no audio from i2s-mems breakout about pikrellcam HOT 6 CLOSED

When a video is recorded with the mic on, look at the log for a record stop line and see if numbers are given for audio frames and audio rate. If you have good audio frames numbers it means data was being read from the alsa interface. If so is there any chance the audio could be muted when pikrellcam opens the mic? Run amixer or alsamixer while pikrellcam has the mic open and see if anything about mute or capture level looks suspicious. For the audio frames number, the log will have a line like: Manual record stop (size:3.9MB < /tmp:275.4MB) vid_time:7.75 vid_fps:24.00 audio_frames:371973 audio_rate: 48000 where the audio_rate times recorded seconds should be close to the audio_frames. (eg 7.75 x 48000 close to 371973) Also, what info do you get when you run: arecord --dump-hw-params /dev/null This prints hw-params to the terminal and records audio into /dev/null so you have to ^C to quit the record. Bill

... pikrellcam is opening the device and reading data, so all I can think to do is to verify reading is from the correct device and that the set parameters are right. From cat /proc/asound/cards or running arecord -l, make sure the card number is right for the Adafruit card. For example, for me, I would do this for my USB sound card like so: $ cat /proc/asound/cards 0 [ALSA ]: bcm2835 - bcm2835 ALSA bcm2835 ALSA 1 [Device ]: USB-Audio - USB PnP Sound Device C-Media Electronics Inc. USB PnP Sound Device at usb-3f980 So my USB device is card 1 and so I will use plughw:1 and test run arecord with: $ arecord -d 2 -D plughw:1 -f S16_LE -r 24000 test.wav where I set the rate the same as you are using (24000) and set the format S16_LE which pikrellcam uses and record for 2 seconds. Make sure pikrellcam has the microphone closed and run the above arecord command and verify there is sound in test.wav to check that you can record audio from the mic with the same settings used by pikrellcam. Next, open the microphone in pikrellcam and run the above arecord again. It should error with: audio open error: Device or resource busy and this verifies that pikrellcam tries to use the same device. With the mic still open in pikrellcam, check the capture levels with aumix. I get $ amixer Simple mixer control 'Master',0 Capabilities: pvolume pswitch pswitch-joined Playback channels: Front Left - Front Right Limits: Playback 0 - 65536 Mono: Front Left: Playback 1805 [3%] [on] Front Right: Playback 1805 [3%] [on] Simple mixer control 'Capture',0 Capabilities: cvolume cswitch cswitch-joined Capture channels: Front Left - Front Right Limits: Capture 0 - 65536 Front Left: Capture 65536 [100%] [on] Front Right: Capture 65536 [100%] [on] which shows the "Capture" device is "on" with capture level 100%. To double check the Capture levels shown are for the right device, run alsamixer and with the F6 key make sure the Adafruit mic is selected and then hit F5 to show all controls. Make sure all "Mic" indicators show 100% and are not muted (mute is toggled with the "Space" key). For my USB card I show two "Mic" level bars and one of them can be muted and I have both set to 100%.

The differences are the rate and format, so try: arecord -d 2 -D plughw:1 -f S16_LE -r 48000 test.wav If that works then set the pikrellcam rate the same. Depending on if you have a Pi1 or Pi2, set in pikrellcam.conf audio_rate_Pi2 48000 and/or audio_rate_Pi1 48000 If that does not work, then it must be format. Unfortunately pikrellcam can't be configured to a S32_LE format. It would take adding some code to do that. It would be trivial to set ALSA to that but then the 32 bit .wav data has to be fed to lame to generate a .mp3 and offhand I'm not sure how much effort that would take. But I will say that the results of your arecord --dump-hw-params previously say that the Adafruit driver claims it supports S16_LE. If it does not then there is a bug there and maybe you could report to them that arecord -f S16_LE is not working. Or if it's the rate that's the problem, maybe some other rate than 48000 would work, maybe try 22050.