Re: /bsd: uvideo0: could not SET probe request: STALLED

On Tue, Dec 27, 2022 at 07:14:46PM +0100, Bodie wrote:

[...]

> You may find this interesting:
>
> https://www.usb.org/documents?search=video&category%5B%5D=49&type%5B%5D=55&items_per_page=50
>
> 4.3.1.1 Video Probe and Commit Controls
> The streaming parameters selection process is based on a shared negotiation model between the
> host and the video streaming interface, taking into account the following features:
> - shared nature of the USB
> - interdependency of streaming parameters
> - payload independence
> - modification of streaming parameters during streaming
> This negotiation model is supported by the Video Probe and Commit controls. The Probe control
> allows retrieval and negotiation of streaming parameters. When an acceptable combination of
> streaming parameters has been obtained, the Commit control is used to configure the hardware
> with the negotiated parameters from the Probe control.
>
> Based on issues reported in Linux with various camera often pointing
> to too big bandwith and fixing the problem with setting up
> different stream size you may try to play with settings over
> video(1) to set different formats for your stream as Chrome-based
> browsers are probably trying to set camera differently then FF
> (but is just my guess really based on info so far plus those
> specs documents describing STALL protocol as well)

Thank you again, quite relevant! So I will try to play with different
settings to see what happens. Hopefully, I will succeed. In any case
I will report here the results.

I am truly grateful for your time.

-- Robert