How to capture a yuv frame from h.264 stream

[glenne]

I am successfully receiving a stream on android via the following config to
hopefully get minimal latency:

rtspsrc location=rtsp://10.0.1.155:8554/test latency=0 ! rtpjitterbuffer
drop-on-latency=false latency=1 ! rtph264depay ! avdec_h264 ! videoconvert !
autovideosink sync=false

1. I would like to grab a yuv frame periodically to do some AR processing. 
What is the best way to grab a frame for processing?

2. Do these options make sense and are there suggestions for improvement? 
Do hw h.264 encoders automatically get utilized if present?


--
Glenn



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