[mythtv-users] h264 playback artifacts

[Shawn King]

On 01/02/2011 06:48 AM, Rune Evjen wrote:
> Hello,
>
> For some time (not exactly sure if this happended before or after 
> switching to .24) I have experienced artifacts ("blocky" picture and 
> some tearing) on some recordings.
>
> I have played around with vdpau and xorg options without success.
>
> I'm not sure whether this is vdpau related, mythtv related or a result 
> of result of errors in the video file.
>
> mythavtest shows amongst other thins a lot of these: "AFD: 
> HandleGopStart: Key frame distance changed from XX to XX." and I get 
> the feeling that these logged events correlate to the artifacts in the 
> video.
>
> A 150Mb sample of video is available here: 
> http://dl.dropbox.com/u/432335/sample.mpg
> and the output from mythavtest for the same video is available here: 
> http://dl.dropbox.com/u/432335/sample.mpg.log
>
> Mythtv version:
> Please attach all output as a file in bug reports.
> MythTV Version   : c548468
> MythTV Branch    : fixes/0.24
> Network Protocol : 63
> Library API      : 0.24.20101129-1
> QT Version       : 4.7.0
> Options compiled in:
>  linux debug using_alsa using_jack using_oss using_pulse 
> using_pulseoutput using_backend using_bindings_perl 
> using_bindings_python using_dvb using_firewire using_frontend 
> using_hdhomerun using_hdpvr using_iptv using_ivtv using_joystick_menu 
> using_lirc using_mheg using_opengl_video using_opengl_vsync 
> using_qtdbus using_qtwebkit using_v4l using_x11 using_xrandr using_xv 
> using_bindings_perl using_bindings_python using_mythtranscode 
> using_opengl using_vdpau using_ffmpeg_threads using_live using_mheg
>
>
> I hope somebody can help verify if this is related to mythtv, vdpau 
> playback errors or if there are errors in the video file itself.
>
> Best regards,
>
> Rune
>
>
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>    
tried your video it also shows the artifacts using the ffmpeg decoder 
w/out vdpau and in MPlayer

it seems to be a bad file/recording i doubt it will work for this 
recording but you could try setting vdpaubuffersize=30 in the filters 
section it was recomended in ticket #9311 and can fix some artifacts 
when using vdpau
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