Additional information related to my first message.
Building with gcc produces no trace of avfoundation support in full help.
Building with clang shows...
AVFoundation input device AVOptions:
-list_devices <int> .D...... list available devices (from 0 to 1)
(default 0)
true .D......
false .D......
-video_device_index <int> .D...... select video device by index for
devices with same name (starts at 0) (from -1 to INT_MAX) (default -1)
-pixel_format <pix_fmt> .D...... set pixel format (default yuv420p)
So many avfoundation is referenced through some sort of
Libavfilter incantation.
https://trac.ffmpeg.org/wiki/Capture/Webcam suggest no + maybe the docs
are just missing some vital bit of information to use avfoundation.
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