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C779
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3. Use the following command to set
v4l2-ctl --set-dv-bt-timings query
4. Use gstreamer to save video and audio(<ref>C779 DOESN'T support only supports video, not audio)</ref>
gst-launch-1.0 v4l2src io-mode=5 ! video/x-raw, format=UYVY, framerate=25/1 ! v4l2h264enc output-io-mode=4 ! video/x-h264,profile=high ! h264parse ! queue ! matroskamux name=mux ! filesink location=foo.mkv alsasrc device=hw:1 ! audio/x-raw,rate=48000,channels=2 ! audioconvert ! avenc_aac bitrate=48000 ! aacparse ! queue ! mux.