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From: Hans Petter Selasky <hselasky@c2i.net>
To: freebsd-usb@freebsd.org
Subject: Re: isochronous transfer for UVC camera
Date: Mon, 29 Oct 2012 14:36:08 +0100
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On Monday 29 October 2012 13:54:34 SAITOU Toshihide wrote:
> #define PKT_LEN        0x1400

Hi,

The packet length is not this value I think.

The 0x1000 is part of the packet multiplier for High-Speed USB's 
wMaxPacketSize.

It is (1+2) * 0x400. Try that and see what happens.

Also there is usbdump -i usbusX -f Y -s 65536 -vvv, which will show the actual 
traffic.

--HPS