On Mon, Sep 21, 2020 at 05:44:17PM +0200, Jan Stary wrote: Hello Jan,
> Presumably, as the default -s size is picked, and the camera cannot do 30 > fps in that size, -r 20 is chosen instead. > > If that's correct, the default size in effect overrides a specified rate. > Is that intended? > > It doesn't seem to be the least surprise: the command line specifies the > rate, and doesn't care about the size. > > Would it be preferable if video(1) chose -s 640x360 in that case, at 30 > fps, obeying the command line option? IMHO, there's no way to not surprise users: users (naively, if reasonably) want both big sizes and high frame rates, but that's generally impractical for (uncompressed) YUY2. It *might* be more reasonable to throw an error if everything specified can't be delivered. However, there's a probably deeper point here. IMHO, video(1) isn't really a sensible tool for viewing or recording video as it can't access a camera's MJPEG mode (assuming the camera has one!) without ld tricks. In general, I suggest that people use ffplay/ffmpeg (or something similar). Stefan Hagen has been trying to put together an FAQ entry explaining webcam use on OpenBSD [1]. Laurie [1] https://marc.info/?l=openbsd-tech&m=160053691513681&w=2
