[mythtv-users] Stuttering in DVD menus

[Neil Salstrom]

On Sep 19, 2012 12:36 PM, "Richard" <peper03 at yahoo.com> wrote:
>
> Hi,
>
> Most of the DVDs I've tried recently suffer from stuttering audio/video
in the menus.  It only seems to affect animated menus and only when VDPAU
is used for playback.  OpenGL works fine but that gives me other issues
watching recordings so I'd rather not use OpenGL.
>
> I've tried ripping a DVD to ISO and playing it back from the local hard
drive to make sure it wasn't some sort of issue with the DVD itself but it
doesn't help.
>
> Starting mythfrontend with -v audio,playback gives lots of errors:
>
> 2012-09-19 21:29:38.611274 I  AO: enc(0), passthru(0), features (LPCM)
configured_channels(2), 2 channels supported(1) max_channels(2)
> 2012-09-19 21:29:38.611282 I  AO: Audio processing enabled
> 2012-09-19 21:29:38.611294 I  AO: Opening audio device
'plughw:CARD=PCH,DEV=0' ch 2(2) sr 48000 sf signed 32 bit reenc 0
> 2012-09-19 21:29:38.611300 I  ALSA: OpenDevice plughw:CARD=PCH,DEV=0
> 2012-09-19 21:29:38.611507 I  ALSA: SetParameters(format=10, channels=2,
rate=48000, buffer_time=500000, period_time=4)
> 2012-09-19 21:29:38.611753 I  ALSA: Buffer size range from 32 to 8192
> 2012-09-19 21:29:38.611760 I  ALSA: Period size range from 16 to 4096
> 2012-09-19 21:29:38.611796 I  ALSA: Buffer time = 170666 us
> 2012-09-19 21:29:38.611850 I  ALSA: Period time = 4 periods
> 2012-09-19 21:29:38.611996 I  ALSA: Buffer size = 8192 | Period size =
2048
> 2012-09-19 21:29:38.612032 I  AO: Audio fragment size: 8192
> 2012-09-19 21:29:38.612037 I  AO: Software volume enabled
> 2012-09-19 21:29:38.645069 I  AO: Audio Stretch Factor: 1
> 2012-09-19 21:29:38.645109 I  AO: Ending Reconfigure()
> 2012-09-19 21:29:38.645196 I  AO: kickoffOutputAudioLoop: pid = 5820
> 2012-09-19 21:29:38.645215 I  AO: OutputAudioLoop: Play Event
> 2012-09-19 21:29:38.784646 I  AFD: Key frame distance changed from 15 to
11.
> 2012-09-19 21:29:38.875333 I  Player(0): Video is 4.82812 frames ahead of
audio,
>                         doubling video frame interval to slow down.
> 2012-09-19 21:29:38.995329 I  Player(0): Video is 6.19607 frames ahead of
audio,
>                         doubling video frame interval to slow down.
> 2012-09-19 21:29:39.057410 I  ALSA: WriteAudio: buffer underrun
> 2012-09-19 21:29:39.115321 I  Player(0): Video is 6.72205 frames ahead of
audio,
>                         doubling video frame interval to slow down.
> 2012-09-19 21:29:39.235328 I  Player(0): Video is 6.62278 frames ahead of
audio,
>                         doubling video frame interval to slow down.
>
>
>
> I don't get stuttering playing back recordings (whether HD or SD) nor in
the actual film itself - only in animated DVD menus.
>
> Does anyone have any ideas what the root cause of the problem could be?
>
> To my untrained eye, it doesn't seem to be a video decoding problem as
the video is waiting for the audio to catch up.  Obviously Myth has to sync
video to audio but why should VDPAU cause sync problems only in animated
DVD menus?
>
> As always, I'd be very grateful for any hints or ideas.
>
> Richard.
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> mythtv-users at mythtv.org
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I've had this exact same problem for a while now. Sometimes it is so bad I
cannot play the disc without resorting to different tricks to select a
chapter.

I have not tried with 0.26 but the problem is there with 0.25 fixes.

Neil
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