Hi. I've got a video capture that reads a video file and I'd like to process frames w/out delay. However, my measurements showed that VideoCapture::read() (or VideoCapture::grab()) is blocking -- the time it blocks is the delay between two frames for given framerate of the video.

I observed this on 2.4.11 with GStreamer backend and the delay is propagated from GStreamer pipeline. See explanation what emit-signals does and it is actually set to false in OpenCV.

Is the blocking behavior intended for video files? If so, is there a way how to batch-process a video file? (Unfortunately, setting CV_CAP_PROP_FPS doesn't work with GStreamer backend.)

Thanks.