[mythtv] 2019-devel: lipsync drift
johnpilk222 at gmail.com
Sun Nov 24 15:16:41 UTC 2019
On 23/11/2019 12:31, John Pilkington wrote:
> On 18/11/2019 11:58, Mark Kendall wrote:
>> On Mon, 18 Nov 2019 at 11:47, John Pilkington <johnpilk222 at gmail.com>
>>> I'm still getting loss of a/v sync in my el7 box, more noticeable in
>>> some recordings than others, but the fedora 30 system built at the same
>>> commit has not yet done the same, using either NVdec or ffmpeg decoding.
>> I'm assuming el7 is enterprise linux 7?
>> What decoder/playback settings is that box using?
>> Thanks, Mark
> My original reply to this revealed many opportunities for system
> misalignments that might be causing this drift, and I won't repeat them.
> But here are lines from frontend startup and closedown that look as if
> they are system specific and could perhaps underlie a slow drift if all
> the digits are significant and the usage isn't quite right.
> 2019-11-23 11:35:57.867339 I DispResX: Created
> 2019-11-23 11:35:57.867956 N DispRes: Desktop video mode: 1440x900
> 74.984 Hz
> 2019-11-23 11:49:27.987070 I DispRes: Changing to 1440x900 75.000 Hz
> 2019-11-23 11:49:28.013150 I DispRes: SwitchToGUI: Switched to 1440x900
> 75.000 Hz
> xrandr offers 59.89 + 74.98* at that (full) resolution of the only
> attached screen; I'm using a 1024x576 window
> The Std.Devs shown here look (unfeasibly?) large, and sync was very bad
> while getting them. The CPUs look busy. BBC Four SD. Playback is fine
> apart from the sync issue, and via DLNA on the TV it's excellent.
> 2019-11-23 12:11:19.873565 I Player(0): FPS: 25.88 Mean: 38642
> Std.Dev: 28904 CPUs: 101% 101%
> 2019-11-23 12:11:20.890110 I Player(0): FPS: 24.60 Mean: 40647
> Std.Dev: 25888 CPUs: 98% 97%
> 2019-11-23 12:11:21.903609 I Player(0): FPS: 24.67 Mean: 40528
> Std.Dev: 26322 CPUs: 104% 97%
> 2019-11-23 12:11:22.894285 I Player(0): FPS: 25.24 Mean: 39615
> Std.Dev: 25965 CPUs: 103% 102%
Here, FWIW, are the corresponding lines for the F30 box, which has an
nVidia card driving a VGA monitor and an HDMI TV, using a single image
surface; again, on the monitor mythTV is using a 1024x576 window.
2019-11-24 14:37:47.305471 I DispResX: Created
2019-11-24 14:37:47.306061 N DispRes: Desktop video mode: 3600x1080
2019-11-24 14:38:13.380206 I DispRes: Changing to 3600x1080 nan Hz
2019-11-24 14:38:13.380213 E DispResX: Desired resolution and frame
rate not found.
2019-11-24 14:38:13.380223 E DispRes: SwitchToGUI: xrandr failed for
3600x1080 50.000 Hz
2019-11-24 14:38:13.380234 I DispResX: Deleted
Screen 0: minimum 8 x 8, current 3600 x 1080, maximum 16384 x 16384
VGA-0 connected primary 1680x1050+0+0 (normal left inverted right x axis
y axis) 433mm x 271mm
HDMI-0 connected 1920x1080+1680+0 (normal left inverted right x axis y
axis) 698mm x 392mm
1920x1080 50.00*+ 60.00 59.94 23.98 60.05 60.00
I haven't noticed drift on either of those F30 screens, but won't say it
definitely isn't there. After a 1-hour uninterrupted playback in el7, I
got normal sync with a 3200 ms applied offset. Right ballpark...
Both running c794391ad
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