[Libva] Fwd: Problem about VAAPI gstreamer plugins

Engin FIRAT engin.firat at adonissyazilim.com
Mon Sep 29 06:51:00 PDT 2014

We have been trying to play a video streaming through a RTSP server by
using vaapidecode and vaapisink gstreamer elements. But the problem is
pipeline constructed seems problematic and it does not work. Here is the

*gst-launch-1.0 rtspsrc
<>  ! rtph264depay !
vaapidecode ! vaapisink*

The error message is as follows:

*gstbasesrc.c(2865): gst_base_src_loop ():

*streaming task paused, reason not-linked (-1)*

And moreover this is the output of the gst-launch:

*libva info: VA-API version 0.35.1*

*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_35*

*libva info: va_openDriver() returns 0*

*Setting pipeline to PAUSED ...*

*Pipeline is live and does not need PREROLL ...*

*Got context from element 'vaapidecode0': gst.vaapi.Display=context,

*Progress: (open) Opening Stream*

*Progress: (connect) Connecting to

*Progress: (open) Retrieving server options*

*Progress: (open) Retrieving media info*

*Progress: (request) SETUP stream 0*

*Progress: (request) SETUP stream 1*

*Progress: (open) Opened Stream*

*Setting pipeline to PLAYING ...*

*New clock: GstSystemClock*

*Progress: (request) Sending PLAY request*

*Progress: (request) Sending PLAY request*

*Progress: (request) Sent PLAY request*

*ERROR: from element
/GstPipeline:pipeline0/GstRTSPSrc:camera/GstUDPSrc:udpsrc3: Internal data
flow error.*

*Additional debug info:*

*gstbasesrc.c(2865): gst_base_src_loop ():

*streaming task paused, reason not-linked (-1)*

*Execution ended after 0:00:00.704377971*

*Setting pipeline to PAUSED ...*

*Setting pipeline to READY ...*

We think we should place a capsfilter before decode element but it did not
work too. In addition we have placed demuxer elements for an rtsp stream
such as: rtpptdemux but these did not even work.

We are sure, vaapidecode and vaapisink elements are working properly. For
example, following pipeline decodes a 1080p movie on GPU without any

*gst-launch-1.0 filesrc location=/my/file/location ! qtdemux ! vaapidecode
! vaapisink*

For those who think there may be a problem with RTSP content the following
pipeline also works without any problems:

*gst-launch-1.0 rtspsrc
<>  ! rtph264depay !
avdec_h264 ! xvimagesink sync=false*

We are working on an Intel E3845 processor. We are on Ubuntu 14.04 LTS OS
and driver version is as follows:

libva-intel-vaapi-driver and version: 1.3.0-1ubuntu1. Gstreamer vaapi
element's name and version is as follows: libgstreamer-vaapi1.0-0 and
version: 0.5.7-0ubuntu4

Could you please help to decode an rtsp stream on GPU by using gstreamer
vaapi plugins?


*Engin FIRAT*
Adoniss Yazılım Bilişim
Elektronik Araştırma Geliştirme
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+90 506 884 82 07 (Mobile)
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