope this not off topic but could you
suggest how to tweek the quality - it is a complex piece of software for
someone new?



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