Yes it is workign with --stream-mmap. Also, it works when I use the buf.m.userptr that is initialized only once without updating it.
There is no update from you for a period, assuming this is not an issue any more.
Hence we are closing this topic. If need further support, please open a new one.
Thanks
Maybe your coding have problem for the V4L framework. Have you confirm your APP with Webcam or others platform?