On Tuesday, September 28, 2021 12:47:17 PM CEST, mnieuw--- via Cin wrote:
- I would avoid plug-in cards, you are completely dependent on the
manufacturer's support for Linux drivers. On the other hand, USB
grabbers usually follow standard USB audio/video rules, and almost
always work.
Your argument is valid for drivers in Linux. The problem with the USB
drivers and Linux;
- Linux supports a single endpoint per device, when the device needs two
independent drivers this causes a problem. For example V4L + libusb with
an ATEM.
- You want grabbing in uncompressed 4:2:2 format (4:4:4 does not make
much sense for PAL), the datastream is no problem for even USB2 .
- The bus speed can be saturated
- ISO transport is notoriously bad
I own a very great audio device (YellowTec Puc2) works very well, but I
would not connect it to a system with a shared USB bus.
- CinGG did not work with my then Easycap grabber, because it could not
switch it to PAL, and the default after plugging it in was NTSC.
However, this was a bug in CinGG, VLC worked fine with the same
device. I did some work on it but never finished it, lack of time.
v4l2-ctl to the rescue :)
--
Stefan
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