[mythtv] Prebuffering pause / Broadcasting free space avail / audio waiting for buffer to fill

[Derek Meek]

suggestion: post in mythtv-users not mythtv-dev

oh and use ATI's proprietary drivers if you're not already - it's a pain
to get them to work correctly (XV) in dual-head but it can be done

Gee, David wrote:

>Hi all
>
>I've posted on this subject before but not got very far, and I am keen
>to get to the bottom of this as it's a headache to watch TV at the
>moment. Last time I assumed that the problems I was having were an
>artifact of running dual-head, which I have now eliminated as a
>possibility by testing in single-head mode. The problem I have is that
>when either watching live TV or viewing recordings, I get about a second
>or so's video and audio (correctly in sync), then a silent gap of a
>couple of seconds (with a frozen picture), then the next second or so of
>video and audio. So whenever it plays, it's in sync, and the stuff it
>plays is correct, there's just these irritating two second (or so) gaps
>every three seconds or so.
>
>Digging some further, this is the sort of output I get from mythfrontend
>-v all:
>
>2006-06-27 21:32:11.952 audio waiting for buffer to fill: have 3072 want
>4096
>2006-06-27 21:32:11.953 Broadcasting free space avail
>2006-06-27 21:32:11.959 audio waiting for buffer to fill: have 3072 want
>4096
>2006-06-27 21:32:11.959 Broadcasting free space avail
>2006-06-27 21:32:11.963 audio waiting for buffer to fill: have 3072 want
>4096
>2006-06-27 21:32:11.963 Broadcasting free space avail
>2006-06-27 21:32:11.967 audio waiting for buffer to fill: have 3072 want
>4096
>2006-06-27 21:32:11.967 Broadcasting free space avail
>2006-06-27 21:32:11.973 audio waiting for buffer to fill: have 3072 want
>4096
>2006-06-27 21:32:11.973 Broadcasting free space avail
>2006-06-27 21:32:11.979 audio waiting for buffer to fill: have 3072 want
>4096
>2006-06-27 21:32:11.979 Broadcasting free space avail
>2006-06-27 21:32:11.983 audio waiting for buffer to fill: have 3072 want
>4096
>2006-06-27 21:32:11.983 Broadcasting free space avail
>
>with various other messages such as
>
>2006-06-27 21:31:51.917 NVP: Audio is 3.81795 frames ahead of video,
>                        doubling video frame interval.
>2006-06-27 21:31:51.918 NVP: Audio is 4.6072 frames ahead of video,
>                        doubling video frame interval.
>
>and
>
>2006-06-27 20:31:12.752 NVP: Waiting for prebuffer.. 1
>UuAAAAAAAAAAAAAAAAAAAAAAUUuUULA
>2006-06-27 20:31:12.918 NVP: Waiting for prebuffer.. 2
>UULAAAAAAAAAAAAAAAAAAAAAUUUUUuA
>2006-06-27 20:31:16.318 NVP: prebuffering pause
>2006-06-27 20:31:16.318 NVP: Waiting for prebuffer.. 0
>AAAAAAAAAAAAAALAALAAAAUAAAAAAAA
>2006-06-27 20:31:29.297 NVP: prebuffering pause
>2006-06-27 20:31:29.297 NVP: Waiting for prebuffer.. 0
>AAAAAAAAAAAAAAuAALAAAAAAAAAAAAA
>2006-06-27 20:31:39.016 NVP: prebuffering pause
>2006-06-27 20:31:39.016 NVP: Waiting for prebuffer.. 0
>AAAALAAAAAAAAAAAAAAAAAAAAaLAAAU
>2006-06-27 20:31:42.298 NVP: prebuffering pause
>2006-06-27 20:31:42.298 NVP: Waiting for prebuffer.. 0
>AAAAAAAAAAAAAALAALAAAAAAAAAAUAA
>2006-06-27 20:31:48.723 NVP: prebuffering pause
>2006-06-27 20:31:48.723 NVP: Waiting for prebuffer.. 0
>AAaAALAAAAAAAAAAAAAAAuAAAAAAAAA
>2006-06-27 20:31:51.984 NVP: prebuffering pause
>2006-06-27 20:31:51.984 NVP: Waiting for prebuffer.. 0
>AAALAAAAAUAAAAAAAaALAAAAAAAAAAA
>
>I've tried all the various decoders (Std, Std XvMc, VIA XvMC, libmpeg2),
>and also tried fiddling with all the obvious options (aggressive audio
>buffering, realtime threads, interlacing, and so on), all to no avail.
>The only thing that makes some sense was one comment I got back that it
>was maybe some incompatibility with the X.org radeon driver (I have an
>ATI Radeon 9200SE using the standard radeon driver), although given that
>MythTV *used* to work without these problems on this exact same hardware
>about a year ago under FC4 (I'm now running FC5), I'd be surprised if
>that was it.
>
>I'm confident that it's not a driver problem (ivtv), for two reasons:
>playing /dev/video0 with mplayer directly is perfect, and playing mpg
>files recorded by myth in an external program such as xine is also
>perfect. So mythtv is getting the video data correctly, it's somewhere
>between there and the screen that things go awry.
>
>My setup:
>
>AMD XP 2700
>1GB RAM
>120GB WDC HD
>ATI Radeon 9200 SE graphics card with VGA+DVI out, running dual-head at
>a combined resolution of 2704x1050
>Hauppauge WinTV PVR 150 PAL retail
>Fedora Core 5, updated with all RPMS from Redhat, freshrpms and atrpms
>repositories
>Kernel 2.6.16-1.2133_FC5.i686
>mythtv-suite 0.19-59.at
>ivtv 0.6.2
>
>
>Suggestions anyone?
>
>Thanks in advance,
>David
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