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

[Thornton, Keith]

Hi,
I Think you will find that all decoders have to decode all the frames. Afterwards you could put a pad_probe on the decoders video src pad and drop two out of three frames
Grüße 

-----Ursprüngliche Nachricht-----
Von: gstreamer-devel <gstreamer-devel-bounces at lists.freedesktop.org> Im Auftrag von kmliu
Gesendet: Freitag, 2. August 2019 01:25
An: gstreamer-devel at lists.freedesktop.org
Betreff: VAAPI: How to reduce fps of decoded video being copied out of graphics memory?

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/
_______________________________________________
gstreamer-devel mailing list
gstreamer-devel at lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel