I built a camera out of a Raspberry Pi and added a microphone. https://lambiaselightindustries.com/raspberry-pi-outdoor-security-camera-build-overview/
This command works great with the camera and streams to YT at 30 fps: ffmpeg -hide_banner -ar 44100 -ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f video4linux2 -input_format h264 -video_size 1280x720 -framerate 30 -i /dev/video0 -vcodec copy -acodec aac -ab 128k -g 50 -strict experimental -f flv rtmp://a.rtmp.youtube.com/live/xxxxxxxxxxxxxx But notice the audio is nulled out. I found two resources that seem to indicate how to get ffmepg to grab an alsa device: https://ffmpeg.org/ffmpeg-devices.html#alsa https://trac.ffmpeg.org/wiki/Capture/ALSA Listing my capture devices shows this: pi@cam-08:~/scripts $ arecord -l **** List of CAPTURE Hardware Devices **** card 1: sndrpii2scard [snd_rpi_i2s_card], device 0: simple-card_codec_link snd-soc-dummy-dai-0 [simple-card_codec_link snd-soc-dummy-dai-0] Subdevices: 1/1 Subdevice #0: subdevice #0 pi@cam-08:~/scripts $ arecord -L null Discard all samples (playback) or generate zero samples (capture) dmic_hw dmic_sv default sysdefault:CARD=sndrpii2scard snd_rpi_i2s_card, simple-card_codec_link snd-soc-dummy-dai-0 Default Audio Device dmix:CARD=sndrpii2scard,DEV=0 snd_rpi_i2s_card, simple-card_codec_link snd-soc-dummy-dai-0 Direct sample mixing device dsnoop:CARD=sndrpii2scard,DEV=0 snd_rpi_i2s_card, simple-card_codec_link snd-soc-dummy-dai-0 Direct sample snooping device hw:CARD=sndrpii2scard,DEV=0 snd_rpi_i2s_card, simple-card_codec_link snd-soc-dummy-dai-0 Direct hardware device without any conversions plughw:CARD=sndrpii2scard,DEV=0 snd_rpi_i2s_card, simple-card_codec_link snd-soc-dummy-dai-0 Hardware device with all software conversions Using 'arecord' I am able to record audio. I have a .asoundrc file in my home dir and reference the device by the name in there ("-D dmic_sv"). But, when I try to record with ffmpeg, nothing. If I use the device "hw:0" it fails, but if I used the device "sysdefault:CARD=sndrpii2scard" I do not get an error, but it does not record output. Here is the output of my ffmpeg commands. And assistance or hints appreciated. pi@cam-08:~/scripts $ ffmpeg -hide_banner -f alsa -channels 1 -sample_rate 44100 -i hw:0 -t 30 out.wav [alsa @ 0x1997210] cannot open audio device hw:0 (No such file or directory) hw:0: Input/output error pi@cam-08:~/scripts $ ffmpeg -hide_banner -f alsa -channels 1 -sample_rate 44100 -i sysdefault:CARD=sndrpii2scard -t 30 out.wav Guessed Channel Layout for Input Stream #0.0 : mono Input #0, alsa, from 'sysdefault:CARD=sndrpii2scard': Duration: N/A, start: 1643579124.318478, bitrate: 705 kb/s Stream #0:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s Stream mapping: Stream #0:0 -> #0:0 (pcm_s16le (native) -> pcm_s16le (native)) Press [q] to stop, [?] for help Output #0, wav, to 'out.wav': Metadata: ISFT : Lavf58.20.100 Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, mono, s16, 705 kb/s Metadata: encoder : Lavc58.35.100 pcm_s16le size= 2584kB time=00:00:30.00 bitrate= 705.6kbits/s speed= 1x video:0kB audio:2584kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.002948% Again, I get a file, but when I play it it seems to have no audio. Thanks in advance. _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
