[FFmpeg-user] Picture jerky when screencasting?

[Etienne Buira]

On Thu, Jun 02, 2011 at 02:28:37PM +0200, belcampo wrote:
> On 06/02/11 00:25, lugoteehalt wrote:
> >
> > belcampo wrote:
> >>
> >>
> >> I don't know what ultimately your intention is, but you're playing
> >> iplayer, which is 25fps, so grabbing at -r 30, isn't .... AFAIK
> >> You've choosen lossles which results in 1002700kb/s which is an awfull
> >> lot of data to process.
> >> Your system also has to decode and display the iplayer stuff, don't know
> >> how taxing that is on your system, but all in all I think it's way too
> >> much for any system. I'm not 100% sure though.
> To place some things in perspective:
> You've choosen lossles which results in 1002700kb/s which is an awfull
> lot of data to process.

That's the input rate, before compression.
With a single threaded h264 decoding/x264 lossless_ultrafast encoding,
my host reaches 15~17fps. Going multithreaded it should be manageable to
do 25/30 fps on multicore decent box.