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FFmpeg Capture Notes: https://trac.ffmpeg.org/wiki/Capture/Webcam
Install v4l
sudo apt install v4l-utils
List Devices
v4l2-ctl --list-devices
List Modes
ffmpeg -f v4l2 -list_formats all -i /dev/video0
List Audio Devices
arecord -l
List PCMs
arecord -L
Display Video from HDMI Capture Card using FFplay
ffplay -f v4l2 -input_format mjpeg -video_size 1920x1080 -framerate 30 -i /dev/video0
Play Audio from HDMI Capture Card using FFplay
ffplay -f alsa -i plughw:CARD=Video,DEV=0
Install MPlayer
sudo apt install mplayer
Display Video from HDMI Capture Card using MPlayer
mplayer tv:// driver=v4l2:width=1920:height:1080:device=/dev/video0:fps=30
Attempt to Record Audio and Video to mp4
ffmpeg -f v4l2 -input_format mjpeg -video_size 1920x1080 -framerate 30 -i /dev/video0 -f alsa -i plughw:CARD=Video,DEV=0 vid.mp4
Attempt to Record Audio and Video to avi
ffmpeg -f v4l2 -input_format mjpeg -video_size 1920x1080 -framerate 30 -i /dev/video0 -f alsa -i plughw:CARD=Video,DEV=0 -codec copy vid.avi
Convert avi to mp4
ffmpeg -i vid.avi vid.mp4