Gstreamer VAAPI decoder plugins run much slower than software decoder plugins

[Wolfgang Grandegger]

Hello Nihit,

I wonder why you do not use:

... rtpjpegdepay ! vaapijpegdec ! vaapipostproc ! vaapisink

Likely, this will not speed up "vaapijpegdec", but the following
elements will use hardware acceleration as well.

Also, "buffer-size" seems very small. Try a value 10 times bigger, or
even more. And did you increase network buffering on the receiver and
sender side using:

  # sysctl net.core.rmem_max=16777216
  # sysctl net.core.wmem_max=16777216

Hope it helps,

Wolfgang.

Am 26.12.18 um 02:14 schrieb 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
> <mailto:lofy.stephen at gmail.com>> wrote:
> 
>     Hi,
>     Could you try to increase jpegparse between depay  and vaapijpegdecode?
> 
> 
> 
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