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RaspberryPi HLS streaming with nginx and ffmpeg ; v4l2 error : ioctl(VIDIOC_STREAMON) : Protocol error
22 janvier 2021, par Mirco WeberI'm trying to realize a baby monitoring with a Raspberry Pi (Model 4B, 4GB RAM) and an ordinary Webcam (with integrated Mic).
I followed this Tutorial : https://github.com/DeTeam/webcam-stream/blob/master/Tutorial.md


Shortly described :


- 

- I installed and configured an nginx server with rtmp module enabled.
- I installed ffmpeg with this configuration —enable-gpl —enable-nonfree —enable-mmal —enable-omx-rpi
- I tried to stream ;)








The configuration of nginx seems to be working (sometimes streaming works, the server starts without any complication and when the server is up and running, the webpage is displayed).
The configuration of ffmpeg seems to be fine as well, since streaming sometimes works...


I was trying a couple of different ffmpeg-commands ; all of them are sometimes working and sometimes resulting in an error.
The command looks like following :


ffmpeg -re
-f v4l2
-i /dev/video0
-f alsa
-ac 1
-thread_queue_size 4096
-i hw:CARD=Camera,DEV=0
-profile:v high
-level:v 4.1
-vcodec h264_omx
-r 10
-b:v 512k
-s 640x360
-acodec aac
-strict
-2
-ac 2
-ab 32k
-ar 44100
-f flv
rtmp://localhost/show/stream;



Note : I rearranged the code to make it easier to read. In the terminal, it is all in one line.
Note : There is no difference when using
-f video4linux2
instead of-f v4l2


The camera is recognized by the system :


pi@raspberrypi:~ $ v4l2-ctl --list-devices
bcm2835-codec-decode (platform:bcm2835-codec):
 /dev/video10
 /dev/video11
 /dev/video12

bcm2835-isp (platform:bcm2835-isp):
 /dev/video13
 /dev/video14
 /dev/video15
 /dev/video16

HD Web Camera: HD Web Camera (usb-0000:01:00.0-1.2):
 /dev/video0
 /dev/video1



When only using
-i /dev/video0
, audio transmission never worked.
The output ofarecord -L
was :

pi@raspberrypi:~ $ arecord -L
default
 Playback/recording through the PulseAudio sound server
null
 Discard all samples (playback) or generate zero samples (capture)
jack
 JACK Audio Connection Kit
pulse
 PulseAudio Sound Server
usbstream:CARD=Headphones
 bcm2835 Headphones
 USB Stream Output
sysdefault:CARD=Camera
 HD Web Camera, USB Audio
 Default Audio Device
front:CARD=Camera,DEV=0
 HD Web Camera, USB Audio
 Front speakers
surround21:CARD=Camera,DEV=0
 HD Web Camera, USB Audio
 2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=Camera,DEV=0
 HD Web Camera, USB Audio
 4.0 Surround output to Front and Rear speakers
surround41:CARD=Camera,DEV=0
 HD Web Camera, USB Audio
 4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=Camera,DEV=0
 HD Web Camera, USB Audio
 5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=Camera,DEV=0
 HD Web Camera, USB Audio
 5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=Camera,DEV=0
 HD Web Camera, USB Audio
 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=Camera,DEV=0
 HD Web Camera, USB Audio
 IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=Camera,DEV=0
 HD Web Camera, USB Audio
 Direct sample mixing device
dsnoop:CARD=Camera,DEV=0
 HD Web Camera, USB Audio
 Direct sample snooping device
hw:CARD=Camera,DEV=0
 HD Web Camera, USB Audio
 Direct hardware device without any conversions
plughw:CARD=Camera,DEV=0
 HD Web Camera, USB Audio
 Hardware device with all software conversions
usbstream:CARD=Camera
 HD Web Camera
 USB Stream Output



that's why i added
-i hw:CARD=Camera,DEV=0
.

As mentioned above, it worked very well a couple of times with this configuration and commands.
But very often, i get the following error message when starting to stream :


pi@raspberrypi:~ $ ffmpeg -re -f video4linux2 -i /dev/video0 -f alsa -ac 1 -thread_queue_size 4096 -i hw:CARD=Camera,DEV=0 -profile:v high -level:v 4.1 -vcodec h264_omx -r 10 -b:v 512k -s 640x360 -acodec aac -strict -2 -ac 2 -ab 32k -ar 44100 -f flv rtmp://localhost/show/stream
ffmpeg version N-100673-g553eb07737 Copyright (c) 2000-2021 the FFmpeg developers
 built with gcc 8 (Raspbian 8.3.0-6+rpi1)
 configuration: --enable-gpl --enable-nonfree --enable-mmal --enable-omx-rpi --extra-ldflags=-latomic
 libavutil 56. 63.101 / 56. 63.101
 libavcodec 58.117.101 / 58.117.101
 libavformat 58. 65.101 / 58. 65.101
 libavdevice 58. 11.103 / 58. 11.103
 libavfilter 7. 96.100 / 7. 96.100
 libswscale 5. 8.100 / 5. 8.100
 libswresample 3. 8.100 / 3. 8.100
 libpostproc 55. 8.100 / 55. 8.100
[video4linux2,v4l2 @ 0x2ea4600] ioctl(VIDIOC_STREAMON): Protocol error
/dev/video0: Protocol error



