HDMI to USB Video Capture Card 1080P: http://ebay.us/Mv0snK (eBay Affiliate)
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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 PulseAudio Sources
ffmpeg -sources pulse
Display Video from HDMI Capture Card using FFplay (720p 60fps)
ffplay -f v4l2 -input_format mjpeg -video_size 1280x720 -framerate 60 -i /dev/video0
Display Video from HDMI Capture Card using FFplay (1080p 30fps)
ffplay -f v4l2 -input_format mjpeg -video_size 1920x1080 -framerate 30 -i /dev/video0
Play Audio from HDMI Capture Card using FFplay
ffplay -f pulse -i default
Capture Audio and Video to AVI File (720p 60fps, no re-encoding)
ffmpeg -f v4l2 -thread_queue_size 1024 -input_format mjpeg -video_size 1280x720 -framerate 60 -i /dev/video0 -f pulse -thread_queue_size 1024 -i default -codec copy vid_720p_60.avi
Capture Audio and Video to AVI File (1080p 30fps, no re-encoding)
ffmpeg -f v4l2 -thread_queue_size 1024 -input_format mjpeg -video_size 1920x1080 -framerate 30 -i /dev/video0 -f pulse -thread_queue_size 1024 -i default -codec copy vid_1080p_30.avi
Convert avi to mp4 (hardware encoding)
ffmpeg -i vid_720p_60.avi -vcodec h264_omx -acodec aac -b:v 9500k -pix_fmt yuv420p vid.mp4
Convert avi to mp4 (software encoding)
ffmpeg -i vid_720p_60.avi -vcodec libx264 -acodec aac -b:v 9500k -pix_fmt yuv420p vid.mp4
Play mp4 with Hardware Decoding
omxplayer vid.mp4