[mythtv-users] 720p HD content from WPVI in Philly periodic a/v sync issues

Byron Poland wpoland at gmail.com
Wed Dec 16 02:07:09 UTC 2009

On Tue, Dec 15, 2009 at 7:12 PM, Taylor Ralph <tralph11 at yahoo.com> wrote:
>> Thanks for all your testing. I checked youf logs and it
>> does look better. I did see one instance where 2 frames were
>> dropped.
> I just noticed why a couple frames got dropped. You are running your X display frequency at 59.94 fps and playing a video at 60 fps. When repeated pictures occur it allows the video to catch up but in your video it has some long periods where there are no repeated pictures and when the video gets far enough behind it drops frames to catch up. If your display's refreshrate is higher than the frame rate then it shouldn't need to drop frames but occasionally extended the trigger. Your latest log with DRM indicate that the most recent patch is working correctly.
> Please try a higher display frequency to determine if the occasional dropped frames are eliminated. Other than this I think you should be good to go.
> --
> Taylor

Thanks.  I'll take a look into the X display frequency tomorrow.
Thanks for your patches, I'm glad I could help test things out.  I
have watched a few other shows with no problems as well.   I'm hopeful
this patch can go into upstream.  If you create a ticket, please post
the number here, and I'll keep an eye on it.


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