[mythtv] Funky 720p playback

Robert Kulagowski rkulagow at gmail.com
Mon Mar 3 20:13:46 UTC 2008


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).



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