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

JWA jwa at macbidouille.com
Thu Jul 22 08:31:12 UTC 2010


On Thu, Jul 22, 2010 at 00:27, Matt Goebel <matt at goebelnet.com> wrote:
> 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
>>
>> _______________________________________________
>> mythtv-users mailing list
>> mythtv-users at mythtv.org
>> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>
> 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.

Hmm... I have a DCX3200 as well.  I wonder if it's just limited to
this model?  Maybe my updating the HD-PVR firmware just happened to
coincide with a firmware update to the DCX3200?  But since it works
fine using my Mac, just not my Linux box, it can't be purely the STB.


More information about the mythtv-users mailing list