vaapih264enc fail on simple pipeline

[LC]

Hi. 

Is there anyone having problem with this simple pipeline ? 
gst-launch-1.0 -ev videotestsrc num-buffers=60 ! vaapih264enc ! mp4mux !
filesink location=test.mp4 obtained from 
https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-vaapi-plugins/html/gstreamer-vaapi-plugins-vaapih264enc.html.

Only vaapih264enc does not work for me. 

libva info: VA-API version 0.39.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/nvidia_drv_video.so
libva info: Found init function __vaDriverInit_0_39
libva info: va_openDriver() returns 0
Pipeline is PREROLLING ...
Got context from element 'vaapiencodeh264-0': gst.vaapi.Display=context,
gst.vaapi.Display=(GstVaapiDisplay)NULL;
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0.GstPad:src: caps =
"video/x-raw\,\ width\=\(int\)320\,\ height\=\(int\)240\,\
framerate\=\(fraction\)30/1\,\ format\=\(string\)I420\,\
interlace-mode\=\(string\)progressive\,\
pixel-aspect-ratio\=\(fraction\)1/1"
ERROR: from element /GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
Internal data flow error.
Additional debug info:
gstbasesrc.c(2948): gst_base_src_loop ():
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0:
streaming task paused, reason not-negotiated (-4)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
/GstPipeline:pipeline0/GstMP4Mux:mp4mux0.GstPad:src: caps =
"video/quicktime\,\ variant\=\(string\)iso"
/GstPipeline:pipeline0/GstMP4Mux:mp4mux0.GstPad:src: caps = "NULL"
/GstPipeline:pipeline0/GstVideoTestSrc:videotestsrc0.GstPad:src: caps =
"NULL"

vainfo
libva info: VA-API version 0.39.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/nvidia_drv_video.so
libva info: Found init function __vaDriverInit_0_39
libva info: va_openDriver() returns 0
vainfo: VA-API version: 0.39 (libva 1.7.0)
vainfo: Driver version: Splitted-Desktop Systems VDPAU backend for VA-API -
0.7.4
vainfo: Supported profile and entrypoints
      VAProfileMPEG2Simple            : VAEntrypointVLD
      VAProfileMPEG2Main              : VAEntrypointVLD
      VAProfileMPEG4Simple            : VAEntrypointVLD
      VAProfileMPEG4AdvancedSimple    : VAEntrypointVLD
      VAProfileH264Baseline           : VAEntrypointVLD
      VAProfileH264Main               : VAEntrypointVLD
      VAProfileH264High               : VAEntrypointVLD
      VAProfileVC1Simple              : VAEntrypointVLD
      VAProfileVC1Main                : VAEntrypointVLD
      VAProfileVC1Advanced            : VAEntrypointVLD

And i use: NVIDIA Corporation GM107 [GeForce GTX 750 Ti]. 


Thanks! 




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