[mythtv-users] HD-PVR no audio (aac instead of ac3 on SPDIF)

[Michael Rice]

On Wed, Jan 5, 2011 at 8:07 PM, John P Poet <jppoet at gmail.com> wrote:
> On Wed, Jan 5, 2011 at 7:54 PM, Michael Rice <mikerice1969 at gmail.com> wrote:
>> Since upgrading to Fedora 14 and .24-fixes I am getting some
>> recordings without audio.
>>
>> The log shows that it thinks it is aac instead of ac3:
>>
>> Stream #0 pid(0x1011) type(video-h264  0x1b)
>>  Registration Descriptor: 'HDMV' Blu-Ray A/V for read-only media (H.264 TS)
>>  Stream #1 pid(0x1100) type(audio-aac  0xf)
>>
>> A correct recording would be:
>>
>>  Stream #0 pid(0x1011) type(video-h264  0x1b)
>>  Registration Descriptor: 'HDMV' Blu-Ray A/V for read-only media (H.264 TS)
>>  Stream #1 pid(0x1100) type(audio-ac3  0x81)
>>  Registration Descriptor: 'AC-3' ATSC audio stream A/52
>>
>> It seems to be happening in about 5-10% of my recordings but later recordings
>> with the same tuner seem to record fine.
>>
>> I didn't have this issue with Fedora 12 and 0.22-fixes.
>>
>> There was a thread on this in July but it wasn't clear if there was a solution.
>> I have my Motorola cable boxes locked at 720p and just use 6200ch to
>> change channels with firewire.  I never had to have a sleep in my channel
>> changes but would adding that help here?  Any other ideas to resolve this?
>
>
> It is possible that a sleep (even just 1 second) would fix this.  The
> HD-PVR can do some strange things when told to start recording, and
> the signal from the STB is not "crystal" clean.
>
> In 0.24, Myth does it's best to wait for "clean" video, but there is
> no way to wait for "clean" audio.

Just to follow-up on this in case others are interested.  I added a 2 second
sleep to my channel change script and I haven't had a audio-less recording
since (about 10 days).  I suspect 1 second would work as well but I
probably won't mess with it at this point.  Thanks for the help.