[Bug 796467] msdk: the dumped file has garbage in every frame when decode the mpeg2 encoded file

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796467

--- Comment #1 from zj,wang <zhanjunx.wang at intel.com> ---
1. gst-launch-1.0 -f filesrc
location=/media/encoderbitstreams//720p5994_parkrun_ter.yuv '!' videoparse
format=i420 width=1280 height=720 framerate=30 '!' videoconvert '!'
video/x-raw,format=NV12 '!' msdkmpeg2enc rate-control=cqp qpi=26 qpp=26 qpb=26
gop-size=30 b-frames=0 '!' mpegvideoparse '!' mpegtsmux '!' filesink
location=./720p5994_parkrun_i420_profilemain_rc0_ip_qp26_slice1_gop30_fps30.mpg
2. gst-launch-1.0 -f -q filesrc
location=./720p5994_parkrun_i420_profilemain_rc0_ip_qp26_slice1_gop30_fps30.mpg
'!' mpegvideoparse '!' mfxmpeg2dec '!' videoconvert '!' ximagesink


mplayer ./720p5994_parkrun_i420_profilemain_rc0_ip_qp26_slice1_gop30_fps30.mpg

use mfx instead of msdk, it also has garbage
use mplayer to play the encoded file, the file can be palyed clearly.

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