[mythtv-users] Suddenly started getting 'WriteAudio: buffer underrun'

[Philippe Van Der Gucht]

Right, you were faster. ;)

No ideas sofar.

Although an ex-colleague of mine who's in the same field of hobby 
vaguely recalled reading something about tv-vlaanderen introducing new 
encoding schemes. But there is nothing substantiative.

But channels like MGM or National Geographic do work allright.

Also the channels play just fine on my dedicated satellite receiver.

bram kortleven wrote:
> I too have the exact same issues now...
> after I did a rescan of the know transponders, I didn't have the video-speed-2x issues anymore, but more like a stuttery playback, both in live and recorded mode, of about 2 interruptions per seconds...
> 
> Any ideas?
> 
> ----- Original Message -----
> From: "Philippe Van Der Gucht" <philippe at vandergucht.org>
> To: mythtv-users at mythtv.org
> Sent: Saturday, October 2, 2010 9:50:01 PM
> Subject: Re: [mythtv-users] Suddenly started getting 'WriteAudio: buffer underrun'
> 
> More info, this is an extract of my frontend log:
> 2010-10-02 21:44:54.168 The realtime priority setting is not enabled.
> 2010-10-02 21:44:54.168 TV: Changing from None to WatchingLiveTV
> 2010-10-02 21:44:54.168 TV: State is LiveTV & mctx == ctx
> 2010-10-02 21:44:54.169 TV: UpdateOSDInput done
> 2010-10-02 21:44:54.169 TV: UpdateLCD done
> 2010-10-02 21:44:54.169 TV: ITVRestart done
> 2010-10-02 21:44:54.172 Video timing method: USleep with busy wait
> 2010-10-02 21:44:54.236 VDPAU: Added 2 output surfaces (total 4, max 4)
> 2010-10-02 21:44:56.783 ProgramInfo(): Updated pathname '':'' ->
> '18773_20101002214456.mpg' 2010-10-02 21:44:56.785 FilterManager: Failed
> to load filter
> 'colorspace', no such filter exists
> 2010-10-02 21:45:02.672 VDPAU: Created 2 output surfaces.
> 2010-10-02 21:45:02.672 VDPAU: Created VDPAU render device 1920x1080
> 2010-10-02 21:45:02.709 NVP(5): Forcing decode extra audio option on
> (Video method requires it).
> 2010-10-02 21:45:02.711 FilterManager: Failed to load filter
> 'colorspace', no such filter exists
> 2010-10-02 21:45:02.711 AFD: Opened codec 0xb03bc7d0, id(MPEG2VIDEO)
> type(Video) 2010-10-02 21:45:02.711 AFD: codec MP2 has 2 channels
> 2010-10-02 21:45:02.712 AFD: Opened codec 0xb141a400, id(MP2)
> type(Audio) 2010-10-02 21:45:02.712 AFD Error: Could not find decoder
> for codec
> (DVB_TELETEXT), ignoring.
> 2010-10-02 21:45:02.826 Opening audio device 'default'. ch 2(2) sr 48000
> (reenc 0)
> 2010-10-02 21:45:02.826 Opening ALSA audio device 'default'.
> 2010-10-02 21:45:02.875 mixer unable to find control Master 1
> 2010-10-02 21:45:02.876 NVP(5): Enabling Audio
> 2010-10-02 21:45:02.913 VDPAU: Added 2 output surfaces (total 4, max 4)
> 2010-10-02 21:45:06.210 NVP(5): prebuffering pause
> 2010-10-02 21:45:06.387 NVP(5): prebuffering pause
> 
>>From here on it's nothing but these 'prebuffering pause' in the log...
> 
> Philippe Van Der Gucht wrote:
>> Greetings!
>>
>> I had a smooth running mythtv 0.22+fixes system with a HVR-4000 and 2
>> days ago recordings started to stutter.
>>
>> This only happens with certain channels of my satellite provider
>> 'tv-vlaanderen'. I am almost certain they changed the encoding of
>> their channels.
>>
>> However when playing the recordings via the console with mplayer
>> everything runs smoothly!
>> This is how I know mythtv's internal player does not know how to
>> handle them.
>>
>> I have upgraded to 0.23.0+fixes but to no avail.
>>
>> Can I at least use an external player for recordings as a workaround?
>> I have not found how.
>>
>> Thanks for any help.
>>
>>
> 
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