Hi, Hans de Goede wrote: > [snip] > > About the usb control msg errors, I don't think they are related to this issue at all, no real > world app ever does a streamon and an mmap at the same time. As said if we could serialize mmap and > ioctl at a high enough level, things would be fine too. I am using http://moinejf.free.fr/svv.c . In the start_capturing() function it calls the VIDIOC_STREAMON ioctl in case of memory mapped mode. Is this wrong? Or do you mean under "at the same time" that VIDIOC_STREAMON and mmap() is called from different tasks/threads? Regards, Márton Németh -- 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