[Kdenlive-devel] How to enable multi-cpu usage in rendering...

[Stéphane Téletchéa]

----- "Dan Dennedy" <dan at dennedy.org> a écrit :

> On Tue, Mar 3, 2009 at 6:59 AM, Stéphane Téletchéa <steletch at free.fr>
> wrote:
> > Since i have home a dual core cpu and inigo runs with two threads, i
> assumed there was an auto-detection, but since i have here 2*4 cpus, i
> would like to benchmark the rendering (in 64 bits mode). So far i have
> not found how to do it in settings, the mailing list and the web site,
> is it possible atm?
> >
> 
> The launcher script from the Builder Wizard detects #cpus and sets an
> environment variable MLT_AVFORMAT_THREADS=n. You can also set
> threads=n as a property in a render profile. This thread count is not
> the overall thread count. It is the number of FFmpeg worker threads
> for video encoding (and decoding if using MLT_AVFORMAT_THREADS).
> Therefore, you might want to set this to #core -1 or -2. Also, it
> only
> works for some codecs; it works exceptionally well for x264.
> 

Thanks, i've tried with xvid and the workload is not as important as i've seen with other programs, but i'll try the x264 codec...