On Thursday 19 April 2012 21:34:54 Yuri wrote: > I am trying to use usbdump(8) on one webcam, but the produced, log > causes some questions. >
Hi, > 1. Why -s 1024 option doesn't show actual data even though SLEN for > packets is non-zero? The -s option must be set bigger than the maximum total data in a USB transfer, else you will only get parts of the data. Typical value: 65536 > 2. When I run webcamd, first 4 lines of log (with the error) quickly > appear. Webcamd exits quickly, in 0.035s, but usbdump after 1-2 secs > shows the rest of the log. Why is this significant delay? Why the first > 4 lines aren't delayed? Because usbdump uses a big buffer, which is only returned when it is filled up or when a 1 second timeout triggers. --HPS _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "[email protected]"
