[mythtv-users] Audio buffer underruns

[Jean-Yves Avenard]

Hi

Le samedi 23 août 2014, Victor Brunini <victorbrunini at gmail.com> a écrit :

> Hi all,
>
> I have a combined backend/frontend system that I've been using without any
> issues for ~1 year now. Starting in the middle of this week I am suddenly
> getting constant audio buffer underruns when trying to play any video in
> mythtv. Thus far I have tried/tested:
>
> 1) Set /proc/asound/card0/pcm1p/sub0/prealloc to it's maximum value of
> 32768.
> 2) Tried both AC3 passthrough and standard PCM output in mythtv without
> success. With PCM the audio is constantly stuttering. With AC3 passthrough
> I get a brief (~1s) period of sound and after that see the receiver
> constantly switching in and out of Dolby Digital mode due to the buffer
> underruns.
> 3) Confirmed that mplayer and VLC both play the same video files with
> either PCM or AC3 passthrough without any issues.
> 4) Confirmed that if I set the mythtv audio output device to NULL video
> playback is very smooth and CPU usage is minimal (I'm using VDPAU for video
> decoding).
> 5) Tried updating to the latest v0.27.3-152-g926bb8d fixes version
> available on the mythbuntu repositories (prior to the issues I had disabled
> automatic updates).
>
> A section of the log file generated running with -v audio is available at
> http://pastebin.com/J5wZgTYN
>

Problem is that you've cut your log too much... As a rule of thumb, when
reporting a playback problem: never strip your code! As I'm guessing if you
knew what to look for in the log, you wouldn't be asking on how to solve
your problem here...

What's your video card and what playback profile are you using?
Change to VDPAU Normal
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