[mythtv-users] Trouble playing AC3-encoded recordings on analog audio

[kanetse@gmail.com]

On Sat, Aug 30, 2008 at 9:44 PM, kanetse at gmail.com <kane.tse at gmail.com> wrote:
> On Sat, Aug 30, 2008 at 9:09 PM, Allen Edwards
> <allen.p.edwards at gmail.com> wrote:
>> I say this to everyone, try and delete (rename) ALSA.conf and .asoundrc
>> There are defaults that work fine.
>
> I tried deleting /usr/share/alsa/alsa.conf, there was no .asoundrc to
> delete , and all I ended up with was videos playing with no sound, and
> no soundcard detected by the MythTV.  The videos didn't stutter
> though... although without sound it's not really watchable.
>
> I haven't adjusted anything from the defaults, since I've tried clean
> installs from 3 different distros (CentOS5.2, Fedora 9, Mythbuntu);
> and they all exhibit the same problem; essentially on default
> settings.
>

Still struggling with this problem.  Currently, I'm using Ubuntu
8.04.1, with Catalyst 8.3, and this is what I am seeing in the
mythfrontend log when the audio & video stuttering is occurring:

2008-09-02 21:09:30.224 AFD: Opened codec 0x38cf540, id(MPEG2VIDEO) type(Video)
2008-09-02 21:09:30.224 AFD: codec AC3 has 6 channels
2008-09-02 21:09:30.225 AFD: Opened codec 0x38ce2c0, id(AC3) type(Audio)
2008-09-02 21:09:36.090 VideoOutputXv: XVideo Adaptor Name: 'ATI
Radeon AVIVO Video'
2008-09-02 21:09:36.421 OSD Theme Dimensions W: 640 H: 480
2008-09-02 21:09:36.964 TV: Changing from None to WatchingPreRecorded
2008-09-02 21:09:36.967 Realtime priority would require SUID as root.
2008-09-02 21:09:37.053 Video timing method: USleep with busy wait
2008-09-02 21:09:37.233 AO: dropping back audio_buffer_unused
2008-09-02 21:09:37.238 WriteAudio: buffer underrun
2008-09-02 21:09:37.245 NVP: prebuffering pause
2008-09-02 21:09:37.339 WriteAudio: buffer underrun
2008-09-02 21:09:37.397 AO: dropping back audio_buffer_unused
2008-09-02 21:09:37.443 AO: dropping back audio_buffer_unused
2008-09-02 21:09:37.469 NVP: prebuffering pause
2008-09-02 21:09:37.573 AO: dropping back audio_buffer_unused
2008-09-02 21:09:37.623 AO: dropping back audio_buffer_unused
2008-09-02 21:09:37.654 AO: dropping back audio_buffer_unused
2008-09-02 21:09:37.654 NVP: prebuffering pause
2008-09-02 21:09:37.755 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:37.763 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:37.763 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:37.763 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:37.777 AO: dropping back audio_buffer_unused
2008-09-02 21:09:37.784 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:37.794 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:37.807 AO: dropping back audio_buffer_unused
2008-09-02 21:09:37.812 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:37.828 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:37.838 AO: dropping back audio_buffer_unused
2008-09-02 21:09:37.844 NVP: prebuffering pause
2008-09-02 21:09:37.943 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:37.950 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:37.958 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:37.964 AO: dropping back audio_buffer_unused
2008-09-02 21:09:37.977 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:37.984 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:37.993 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:37.993 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:37.993 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:37.994 AO: dropping back audio_buffer_unused
2008-09-02 21:09:37.999 AO: dropping back audio_buffer_unused
2008-09-02 21:09:38.004 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:38.012 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:38.022 NVP: prebuffering pause
2008-09-02 21:09:38.104 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:38.111 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:38.119 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:38.126 AO: dropping back audio_buffer_unused
2008-09-02 21:09:38.127 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:38.135 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:38.147 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!
2008-09-02 21:09:38.155 NVP::AddAudioData():p2: Audio buffer overflow,
audio data lost!


It only occurs when skipping through the recording.  If I let the
recording play from beginning to end, everything is fine.