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Documentation:Modules/v4l2 - VideoLAN Wiki
https://wiki.videolan.org/Documentation:Modules/v4l2/
These options do not apply to audio streams in compressed data. v4l2-adev < string > : Audio input device default value: "". v4l2-audio-method < integer > : Allowed audio input methods (bitmask: 1 for OSS, 2 for ALSA) default value: 3. v4l2-stereo : Capture audio in stereo default value: enabled. v4l2-samplerate < integer > : Audio input sample ...
1.5. Audio Inputs and Outputs — The Linux Kernel …
https://www.kernel.org/doc/html/v4.9/media/uapi/v4l/audio.html
Assumed two composite video inputs and two audio inputs exist, there may be up to four valid combinations. The relation of video and audio connectors is defined in the audioset field of the respective struct v4l2_input or struct v4l2_output, where each bit represents the index number, starting at zero, of one audio input or output.
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 …
7.1. Differences between V4L and V4L2 — The Linux …
https://www.kernel.org/doc/html/v4.9/media/uapi/v4l/diff-v4l.html
Related to audio modes struct v4l2_audio also reports if this is a mono or stereo input, regardless if the source is a tuner. The following fields where replaced by V4L2 controls accessible with the ioctls VIDIOC_QUERYCTRL, VIDIOC_QUERY_EXT_CTRL and VIDIOC_QUERYMENU , VIDIOC_G_CTRL and VIDIOC_S_CTRL ioctls:
Video for Linux Two API Specification
http://www.staroceans.org/documents/v4l2.pdf
Clarified the purpose of the audioset field in struct v4l2_input and v4l2_output. Revision 0.19 2006-10-19 Revised by: mhs Documented V4L2_PIX_FMT_RGB444. Revision 0.18 2006-10-18 Revised by: mhs Added the description of extended controls by Hans Verkuil. Linked V4L2_PIX_FMT_MPEG to V4L2_CID_MPEG_STREAM_TYPE. Revision 0.17 2006-10-12 Revised ...
An Introduction to the Video4Linux Framework
https://elinux.org/images/8/89/V4l2-frameworks_0.pdf
It has two inputs: input 0 is an S-Video input (SDTV) and input 1 is an HDMI input (HDTV) up to 74.25 MHz pixelclock. It supports the 4:2:2 YUYV image format.
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