Hi, > Frame rates usually decrease with the resolution. The limiting factor is quite > often not USB bandwidth (as MJPEG compression would allow to stream > 1280x1...@40fps quite easily over a USB 2.0 link) but sensor capabilities. > Without looking at the camera UVC descriptors I can't tell what frame rates it > really supports at 1280x1024, but I don't expect more than 15fps (if not > 10fps). >
>From what I experience in most cameras higher resolutions are only available in yuv format, this means that usb is also a limiting factor and in most cases you also have audio alongside the video stream. I guess hardware high resolution MJPEG compression is just a bit expensive for consumer grade cameras were price is a very important factor. This is probably the same reason why you can't find MPEG4 webcams. HD is mostly used for still image captures were fps is not very important. In any case even with a camera that supports HD compression you would need a very fast sensor/VPU in order to get that kind of frame rates but this would just make the camera price uncompetitive. Best regards, Paulo _______________________________________________ Linux-uvc-devel mailing list [email protected] https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
