[mythtv-users] Trylock has spun XX times - problems with .avi playback

[Mark Perkins]

> On 3 Oct 2014, at 2:27 am, "Andrey Zhunev" <a-j at a-j.ru> wrote:
> 
> Hello All,
> 
> I asked this question on the forum, but got only 10 views over the
> last 24 hours - so maybe the mailing list is more popular...
> 
> I'm running Myth 0.27.3 (build from a relatively fresh source) on a
> CentOS 6.4. I have an issue with internal player while playing back
> some .avi files. In some cases a video becomes "a slideshow" for a
> couple of seconds (lots of frames get dropped while audio still sounds
> smooth), then the playback continues normally. I think this happens
> only in places where the video was previously cut and 'glued' back
> together, so this looks to be an .avi file issue. But it only behaves
> this way when played by Myth's internal player. The same video file
> plays perfectly smooth in mplayer as well as several Windows-based
> players that I tried.
> 
> Also, I see exactly the same behavior on my backend/frontend machine
> running Intel video + VAAPI and on my dedicated frontend with an
> NVIDIA + VDPAU. Both machines are powerful enough to handle the task
> without being heavily loaded (the BE machine is a Core i7, SATA HDDs,
> plenty of RAM, etc.). So this does not seem to be something
> hardware-specific.
> 
> Whenever this happens, mythfrontend log shows 'TryLock has spun'
> followed by 'Video is XX frames ahead of audio'. Full log is here:
> http://pastebin.com/raw.php?i=vBRXeQ0u
> 
> The issue started long ago - I don't remember exactly when. I guess it
> first appeared when I switched from 0.26 to 0.27 (or maybe when Myth
> moved to using internal player by default). Now my wife complained
> about this issue - so I have to find a solution!
> 
> 
> 
> -- 
> Best regards,
> Andrey                    
> 
> _______________________________________________

Maybe try a demux / remux of one of your files to see if that cleans it up. I don't remember the ffmpeg switches (google will get you plenty of examples) but something like

ffmpeg -i infile -acodec copy -vcodec copy outfile