On Tue Dec 27, 2022 at 7:38 PM CET, Robert Alessi wrote: > 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. >
This one may help a little too https://community.silabs.com/s/article/the-role-of-stall-handshake-packet-in-usb-transfer?language=en_US > I am truly grateful for your time. > > -- Robert
