[mythtv-users] Audio Sync Issues with HD-PVR.

Nick Rout nick.rout at gmail.com
Thu Oct 20 21:44:17 UTC 2011

On Thu, Oct 20, 2011 at 9:47 AM, Roger Horner <roger1818 at yahoo.com> wrote:
>>>It sounds like it's the HD-PVR producing busted timestamps so I don't know
>>> how we can help that. Maybe a
>>>future firmware/driver update will >help.
>>Any theory to why it would only occur on HD/SD switchovers?
>>(The issue doesn’t appear when recording with the software provided for
>> windows as far as I can tell)
> I am not an expert, but my guess is the HD-PVR is receiving separate clocks
> for digital audio and analog video.  When the station changes resolution
> during the commercial break, it needs to re-sync the video clock (creating a
> small delay), but there is no change to the audio clock.  I am guessing the
> Windows driver forces the audio to re-sync when the video re-syncs, to keep
> things aligned.

This thread rang a bell, there were some issues at one stage re the
difference between 60fps and 59.94fps

This thread is an example
http://www.gossamer-threads.com/lists/mythtv/users/441028#441028 but i
am sure there is a more detailed discussion in the archives somewhere.

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