single frame snapshot

[Baby Octopus]

Pad probe is the option that you can use. Add a probe to the sink pad of
filesink and let only one buffer pass through the probe. Once sent, tell the
application to send EOS and shut the pipeline down

Another hacky option that you can try is this 

... ! videorate ! video/x-raw,framerate=1/10000000 ! filesink 

Videorate will send first frame and wait for next frame whcih is after a
long time. You can shutdown the pipeline in that time 



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