[mythtv-users] h264 playback artifacts

[Greg Oliver]

On Sat, Jan 1, 2011 at 4:47 PM, Rune Evjen <rune.evjen at gmail.com> wrote:
> 2011/1/1 Shawn King <slackerlinux85 at gmail.com>
>>
>> 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
>>
>> _______________________________________________
>> mythtv-users mailing list
>> mythtv-users at mythtv.org
>> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>>
>>
>> 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
>>
>> _______________________________________________
>> mythtv-users mailing list
>> mythtv-users at mythtv.org
>> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>>
>
> Thank you Shawn,
>
> unfortunately vdpaubuffersize=30 did not help much, but it was nice to
> narrow it down to the recording itself and not any video playback
> spesific issue, especially since my frontend (Zotac ION2) doesn't have
> the cpu power for non-vdpau playback.

I just discovered this morning that recordings I have used
mythvidexport.py to send to mythvideo all display the "blocks" like
this when I seek in them.  I have not had time to play with the
cutlist and seeklist options for it, but re-running the commflagger to
generate a new seektable fixed it right up.  I only see the artifacts
on 264 recordings though (hdpvr)..