On Wed, Jul 7, 2010 at 9:56 PM, Ivan <ivan.q.public@xxxxxxxxx> wrote: > I recently purchased ($20 special deal from newegg; the price has gone back > up) the following USB stick that captures composite video and S-video (no TV > tuner): > > KWORLD DVD Maker USB 2.0 (VS-USB2800) > > It seemed likely to be supported by the em28xx driver, and I'm pleased to > report that, in fact, it is! Yup, it's supported. > Does the em28xx driver load a firmware? No firmware is involved at all for this device. The Merlin ROM you are seeing is for other devices that use the same underlying driver. > Also, any firmware that gets loaded only persists until the device is > unplugged, right? And so my prior successful test on Windows has nothing to > do with my later success on Linux... just want to be sure about that. I also > tried testing with Windows in Virtualbox, but had no luck-- does anyone know > if this should be possible? (I can provide more info about my virtualbox > testing if anyone's interested.) Again, no firmware involved, and there is no transient state from Windows to Linux. Do a cold boot into Linux and you will see the device works fine. VirtualBox performs poorly with devices of this nature because the USB emulation isn't really designed for high-speed realtime delivery of video (and an uncompressed analog stream is about 20MB/sec). > I guess the part about the snapshot button means that I can use the push > button on the USB stick to trigger stuff if I want (yay!), but I have no > idea how to make that actually happen. If your device actually has a physical button on it then yes it will work. The driver will generate a "KEY_CAMERA" input event via inputdev (similar to a keyboard event). Read up on inputdev to see how to write a userland application which can see it. Cheers, Devin -- Devin J. Heitmueller - Kernel Labs http://www.kernellabs.com -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
