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linux - Can v4l2 be used to read audio and video from the ...
https://stackoverflow.com/questions/917060/can-v4l2-be-used-to-read-audio-and-video-from-the-same-device
IF you want your driver to play with gstreamer etc. a separate audio device generally is what is expected. Most of the cheap v4l2 capture card's audio is only an analog pass through with a volume control requiring a jumper to capture the audio via the sound card's line input. Share. Improve this answer.
Documentation:Modules/v4l2 - VideoLAN Wiki
https://wiki.videolan.org/Documentation:Modules/v4l2/
v4l2-stereo : Capture audio in stereo default value: enabled; v4l2-samplerate <integer> : Audio input sample rate in Hz default value: 48000; Tuner. v4l2-tuner <integer> : Tuner to use default value: 0; v4l2-tuner-frequency <integer> : Tuner frequency in Hz or MHz depending on the underlying v4l2 driver default value: -1; v4l2-tuner-audio-mode <integer> : Tuner audio mode …
v4l2 capture example · GitHub
https://gist.github.com/maxlapshin/1253534
type = V4L2_BUF_TYPE_VIDEO_CAPTURE; if (-1 == xioctl(fd, VIDIOC_STREAMON, &type)) errno_exit("VIDIOC_STREAMON"); break; case IO_METHOD_USERPTR: for (i = 0; i < n_buffers; …
V4L capturing - LinuxTVWiki
https://linuxtv.org/wiki/index.php/V4L_capturing
for VIDEO_DEVICE in /dev/video* ; do echo -e "\n\n$VIDEO_DEVICE\n" ; v4l2-ctl --device=$VIDEO_DEVICE --list-inputs ; done. Usually you will see e.g. a webcam with a single input and a TV card with multiple inputs. If you're still not sure which one you want, try each one in turn: mpv av://v4l2:<device> tv:///<whichever-input-number-you-connected> # or ... mpv --tv …
4.1. Video Capture Interface — The Linux Kernel …
https://www.kernel.org/doc/html/v4.10/media/uapi/v4l/dev-capture.html
Video Capture Interface. ¶. Video capture devices sample an analog video signal and store the digitized images in memory. Today nearly all devices can capture at full 25 or 30 frames/second. With this interface applications can control the capture process and move images from the driver into user space. Conventionally V4L2 video capture devices are accessed through character …
Capture images using V4L2 on Linux - Jay Rambhia’s Blog
https://jayrambhia.com/blog/capture-v4l2
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