[mythtv-users] HD-PVR audio sync issues

[Jim Stichnoth]

On Mon, Jan 17, 2011 at 1:20 PM, mythtv at blandford.net
<mythtv at blandford.net> wrote:
> Hello,
>
> I recently made the transition from cable to dish network.
>
> I am running Fedora 14 with mythtv from rpmfusion 0.24-2.fc14.x86_64
> packages.
>
> My backend has two HD-PVRs connecting to dishnetwork vip 211k receivers
> using SPDIF.
>
> I am having bad audio sync issues.  I see it in two cases.
>
> 1) When changing channels the audio is off by about 2 seconds.  This can
> some times be fixed by changing to a different channel and back, but not
> always.
> 2) Watching a show for 30 minutes will result in 2-3 second audio lag by the
> end of the show.  Exiting and coming back into the channel fixes the issue.
>
> I see lots of posts from people who are using the HD-PVR, so I am guessing I
> am missing some simple setup peice.
>
> Any suggestions on how to eliminate the audio lag issues?

Problem #2 is the audio drift problem that has been noted here before.
 In my case, the audio frame rate would be identified as 59.94Hz but
the video frame rate would be incorrectly marked as 60Hz, leading to
the drift.  I was only able to solve this be reverting to an earlier
version of the firmware
(http://hauppauge.lightpath.net/software/hd_pvr/hdpvr_v1.0.5.301.zip)
and using the RCA stereo audio inputs.  (It's possible that the
digital audio input would work properly with the older firmware, but I
don't want to experiment due to WAF issues.)  I also noted that
loading a newer version of the firmware might appear to fix the audio
drift, only to have it return a day or two later.

I've never seen problem #1 on my system.

Jim