So I can record good sound from the camera with this command to a wav file but I can't make arecord stop at 10 seconds: arecord -d 10 -t wav -D plughw:CARD=C920,DEV=0 -f cd -max-file-time 10 recordcam. Unfortunately with this recipe, you'll need to Ctrl-C after 10 seconds. On testing the camera's audio, I recorded and listened to the WAV file I recorded to the Pi's local storage. Now, I found the name "plughw:CARD=C920,DEV=0" which arecord described as "Hardware device with all software conversions"
To test audio you can try to use alsa's arecord. The audio was more difficult than the video. the playback URL in VLC is "rtsp://' -v C920 HD Pro Webcam Full HD 1080p video calling with stereo audio C920 delivers remarkably crisp and detailed Full HD video with a full HD glass lens, 78 field of view, and HD auto light correctionplus dual mics for clear stereo sound.I can decode the video on VLC on Mac (v2.2.4).OK, to use the Video4Linux2 driver to find the camera's video device do this: v4l2-ctl -list-devices I may be able to shed some light but also provide documentation and experience to other users.
I spent a number of hours recently with my C920 and a Raspberry Pi 3 recently to make a bab圜am that I could stream within my home network.
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