[mythtv-users] MythTV 0.24-1.80 - No sound on HD TV recording

PJR pjrobinson at metronet.co.uk
Wed Apr 25 14:14:12 UTC 2012



>
> On 23/04/12 22:07, John Pilkington wrote:
>> On 23/04/12 19:51, PJR wrote:
>>> I recorded 'The Italian Job' from ITV HD the other day and when I play
>>> it there's sound from the TV broadcast prior to the movie but as soon as
>>> it starts there's no sound what so ever. This despite my AV amp
>>> (connected to the mythbox by HDMI) showing it's receiving 5.1 sound but
>>> no sound out of the speakers.  All other HD TV recordings playback sound
>>> in the appropriate number of channels.  Any thoughts as to what's gone
>>> wrong?   Setting or un-setting Dolby, DTS etc in mythfrontend makes no
>>> difference. The TV decoder is a PC nano Stick 290e which has worked
>>> without fault.
>> vlc hung up when asked to play my recording but was fine after I
>> chopped off the beginning.  There isn't any sound anyway until the
>> initial pan down gets to the viaduct.
>>
>> ffmpeg -i on the chopped file says:
>>     Stream #0:0[0x12d]: Video: h264 (High) ([27][0][0][0] / 0x001B),
>> yuv420p, 1440x1080 [SAR 4:3 DAR 16:9], 29.17 fps, 50 tbr, 90k tbn, 50 tbc
>>     Stream #0:1[0x12e](eng): Audio: aac_latm ([17][0][0][0] / 0x0011),
>> 48000 Hz, 5.1, s16
>>     Stream #0:2[0x132](eng): Audio: aac_latm ([17][0][0][0] / 0x0011),
>> 48000 Hz, 2 channels (FC), s16 (visual impaired)
>>     Stream #0:3[0x131](eng): Subtitle: dvb_subtitle ([6][0][0][0] /
>> 0x0006)
>>
>>
>>
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>>
> What did you use to chop off the beginning of the file?  I don't want to
> upgrade to 0.25 just yet; there seems a lot of issues with it and it's
> taken me some time to get 0.24 working on my h/w setup.  Is there a
> backport of the AAC audio updates to 0.24 or some such?
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>
Attached is a snip of the mythtvfrontend log which looks like the
problem.  Log is around the time of playing back the recorded
programme.  The problem looks around the time between 2012-04-25
14:51:39.329 and 2012-04-25 14:52:14.224.

This looks about the time the audio on the play-in from the recording is
ok and when the movie starts the audio stops.
 
2012-04-25 14:51:39.161 TV: Changing from None to WatchingPreRecorded
2012-04-25 14:51:39.311 ScreenSaverX11Private: DPMS Deactivated 1
2012-04-25 14:51:39.329 VDPAU: Added 2 output surfaces (total 4, max 4)
2012-04-25 14:52:14.224 [aac_latm @ 0x3b50b40]channel element 0.0 is not
allocated
2012-04-25 14:52:14.224 AFD Error: Unknown audio decoding error

If this is a known AAC problem that is solved in 0.25 then I can wait
till I upgrade to 0.25 before watching the movie, after all it's a
timeless classic.
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