gstreamer-vaapi: vaapidecode & vaapisink playback issues when scaling h264/mp4 videos

[Joe McDonald]

Some additional debug and tests that I've done.

I've discovered the proper way to scale in VAAPI (vaapipostproc...yay!) and
have resolved this issue.  Updated commands are as follows (for reference):

gst-launch-1.0 filesrc location= <filename>.mp4 ! qtdemux ! vaapidecode !
vaapipostproc width=640 ! vaapisink

For MPEG2 playback:
gst-launch-1.0 filesrc location= <filename>.mpg ! mpegpsdemux !
mpegvideoparse ! vaapidecode ! vaapisink
gst-launch-1.0 filesrc location= <filename>.ts ! tsdemux ! mpegvideoparse !
vaapidecode ! vaapisink

Hopefully if anyone else runs into this issue this will help.

Joe



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