[mythtv] [mythtv-commits] Ticket #6986: max CPUs setting for Multithreading ffmpeg h264 has no affect.

Janne Grunau janne-mythtv at grunau.be
Sun Sep 6 09:32:26 UTC 2009

On Sun, Sep 06, 2009 at 09:37:46AM +0100, John wrote:
> >   
> Trawling through the archives I found an old post of mine 
> http://www.gossamer-threads.com/lists/mythtv/dev/296619#296619 which 
> suggests that multi-core and BBC-HD worked together at one point.

Yes and a couple of other broadcast too, unfortunately encoding
parameters have changed.

> To be crystal clear, without turning of the loop filter, will some H264 
> content be multi thread decoded,

Currently the multithreaded decoding works only if the frame is coded in
multiple slices and the loop deblocking filter has to be disabled across
slice boundaries (or entirely). please note this are settings in the

> or is turning of the loop filter a 
> pre-requisite to multi threading for any content ?

Disabling the loop filter manually enables multithreaded decoding only
if the loop filter is also enabled across slice boundaries.

for details.


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