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

[Andrew Richards]

Sorry what source are you refering to? I have your patches applied from 
your repository already, that part is working fine.

Paul Kendall wrote:
> On Saturday 23 August 2008 12:11:19 Andrew Richards wrote:
>   
>> 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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>>>       
>
> You need the source, then apply the patch and rebuild mythtv.
>
> Cheers,
> Paul
>
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