On Mon, Feb 26, 2018 at 16:43:50 -0500, Lindsey Williams wrote: > "-r 1 " is just going to use the input file sampling rate, no?
Input file? We are talking about an input device (as this is a camera), and the term is "frame rate". "-r" should be "-framerate" for a v4l2 input, but "-r" works. It requests the driver to provide this framerate. The original poster used this in their command line. > "You need to check with V4L utilities or ffmpeg, which formats / > resolutions your v4l2 device provides. I would guess that docker gives you > only an abstraction (it's a kind of virtualization, right?)." > > Agree with that. Cameras are getting smaller and smaller.... and in order > to get away with that software is used on the the intake signal and > unwrapped/decompressed into larger resolutions as it goes to our screens. But physically, they provide a certain resolution via the wire. (Only the cra**y Windows drivers or apps upscale automatically, fooling the user into thinking there's a larger resolution, as printed on the box. But we're talking Linux here - no such issue from ffmpeg's/video4linux's point of view.) > The reason I suggested scaling is because you didn't complain about the > image not making sense... which means ffmpeg was able to decode the stream > and encode it into some format ( maybe not the ideal one. ) No, the issue the original poster was complaining about was that the camera delivers the desired resolution perfectly when accessing it from the bare operating system. When operating from with a docker container (some sort of virtualization) on the same machine, the device driver only presents a lower resolution. My guess: Either the default is different inside the docker, or the "virtualization" doesn't pass on the camera's full feature set, for whatever reason. Moritz _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
