[mythtv-users] Choppy Video on Playback and LiveTV, not with mplayer

[Nick]

On 22/09/05, Lee Koloszyc <teething12 at hotmail.com> wrote:
> Hello all,
>
> I am having a problem with mythtv 0.18.1 on Gentoo kernel 2.6.12-r10 on
> both livetv and playing pre-recorded videos.
> The play back is supper choppy and pauses about every 2 seconds.
> Playing the same file directly through mplayer or gmplayer and it runs
> as smooth as butter.
> The recording works fine though even while recompiling X in the background.
> I am running on a somewhat slow system: P3 800, VT6x4 mother board, 512M
> ram, Radeon 9250 256mb, PVR150, SBLive.
> I am using the ATI binary drivers 8.16.20.
> I also had the same problem with an Nvidia FX5200 card in the system,
> but had to return the card because of less then desirable svideo output.

<snip>

I'd be worried why it's still trying to use an nvidia device when
you're now using an ATI card. It could likely be related to vsync also
- try using a different method (along with the correct driver) and so
if this improves things.

> 2005-09-22 12:32:11.993 nVidiaVideoSync: Could not open device
> /dev/nvidia0, No such file or directory
> 2005-09-22 12:32:11.995 DRMVideoSync: VBlank ioctl did not work,
> unimplemented in this driver?
> 2005-09-22 12:32:12.019 Using realtime priority.
> 2005-09-22 12:32:13.111 OpenGLVideoSync: GLX extensions:
> GLX_EXT_visual_info GLX_EXT_visual_rating GLX_EXT_import_context
> GLX_ARB_get_proc_address GLX_ARB_multisample
> 2005-09-22 12:32:13.112 OpenGLVideoSync: GLX Video Sync extension not
> present.
> 2005-09-22 12:32:13.118 Using audio as timebase
> 2005-09-22 12:32:13.119 Video timing method: RTC
> 2005-09-22 12:32:13.119 Refresh rate: 16579, frame interval: 33366
> 2005-09-22 12:32:13.119 waiting for prebuffer...
> 2005-09-22 12:32:13.253 prebuffer wait timed out..
> 2005-09-22 12:32:13.253 waiting for prebuffer...
> 2005-09-22 12:32:15.607 prebuffering pause

This buffering could be video or audio related (I'd recommend trying a
new version of ALSA instead of OSS if the video driver issue doesn't
help).

Nick