[mythtv-users] HDTV Patch Feedback

[Ben de Luca (bedel)]

where do these patches come from?



On 09/05/2004, at 9:24 AM, XKE GUY wrote:

> I've applied some of Daniel's HDTV patches with very
> good success.  I want to thank Daniel for providing
> these patches, as they've allowed me make a useable
> system.
>
> Here are the specifics of my system.
> Athlon XP 2400, ECS K7VTA3 MB, 512MB RAM, 250GB HD,
> Geforce4 VGA, pcHDTV, custom 2.4.21 kernel, chaintech
> sound card w/ optical out.
>
> I've applied the following patches to the May 7th 4:00
> PM PST CVS:  xvmc-playback-v2.patch,
> hdtv-recorder-v6.patch, hdtv-signalcheck-v7.patch.
>
> Now hdtv recordings playback almost flawlessly.
> During a one hour show I might have only 2 or 3 little
> "glitches".  These glitches might have a small
> checkerboard pattern for just half a second.  When I
> skip ahead or back, the audio and video stutter until
> the OSD has faded.  When the camera pans fast I
> sometimes see wavy artifacts.  This seems to be more
> apparent on 1080i material (CBS) than 720p material
> (NBC).  I'm running about 35% cpu utilization.  This
> is great, this is more than useable for me.
>
> When I tune to a digital channel that isnt showing
> 16:9 HDTV material, I have audio glitches.  This would
> be a 4:3 screen inside the 16:9 window (like TV news
> or a talk show, any non-HD material).  The audio has
> terrible stutters.  This stuttering occurs on PBS,
> ABC, CBS, UPN, and Fox.  The stuttering does not occur
> on the WB and NBC.  Both the WB and NBC channel are
> owned by the same company and broadcast from the same
> tower.  This stuttering does not occur on HD material.
>  Mythfrontend and backend give no errors.  When run in
> verbose mode, mythfrontend says "Audio thread waiting
> for buffer to fill fragment_size=4096, audiolen=4096".
>  Again, this stuttering doesnt occur on true HD
> material.  I am using the optical output of my sound
> card.  I do not have "AC3 output" in Mythtv setup.  I
> do have "Agressive Buffering" and "Extra Buffering"
> enabled.  Changing these seems to make no difference
> or other options seems to not help.
>
> Live TV has some issues.  The OSD seems to really
> botch up playback on live streams.  If I go directly
> to "Watch TV" it pops up the picure and everything is
> fine (because it never brings up the OSD).  If I
> change channels the OSD come ups and everything starts
> to stutter and slow.  Sometimes it doesnt ever catch
> up and the frontend crashes or just displays a picture
> at 1 frame per second.  Even when the OSD disappears,
> it won't "catch".
>
> The hdtv-recorder-v7 patch did not work at all for me.
>  Whenever I tried to record something from Fox or PBS
> mythbackend seg faulted immediately.  V6 does not
> crash, and works great with my setup.
>
>
>
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