[mythtv-users] HD-PVR Audio Sync Issues After Channel Change

Alan Young ayoung at teleport.com
Mon Apr 12 22:56:41 UTC 2010


On 04/12/2010 03:47 PM, Kevin Ross wrote:
>> My HD-PVR pretty much works wonderfully until I change the channel, at
>> which point the audio goes way out of sync. I'm running latest svn and
>> have tried various versions of the firmware to no avail.
>>
>> I'm changing channel via firewire on an SA3250 using sa4250_ch - I
>> couldn't get the 3250 to work properly. There's no significant errors
>> on front or backend, so I'm not entirely sure where to look.
>>
>> Could it be an issue with the channel change script (I don't see how)
>> or is there something else that could be the culprit.
>>
>> Thanks!
>
> In my experience, Live TV isn't usable with an HD-PVR until you apply the
> patches listed in the wiki.  Adding a few seconds to the channel change
> script helps, but it isn't perfect.  Adding a delay isn't necessary with the
> patches (in my experience).

The patches in the wiki are a band-aid.  They stop and restart the recorder 
after the channel change.  It flushes the HDPVR buffers of data and any 
pending data on the PC.  That's why back to back recordings end up missing 
several seconds.

Alan


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