[mythtvnz] H264 Performance - Patch to enable skip loop filtering and use 2 threads.

[Andrew Richards]

I am trying to setup my 5200 X2 to play TV3 and have a couple of questions
about these settings:

1) Where is 'libs/libmythtv/avformatdecoder.cpp'? I have a /lib (which has
no libmythtv folder) but not /libs. I am using Mythbuntu if it is important.
As noted below I think i have this skipping and would like to fix it.

2) What exactly are others running for playback profiles? I have tried a
couple, have currently set it to 'Slim' but with max CPU's set to 2 for all
for entry's. For all I get around 50%-70% CPU on TV3 but with the freezing
every 2secs or so. I assume this is the skipping the quoted fix is for.

All the other channels work, it is just TV3 I need to sort out.

Cheers

Andrew

On Mon, Aug 18, 2008 at 4:46 PM, Paul Kendall <paul at kcbbs.gen.nz> wrote:

> On Sunday 17 August 2008 20:11:52 Mike Russell wrote:
> > Hi
> >
> > I am using the MythTV source from http://pkendall.homeip.net/.
> Everything
> > worked great, except I got skipping on TV3 (Opteron 2.5ghz dual core).
> > Using skiploopfilter and 2 threads on Mplayer sped things up enough to
> > prevent the skipping.  Couldnt find how to set the same options in
> mythtv,
> > So investigated it myself and found how to get the equivilant in MythTV.
> > Would be good if this sort of thing could be configured in Myth.
> >
> > Thought this may be of help for some people that are having trouble with
> > skipping.
> >
> > libs/libmythtv/avformatdecoder.cpp about line 1589.
> >
> >                 video_codec_id = kCodec_MPEG2; // default to MPEG2
> >                 }
> >
> >        +         if (CODEC_ID_H264 == enc->codec_id)
> >        +        {
> >        +           VERBOSE(VB_PLAYBACK, LOC + "Turning off loop filter");
> >        +             enc->skip_loop_filter = AVDISCARD_ALL;
> >        +             VERBOSE(VB_PLAYBACK, LOC + "Setting the thread count
> > to 2");
> >        +             enc->thread_count = 2;
> >        +         }
> >
> >                 if (enc->codec)
> >                 {
> >
> > Regards
>
> Doing the skip loop filter is good, but changing the thread should be done
> in
> the playback profiles screens. Where you select the de-interlacers you can
> specify the number of CPUs.
>
> Cheers,
> Paul
>
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