[mythtv-users] Brief video judder during playback

Wed May 23 10:58:04 UTC 2012

My modes from my Panasonic plasma are as follows (found by using
the Option "ModeDebug" "true" in xorg)

"1920x1080"          : 1920 x 1080 @  50.0 Hz Interlace  (from: EDID)
"1920x1080_50i"      : 1920 x 1080 @  50.0 Hz Interlace  (from: EDID)
"1920x1080_60"       : 1920 x 1080 @ 59.94/60 Hz (CEA-861B Format 16)
(from: EDID)
"1920x1080_50"       : 1920 x 1080 @ 50 Hz (CEA-861B Format 31) (from: EDID)
"1920x1080_24"       : 1920 x 1080 @ 23.97/24 Hz (CEA-861B Format 32)
(from: EDID)
"1920x1080_60i"      : 1920 x 1080 @  60.1 Hz Interlace  (from: EDID)
"1920x1080_60i_0"    : 1920 x 1080 @ 59.94/60 Hz (CEA-861B Format 5) (from:
EDID)

So I have chosen just the 3
"1920x1080_60", "1920x1080_50" and "1920x1080_24"

I definitely have 'Force Full GPU Scaling' box unchecked

On Sun, May 20, 2012 at 8:50 AM, David Farmer <remrafevad at gmail.com> wrote:

> Hi,
> I'm using MythTV 0.25 on Arch linux with an Nvidia GT 430, and my playback
> set to use VDPAU for all recordings. I have a user job that transcodes all
> recordings to .mkv immediately after recording is finished.
> My xorg.conf uses the option "CustomEDID"
> "DFP-1:/etc/X11/edid_Panasonic.bin" that I saved from nvidia-settings, and
> I only use 3 modes. 1080p at 60Hz, 1080p at 50Hz and 1080p at 24Hz.
>
> During playback (since upgrading to 0.25) I get what seems like a few
> frames dropping (judder) every 5-10 minutes when I view the playback with
> MythTV. However, I do not see the same problem when I view the same .mkv
> file with XBMC. Also, if I rewind the scene in MythTV and view it again I
> do not see the judder.
>
> I ran the frontend with "mythfrontend -v playback --loglevel=debug >
> /home/david/MythTV/mythplayback20120520_082900.log" and around the time of
> the issue I get this:
>
> 2012-05-20 08:34:15.096448 I  Player(0): FPS:   25.01 Mean: 39988 Std.Dev:
>   107 CPUs: 0% 3%
> 2012-05-20 08:34:15.498838 I  AFD: Key frame distance changed from 46 to
> 47.
> 2012-05-20 08:34:19.015662 I  Player(0): 7200 progressive frames seen.
> 2012-05-20 08:34:19.096445 I  Player(0): FPS:   25.01 Mean: 39988 Std.Dev:
>   104 CPUs: 0% 1%
> 2012-05-20 08:34:19.978526 I  AFD: Key frame distance changed from 47 to
> 112.
> 2012-05-20 08:34:21.976198 I  AFD: Key frame distance changed from 112 to
> 50.
> 2012-05-20 08:34:23.096477 I  Player(0): FPS:   25.01 Mean: 39988 Std.Dev:
>   103 CPUs: 0% 0%
> 2012-05-20 08:34:24.500470 I  AFD: Key frame distance changed from 50 to
> 63.
> 2012-05-20 08:34:27.096472 I  Player(0): FPS:   25.01 Mean: 39988 Std.Dev:
>   109 CPUs: 0% 1%
> 2012-05-20 08:34:30.817576 I  AFD: Key frame distance changed from 63 to
> 158.
> 2012-05-20 08:34:31.096458 I  Player(0): FPS:   25.01 Mean: 39988 Std.Dev:
>   105 CPUs: 0% 1%
> 2012-05-20 08:34:32.940184 I  AFD: Key frame distance changed from 158 to
> 53.
> 2012-05-20 08:34:35.015671 I  Player(0): 7600 progressive frames seen.
> 2012-05-20 08:34:35.096474 I  Player(0): FPS:   25.01 Mean: 39988 Std.Dev:
>   105 CPUs: 1% 0%
> 2012-05-20 08:34:39.116440 I  Player(0): FPS:   24.88 Mean: 40188 Std.Dev:
>  2008 CPUs: 0% 1%
> 2012-05-20 08:34:40.597611 I  AFD: Key frame distance changed from 53 to
> 191.
> 2012-05-20 08:34:42.236107 I  AFD: Key frame distance changed from 191 to
> 41.
> 2012-05-20 08:34:43.116450 I  Player(0): FPS:   25.01 Mean: 39989 Std.Dev:
>   102 CPUs: 0% 0%
> 2012-05-20 08:34:43.839227 I  AFD: Key frame distance changed from 41 to
> 40.
> 2012-05-20 08:34:45.276116 I  AFD: Key frame distance changed from 40 to
> 36.
> 2012-05-20 08:34:47.116505 I  Player(0): FPS:   25.01 Mean: 39988 Std.Dev:
>   101 CPUs: 0% 1%
> 2012-05-20 08:34:47.521747 I  AFD: Key frame distance changed from 36 to
> 56.
> 2012-05-20 08:34:51.035625 I  Player(0): 8000 progressive frames seen.
> 2012-05-20 08:34:51.116503 I  Player(0): FPS:   25.01 Mean: 39988 Std.Dev:
>   117 CPUs: 0% 1%
>
> How can I further diagnose what the issue might be?
>
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