[mythtv-users] hd-pvr problem recording audio after firmware update

[Matt Goebel]

On 7/22/2010 2:44 AM, Alan Young wrote:
> John P Poet wrote:
>> On Wed, Jul 21, 2010 at 5:10 PM, Alan Young <ayoung at teleport.com> wrote:
>>> JWA wrote:
>>>>  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)
>>> I've seen this for a while. I have not figured out what's causing 
>>> it.  If
>>> the HDPVR recording gets identified as AAC audio, it either does not 
>>> record
>>> right or it is play back right.  I haven't figured out which.  If the
>>> recording shows AC3, it plays back ok.  In my case, I'm not using the
>>> current firmware.  It's from May 2009.  I'm not having to reboot to 
>>> correct
>>> it.  If I stop the recording and then restart it right away, it gets
>>> identified as AC3 and then it records correctly.
>>
>> Are you using:
>>
>> http://svn.mythtv.org/trac/ticket/6719
>> and
>> http://svn.mythtv.org/trac/ticket/6611
>>
>> ???  Those patches may help this situation.  Note that I have recently
>> updated the -fixes patch on #6719.
>>
>>
>> John
> I went back over my setup and I think it's still somehow tied to whole 
> channel change process.
>
> I noticed that in my channel change script, it sleeps 2 seconds before 
> it returns to myth.  My notes indicate I had that up as high as 2.6 
> seconds.  I've increased the delay 2.3 to see if that makes a 
> difference and may try it higher too.
>
> Before I made that change I caught another of these errors happen this 
> evening.  I was able to flip over to the console and verify with 
> v4l2-ctl that the input was set to SPDIF.   I don't have boost audio set.
>
> I think I may have tried those patches in the past.  I don't have them 
> applied at the moment.  I'll take a look at them again.
>
> Alan
>
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I don't thing this is channel change script sleep time related at all.  
I also don't think it's MythTV related either.

Results from further testing, still no change:"

1. Downgrade firmware from 1.5.7.0 to 1.5.6.0 - no difference
2. Setting audio_encoding=4 (AC3) with v4l2-ctl - only difference is 
that problem channels now show AC3 instead of AAC, previously everything 
that works shows AC3 and doesn't AAC, changed it back
3. Turned off audio boost - no difference
4. Changed the sleep time in my change channel script - only difference 
is how stable channel changes are, too low I get audio stutter, too high 
live TV can crash.  It makes absolutely no difference if I get audio on 
a problem channel or not as the same problem channels don't work, the 
good ones still do.
5. Tested output outside of myth with a problem channel ("cat 
/dev/video0 > test.ts") - playing back the audio file I still have the 
same no audio problem I see in myth

Based on the above I'm thinking this is either STB or driver related.  I 
can't see how MythTV is involved as it happens outside Myth too.  
Basically if mythfrontend -v record shows audio as AAC is 100% doesn't 
work and if it's AC3 it 100% does.  Unfortunately  I have a Motorola 
DCX3200 STB which appears to have no audio configuration options if 
you're not using HDMI.