This is a follow up question to the thread “how to enable DMIC” https://devtalk.nvidia.com/default/topic/1029906/how-to-enable-dmic-and-get-data-to-alsa/#5239439
Thanks to Jon’s advice, I’m able to record the sound using DMIC (connecting thru the CSI expansion connector).
amixer -c tegrasndt186ref sset "ADMAIF2 Mux" DMIC3 arecord -D hw:tegrasndt186ref,1 -r 48000 -c2 -f S16_LE cap.wav
Now, when I tried to take the approach further to record MPEG video, I got no sound in the output.
gst-launch-1.0 nvcamerasrc sensor-id=1 ! 'video/x-raw(memory:NVMM), width=2592, height=1944, framerate=15/1, format=I420' ! nvvidconv flip-method=0 ! 'video/x-raw, width=960, height=960, framerate=15/1, format=I420' ! omxh264enc ! mpegtsmux name=mux alsasrc 'device=hw:tegrasndt186ref' ! audioresample ! audio/x-raw,rate=48000,channels=2 ! queue ! voaacenc bitrate=32000 ! queue ! mux. mux. ! filesink location=1cam_mix_audio.mpg sync=true async=false qos=true
There was a Warning about the GStreamer clock latency problem, but the video was still generated despite of it, but without sound.
Perhaps the way to define the ALSA source device was incorrect? Or there could be a better way to use GST for video+audio recording?
Please share your insight.
Many thanks in advance.