[mythtv] Funky 720p playback

[Bill Cizek]

>
> Robert Kulagowski wrote:
>> Keith Cremer wrote:
>>  
>>> On Mar 2, 2008, at 1:20 PM, Bill Cizek wrote:
>>>
>>>    
>>>>> AFAICT this WLSDT is not broadcasting broken streams, they are 
>>>>> just  using
>>>>> an encoding extension we don't support very well. These streams 
>>>>> do  in fact
>>>>> play on powerful MythTV machines. I believe they are broadcasting  
>>>>> about 40
>>>>> fps on a 60fps stream and marking some of the frames as 
>>>>> repeatable,  but I
>>>>> haven't added the debugging statements to MythTV to confirm this.  
>>>>> If true,
>>>>> MythTV doesn't know what is going on and so the only way it 
>>>>> adjusts  is with
>>>>> the A/V sync code. This works, but is CPU intensive.
>>>>>
>>>>> -- Daniel
>>>>>
>>>>>         
>>>> I've got a 3.2 GHz P4 and it plays,  it's just funky - kind of 
>>>> like  you
>>>> describe above.
>>>>
>>>> Are you referring to the top_field_first and repeat_first_field flags?
>>>>
>>>> I checked my problem recordings and these flags are set within them.
>>>>
>>>> Recordings where they're unset play fine.
>>>>
>>>> If there's anything I can do to help fix / test this let me know.
>>>>
>>>> -Bill       
>>> Mine are playing back on a high end Core 2 with plenty of power to  
>>> spare.  I'll do some test captures using the HDHomeRun and VLC to 
>>> see  if the stream is intact, and then look at the playback in Myth.
>>>     
>>
>> On a 2.8Ghz P4, it's pretty much unwatchable; the audio and video get 
>> separated by 3-5 seconds.  (But 720p from Fox is OK and works AFAICT).
>>   
> I'm not sure if I'm experiencing the same issue.  My 720p content is 
> coming from my STB over firewire, not a HD HomeRun.  1080i 
> mpeg2content is fine, as is 720p/1080p H264, only 720p mpeg2 content 
> seems to be the issue.  I'm running a core 2 duo @ 2.9Ghz, so I think 
> I've got all kinds of cpu power.  I opened ticket #4859 with logs and 
> a sample.  Mplayer has no problem playing the file.
>
> Brad
>

I checked your file, Brad and it plays fine on my system (P4 3.2 GHz,
NFS frontend with SPDIF output)

Since you have a dual core cpu you might want to enable multithreaded
decoding.  From the looks of your logs you aren't using it.  That might 
help.

 Also, if this is a new system you might need to tune NFS, mysql and your
network.  It's been a while but I remember having to tweak a lot of stuff to
get things working well.

I opened #4867 for this problem.  I also noticed that xine plays these
recordings ok (including Lost from last week).

-Bill