Gstreamer VAAPI decoder plugins run much slower than software decoder plugins

[Nihit Mody]

Hi Stephen,

Thank you for your response. The sender pipeline is 1920x1080 @
60FPS. After doing some testing here are my results with VAAPIjpegdec:

Pipeline (1) Vaapijpegdec:

gst-launch-1.0 udpsrc port=5000 buffer-size=2000000 !
application/x-rtp,encoding-name=JPEG,payload=26 ! rtpjpegdepay !
vaapijpegdec ! videoconvert ! fpsdisplaysink text-overlay=true

yields 6.00 FPS

Pipeline (2) With Vaapijpegdec and Jpegparse between depay and vaapijpegdec:

gst-launch-1.0 udpsrc port=5000 buffer-size=2000000 !
application/x-rtp,encoding-name=JPEG,payload=26 ! rtpjpegdepay ! jpegparse
! vaapijpegdec ! videoconvert ! fpsdisplaysink text-overlay = true

yields 6.18 FPS

So I get a slight improvement of 0.18 FPS,

Here are the GstShark analysis results:

GstShark Analysis Pipeline (1) without jpegparse:

Proctime Analysis




Element Time (ns) Time (ms)
capsfilter 8830 0.00883
rtpjpegdepay0 505782 0.505782
vaapijpegdec0 6017591 6.017591
videoconvert0 50351 0.050351
GstShark Analysis Pipeline (2) with jpegparse:

Proctime Analysis




Element Time (ns) Time (ms)
capsfilter 15244 0.015244
rtpjpegdepay0 608405 0.608405
jpegparse0 1589129 1.589129
vaapijpegdec0 3160754 3.160754
videoconvert0 68940 0.06894
It seems the vaapijpegdec is able to perform the decode in 3.16ms vs almost
17ms for the software decoder (jpegdec) yet the framerate is 12.14 FPS so
almost double with the software decoder. Do you know why this could be?


On Sat, Dec 22, 2018 at 10:27 AM Stephenwei <lofy.stephen at gmail.com> wrote:

> Hi,
> Could you try to increase jpegparse between depay  and vaapijpegdecode?
>
>
>
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