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

[Dan Dennedy]

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.

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