And when I'm swithing to
/dev/video1
(since this was also an output forv4l2-ctl --list-devices
), I get the following error message :

pi@raspberrypi:~ $ ffmpeg -re -f v4l2 -i /dev/video1 -f alsa -ac 1 -thread_queue_size 4096 -i hw:CARD=Camera,DEV=0 -profile:v high -level:v 4.1 -vcodec h264_omx -r 10 -b:v 512k -s 640x360 -acodec aac -strict -2 -ac 2 -ab 32k -ar 44100 -f flv rtmp://localhost/show/stream
ffmpeg version N-100673-g553eb07737 Copyright (c) 2000-2021 the FFmpeg developers
 built with gcc 8 (Raspbian 8.3.0-6+rpi1)
 configuration: --enable-gpl --enable-nonfree --enable-mmal --enable-omx-rpi --extra-ldflags=-latomic
 libavutil 56. 63.101 / 56. 63.101
 libavcodec 58.117.101 / 58.117.101
 libavformat 58. 65.101 / 58. 65.101
 libavdevice 58. 11.103 / 58. 11.103
 libavfilter 7. 96.100 / 7. 96.100
 libswscale 5. 8.100 / 5. 8.100
 libswresample 3. 8.100 / 3. 8.100
 libpostproc 55. 8.100 / 55. 8.100
[video4linux2,v4l2 @ 0x1aa4610] ioctl(VIDIOC_G_INPUT): Inappropriate ioctl for device
/dev/video1: Inappropriate ioctl for device



When using the
video0
input, the webcam's LED that recognizes an access is constantly on. When usingvideo1
not.

After hours and days of googling and tears and whiskey, for the sake of my liver, my marriage and my physical and mental health, I'm very sincerly asking for your help...
What the f**k is happening and what can I do to make it work ???


Thanks everybody :)


UPDATE 1 :


- 

- using the full path to ffmpeg does not change anything...
- /dev/video0 and /dev/video1 have access rights for everybody
sudo ffmpeg ...
does not change anything as well- the problem seems to be at an "early stage". Stripping the command down to
ffmpeg -i /dev/video0
results in the same problem










UPDATE 2 :

It seems that everything is working when I first start another Application that needs access to the webcam and then ffmpeg...
Might be some driver issue, but when I'm looking for loaded modules withlsmod
, there is absolutely no change before and after I started the application...
Any help still appreciated...

UPDATE 3 :

I was checking the output ofdmesg
.

When I started the first application I received this message :

uvcvideo: Failed to query (GET_DEF) UVC control 12 on unit 2: -32 (exp. 4).


And when I startedffmpeg
, nothing happend but everything worked...

-
How do I stream audio from a mic in a raspberry pi with FFmpeg ?
23 mars 2024, par IgnacioI'm trying to follow this to stream audio from a mic in my raspberry pi.


ignacio@pi-satellite-bigbedroom:~ $ ffmpeg -re -f pulse -ac 1 -i plughw:CARD=seeed2micvoicec,DEV=0 -f rtsp -rtsp_transport tcp rtsp://192.168.86.151:8554/live.stream
ffmpeg version 4.3.6-0+deb11u1+rpt5 Copyright (c) 2000-2023 the FFmpeg developers
 built with gcc 10 (Debian 10.2.1-6)
 configuration: --prefix=/usr --extra-version=0+deb11u1+rpt5 --toolchain=hardened --incdir=/usr/include/aarch64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --disable-mmal --enable-neon --enable-v4l2-request --enable-libudev --enable-epoxy --enable-sand --libdir=/usr/lib/aarch64-linux-gnu --arch=arm64 --enable-pocketsphinx --enable-libdc1394 --enable-libdrm --enable-vout-drm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
 libavutil 56. 51.100 / 56. 51.100
 libavcodec 58. 91.100 / 58. 91.100
 libavformat 58. 45.100 / 58. 45.100
 libavdevice 58. 10.100 / 58. 10.100
 libavfilter 7. 85.100 / 7. 85.100
 libavresample 4. 0. 0 / 4. 0. 0
 libswscale 5. 7.100 / 5. 7.100
 libswresample 3. 7.100 / 3. 7.100
 libpostproc 55. 7.100 / 55. 7.100
plughw:CARD=seeed2micvoicec,DEV=0: No such process



