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md5 output files, using dmabuf, are always different

Submitted by wangfei @wangfei

Link to original bug (#785616)

Description

Each time md5 get from Ubuntu UI mode is different. For example, I run the same h264 decode pipeline several times and get the different md5:

gst-launch-1.0 -q filesrc location=/media//yami_h264_Base_Ext_Main_profile/CABACI3_Sony_B.jsv '!' h264parse '!' vaapih264dec '!' vaapipostproc format=i420 '!' checksumsink2 frame-checksum=FALSE file-checksum=TRUE plane-checksum=FALSE

155495809127a6dd2c99c96b2ca8eae7

gst-launch-1.0 -q filesrc location=/media//yami_h264_Base_Ext_Main_profile/CABACI3_Sony_B.jsv '!' h264parse '!' vaapih264dec '!' vaapipostproc format=i420 '!' checksumsink2 frame-checksum=FALSE file-checksum=TRUE plane-checksum=FALSE

979beb55e43eee727e046414028d5f9d

#gst-launch-1.0 -q filesrc location=/media//yami_h264_Base_Ext_Main_profile/CABACI3_Sony_B.jsv '!' h264parse '!' vaapih264dec '!' vaapipostproc format=i420 '!' checksumsink2 frame-checksum=FALSE file-checksum=TRUE plane-checksum=FALSE
c586c2ccdd8bb1e202983ba56f734241