[MEncoder-users] Performance on multi core machines - a specific enquiry re avisynth mt input

[Michael Rozdoba]

Michael Rozdoba wrote:

> See http://forum.doom9.org/showthread.php?p=1050284#post1050284
> 
> We now have an explanation. Due to the way MEncoder invokes the script, 
> MT isn't adding the Distributor to the end of the script. If one appends 
> a manual call to Distributor() as the last line, MT functions as 
> intended & the decoding of MEncoder's avisynth input is then 
> multithreaded :)
> 
> Hopefully we'll see a proper fix for this - preferably within 
> AVISynth/MT

Apparently not easily done as there's no way for avisynth to know when 
the script is complete... And it does need to be fixed as the manual 
hack of adding the Distributor call to the script end causes problems 
when the script is invoked in the usual way by other apps (duplicate 
Distributor calls cause too many threads to be put into use & poorer 
performance results).

> but failing that MEncoder could always be patched to detect 
> MT in use & append the Distributor call itself.

This seems to be the way to go.

I've written a patch which might fix the issue & have run it past the 
avisynth/mt devs on the above thread. Before posting it (is it okay to 
submit here?), I wanted to build MPlayer to test this myself.

However I'm having some basic problems, mostly as I'm not familiar with 
the required tools & environment. I don't want to clutter dev list/s 
with newbie build queries, so hopefully it'll be okay to ask here. I'll 
start a new thread in a moment. Please tell me to post elsewhere if more 
appropriate. Cheers.

-- 
Michael Rozdoba