Hmm, MMAL_PARAM_TIMESTAMP_MODE_RESET_STC should work, but as you've noticed it isn't used by anything so regressions may have happened. I'll add it to the list of things to check. Hey! Sorry to have misstated the fact. MMAL_PARAM_TIMESTAMP_MODE_RESET_STC also worked flawlessly afterwards. I don't k...

Alright. Thanks a lot for the explanation of the randomness of the callback time. Also, I had previously set my timestamp mode to MMAL_PARAM_TIMESTAMP_MODE_RESET_STC and it always returned me MMAL_TIME_UNKNOWN until you suggested to try out MMAL_PARAM_TIMESTAMP_MODE_RAW_STC. It magically started wor...

Thanks a lot for clarifying that! I had also tried previously to synchronise the frame rate. I read all the posts above and most of the places you had mentioned to tweak the MMAL_PARAMETER_VIDEO_FRAME_RATE parameter. I have already assigned it a constrant value. Still I am getting significant deviat...

Hi all, I am working on capturing the frames in sync with a GPIO trigger. My requirement is that the picture should be captured either as soon as possible or with a minimum deviation from a previously fixed time delay. The expected deviation should be as low as 4 ms. As I want it to be fast, I canno...

Hi Pidestrian, I just read the post you made a year back and realised that I have almost similar objective in my project too. I am also facing problems while trying to synchronise frames with GPIO triggers. Besides, the frame rate itself is not stable. Even the loop containing only cam.grab() shows ...