[mythtv-users] analog MPEG4 encoding + 1080i live tv - preformace regression?

jafa jafa at silicondust.com
Wed Jan 31 05:03:22 UTC 2007

> Hi all,
> My MythTV machine is having problems with latest top of trunk.
> Previously MythTV would quite happily record an analog channel (software 
> MPEG4 encoding) while watching 1080i live tv (HDHomeRun). The previous 
> svn update was about 2 weeks ago and it worked ok.
> With the latest top of trunk in the same situation - the backend is 
> reporting "Ran out of free AUDIO buffers" and the frontend is reporting 
> pre-buffering pauses. The audio comes and goes and the video is dropping 
> frames.
> The machine is a AMD 3000+ with a nVidia 6200 graphics card.
> I disabled deinterlacing, disabled high quality MPEG4 encoding, and 
> restarted the backend - slight improvement but still unwatchable. 
> Switched to libmpeg2 - worse.
> The backend was using around 40-45% CPU which seems high (not sure).
> Live tv started working again when I told mythtv to stop the analog 
> recording.
> House is on tonight - I have killed all analog jobs :-)
> Nick
More testing - it is having trouble playing back 1080i video even 
without recording.

The video is ok but the audio has dropouts. No console messages.

When I disable de-interlacing it plays ok.


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