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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 ...
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
Show activity on this post. There are some spare or reserved fields in the v4l2 buffers that can be used to pass audio or other data from the driver to the calling application via pointers to mmaped buffers. I modified the BT8x8 driver to use this approach to pass data from an A/D card synchronized to the video on Ubuntu 6.06.
1.10. Extended Controls — The Linux Kernel documentation
https://www.kernel.org/doc/html/v4.8/media/uapi/v4l/extended-controls.html
V4L2_CID_MPEG_AUDIO_CRC (enum v4l2_mpeg_audio_crc) CRC method. Possible values are: V4L2_MPEG_AUDIO_CRC_NONE: None: V4L2_MPEG_AUDIO_CRC_CRC16: 16 bit parity check: V4L2_CID_MPEG_AUDIO_MUTE (boolean) Mutes the audio when capturing. This is not done by muting audio hardware, which can still produce a slight hiss, but in the encoder itself ...
An Introduction to the Video4Linux Framework
https://elinux.org/images/8/89/V4l2-frameworks_0.pdf
v4l2_device_(un)register should have been called v4l2_root_init/exit.
1.12. V4L2 Controls — The Linux Kernel documentation
https://www.kernel.org/doc/html/v4.10/media/kapi/v4l2-controls.html
V4L2 Controls — The Linux Kernel documentation. 1.12. V4L2 Controls. ¶. 1.12.1. Introduction. ¶. The V4L2 control API seems simple enough, but quickly becomes very hard to implement correctly in drivers. But much of the code needed to handle controls is actually not driver specific and can be moved to the V4L core framework.
v4l2 capture example · GitHub
https://gist.github.com/maxlapshin/1253534
v4l2 capture example. GitHub Gist: instantly share code, notes, and snippets.
v4l2: The device does not support the streaming I/O method.
https://linux-media.vger.kernel.narkive.com/GTRrLhTt/v4l2-the-device-does-not-support-the-streaming-i-o-method
The ivtv driver does not support the V4L2 Streaming I/O ioctl ()'s for. transferring video data buffers. It only supports the read ()/write () calls. I'm not sure about ffmpeg, but mplayer is happy to read () the mpeg. stream from standard input or the device node: # cat /dev/video0 | mplayer. or. # mplayer /dev/video0.
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