problem with vaapi

[Gofrane]

I replaced it 
 gst-launch-1.0 -t -v filesrc location=big_buck_bunny_1080p_h264.mov !
qtdemux !  vaapidecode !   "video/x-raw, width=640, height=480"  ! avimux !
filesink location=result-yuv.avi 


but also I got the error of the link between  vaapidecode and avimux 

libva info: VA-API version 0.36.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
libva info: Found init function __vaDriverInit_0_36
libva info: va_openDriver() returns 0
*WARNING: erroneous pipeline: could not link vaapidecode0 to avimux0*




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