[mythtv-users] mp4 files not playing audio

Neil Salstrom salstrom at gmail.com
Wed Nov 25 05:29:44 UTC 2009

On Tue, Nov 24, 2009 at 9:23 PM, David Brodbeck <gull at gull.us> wrote:
> Neil Salstrom wrote:
>> I've got a number of mp4 files that I've made (encoded vhs tapes) and
>> when playing I get no audio.  The files work fine in xine-vdpau.
>> I'm running a self compiled 0.22-fixes. (Revision: 22867M)
>> This is what I get in the log:
>> 2009-11-18 19:47:29.361 TV: Attempting to change from None to Watching
>> Video
>> 2009-11-18 19:47:29.436 TV: StartPlayer(0, Watching Video, main) -- begin
>> 2009-11-18 19:47:30.022 AFD: Opened codec 0x7f1fd0c8c9f0, id(MPEG4)
>> type(Video)
>> 2009-11-18 19:47:30.022 AFD: codec AAC has 2 channels
>> 2009-11-18 19:47:30.022 AFD: Opened codec 0x7f1fd0b80e80, id(AAC)
>> type(Audio)
>> 2009-11-18 19:47:30.023 Opening audio device 'spdif'. ch 2(2) sr 96000
>> 2009-11-18 19:47:30.023 Opening ALSA audio device 'spdif'.
>> 2009-11-18 19:47:30.025 AudioOutput Error: Rate doesn't match
>> (requested 96000Hz, got 48000Hz)
>> 2009-11-18 19:47:30.026 AudioOutput Error: Unable to set ALSA parameters
>> 2009-11-18 19:47:30.028 NVP(2): Disabling Audio, reason is: Unable to
>> set ALSA parameters
>> Do I need to re-encode the audio for these to play or is this a issued
>> with something in mythtv?  Audio for everything else works fine.
> The file has an audio sample rate of 96 kHz, but your audio output device
> can only handle 48 kHz.
> I had the same problem with one of my systems.  Apparently the fix is to set
> up an asound.conf that tells ALSA to resample the audio on the fly.
>  Unfortunately the wiki reorganization broke all the links to how to do that
> in the mailing list archive.  I never did figure it out.  Since I was using
> analog instead of digital output I switched to using /dev/dsp instead of
> ALSA:default, avoiding all the nasty ALSA stuff.
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Thanks for the input.  I'll see what I can dig up on creating a
asound.conf.   I'm sure someone around has attacked the problem!   The
strange thing is how xine-vdpau has no issue playing it with audio.  I
tried with mplayer and that also had no audio.

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