I believe this shows the cards I have :


ignacio@pi-satellite-bigbedroom:~ $ pactl list sources
Source #0
 State: SUSPENDED
 Name: alsa_output.platform-bcm2835_audio.analog-stereo.monitor
 Description: Monitor of Built-in Audio Analog Stereo
 Driver: module-alsa-card.c
 Sample Specification: s16le 2ch 44100Hz
 Channel Map: front-left,front-right
 Owner Module: 4
 Mute: no
 Volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB
 balance 0.00
 Base Volume: 65536 / 100% / 0.00 dB
 Monitor of Sink: alsa_output.platform-bcm2835_audio.analog-stereo
 Latency: 0 usec, configured 0 usec
 Flags: DECIBEL_VOLUME LATENCY 
 Properties:
 device.description = "Monitor of Built-in Audio Analog Stereo"
 device.class = "monitor"
 alsa.card = "0"
 alsa.card_name = "bcm2835 Headphones"
 alsa.long_card_name = "bcm2835 Headphones"
 alsa.driver_name = "snd_bcm2835"
 device.bus_path = "platform-bcm2835_audio"
 sysfs.path = "/devices/platform/soc/3f00b840.mailbox/bcm2835_audio/sound/card0"
 device.form_factor = "internal"
 device.string = "0"
 module-udev-detect.discovered = "1"
 device.icon_name = "audio-card"
 Formats:
 pcm

Source #1
 State: IDLE
 Name: alsa_output.platform-soc_sound.stereo-fallback.monitor
 Description: Monitor of Built-in Audio Stereo
 Driver: module-alsa-card.c
 Sample Specification: s16le 2ch 44100Hz
 Channel Map: front-left,front-right
 Owner Module: 12
 Mute: no
 Volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB
 balance 0.00
 Base Volume: 65536 / 100% / 0.00 dB
 Monitor of Sink: alsa_output.platform-soc_sound.stereo-fallback
 Latency: 0 usec, configured 2000000 usec
 Flags: DECIBEL_VOLUME LATENCY 
 Properties:
 device.description = "Monitor of Built-in Audio Stereo"
 device.class = "monitor"
 alsa.card = "2"
 alsa.card_name = "seeed-2mic-voicecard"
 alsa.long_card_name = "seeed-2mic-voicecard"
 alsa.driver_name = "snd_soc_simple_card"
 device.bus_path = "platform-soc:sound"
 sysfs.path = "/devices/platform/soc/soc:sound/sound/card2"
 device.form_factor = "internal"
 device.string = "2"
 module-udev-detect.discovered = "1"
 device.icon_name = "audio-card"
 Formats:
 pcm

Source #2
 State: RUNNING
 Name: alsa_input.platform-soc_sound.stereo-fallback
 Description: Built-in Audio Stereo
 Driver: module-alsa-card.c
 Sample Specification: s16le 2ch 44100Hz
 Channel Map: front-left,front-right
 Owner Module: 12
 Mute: no
 Volume: front-left: 32845 / 50% / -18.00 dB, front-right: 32845 / 50% / -18.00 dB
 balance 0.00
 Base Volume: 20724 / 32% / -30.00 dB
 Monitor of Sink: n/a
 Latency: 688 usec, configured 10000 usec
 Flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY 
 Properties:
 alsa.resolution_bits = "16"
 device.api = "alsa"
 device.class = "sound"
 alsa.class = "generic"
 alsa.subclass = "generic-mix"
 alsa.name = "bcm2835-i2s-wm8960-hifi wm8960-hifi-0"
 alsa.id = "bcm2835-i2s-wm8960-hifi wm8960-hifi-0"
 alsa.subdevice = "0"
 alsa.subdevice_name = "subdevice #0"
 alsa.device = "0"
 alsa.card = "2"
 alsa.card_name = "seeed-2mic-voicecard"
 alsa.long_card_name = "seeed-2mic-voicecard"
 alsa.driver_name = "snd_soc_simple_card"
 device.bus_path = "platform-soc:sound"
 sysfs.path = "/devices/platform/soc/soc:sound/sound/card2"
 device.form_factor = "internal"
 device.string = "hw:2"
 device.buffering.buffer_size = "352800"
 device.buffering.fragment_size = "176400"
 device.access_mode = "mmap+timer"
 device.profile.name = "stereo-fallback"
 device.profile.description = "Stereo"
 device.description = "Built-in Audio Stereo"
 module-udev-detect.discovered = "1"
 device.icon_name = "audio-card"
 Ports:
 analog-input: Analog Input (type: Analog, priority: 10000, availability unknown)
 Active Port: analog-input
 Formats:
 pcm



I want to use the mic from the seeed-2mic-voicecard.


Thanks for the help