[mythtv-users] Brief video judder during playback

[David Farmer]

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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