[mythtv-users] MythTV Raspberry Pi2 frontend testers

Dan Wilga mythtv-users2 at dwilga-linux1.amherst.edu
Mon Nov 30 19:19:42 UTC 2015


On 11/30/15 2:02 PM, Lawrence Rust wrote:
> On Sat, 2015-11-28 at 11:39 -0500, Peter Bennett (cats22) wrote:
>> On 11/27/2015 03:46 PM, Lawrence Rust wrote:
>>> I'm missing something. I've tested a number of videos, monitors &
>>> resolutions and haven't see any jerkiness with eglfs playback. So a
>>> small favour, would you run a test with the most jerky video that you
>>> have and post me the mythfrontend log with '-v playback --loglevel
>>> debug' args. It would also be extremely useful to test a video that
>>> causes problems so is it possible to download it from somewhere?
>> Mythfrontend log with those parameters is here
>> https://dl.dropboxusercontent.com/u/45325311/mythfrontend.log
>> This is on the 1280x1280 DVI screen and analog audio. First build (I did
>> not yet install the new build from today).
>> In that log, I played the recording from timestamp 11:22:52 to 11:23:22.
>> During that 30 seconds the audio is choppy and the video jerky.
>>
>> The recording is many Gigabytes, so I extracted the first 2 minutes
>> using ffmpeg. This only extracts video and one audio track, no sub
>> titles. Playing this 2 minute video through Mythtv Videos gives the same
>> jerkiness.
>> The file is here
>> https://dl.dropboxusercontent.com/u/45325311/News_Extract_2min.mpg
> Peter,
>
> Many thanks for the logfile and recording.  I can now reproduce the
> jerkiness that you describe.
>
> Unfortunately, it would appear that the problem is largely h/w related.
> The recording is MPEG2 1920x1080i 30Hz which is saturating the GPU.  The
> key point is the log lines 'Waiting for video buffers' which indicate
> GPU overload.
If all else fails, it might be viable for some users, especially those 
with more modern TVs, to have Myth output at 30 Hz refresh and have the 
TV deinterlace instead of the Pi2. Tvs these days are doing a better and 
better job of it.


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