VAAPI: How to reduce fps of decoded video being copied out of graphics memory?

[Junyan He]

The videorate plugin seems just have transform_ip function and just
transform gstbuffer in place, will not copy the buffers. So it seems
will not generate copying memory from GPU(Graphic) to CPU. Are you sure
the memory copy generated?


On 四, 2019-08-01 at 18:24 -0500, kmliu wrote:
> I'm trying to use VAAPI to decode H.264 video from an IP camera and
> then
> export the raw frames out of graphics memory to main memory for some
> unspecified "further processing". Say the H.264 is 30fps but I only
> want to
> process 10fps. I can do something like this:
> 
> gst-launch-1.0 rtspsrc location=rtsp_uri ! rtph264depay !
> vaapih264dec !
> videorate ! "video/x-raw,framerate=10/1" ! filesink
> location=video.yuv
> 
> But this seems to first copy all 30fps from graphics memory and then
> lower
> it to 10fps. How can I reduce the fps of raw frames being copied out
> of
> graphics memory in the first place (to reduce memory bandwidth
> consumption)?
> 
> I have also tried this:
> 
> gst-launch-1.0 rtspsrc location=rtsp_uri ! rtph264depay !
> vaapih264dec !
> "video/x-raw,framerate=10/1" ! filesink location=video.yuv
> 
> and this:
> 
> gst-launch-1.0 rtspsrc location=rtsp_uri ! rtph264depay !
> vaapih264dec !
> "video/x-raw(memory:VASurface),framerate=10/1" ! filesink
> location=video.yuv
> 
> Neither seems to work. They both have the WARN message "GST_PADS:
> gst-pad.c:4226:gst_pad_peer_query:<vaapidecode_h264-0:src> could not
> send
> sticky events". And the output file video.yuv is empty.
> 
> 
> 
> 
> --
> Sent from: http://gstreamer-devel.966125.n4.nabble.com/
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