Change the RecordVideoFile after the pipeline has started

mdaniel

I have a Oak-1 Lite running with depthai-v3 and need to continuously stream a ImageManip video to screen and to save 1 minute raw video to file every 10 minutes. In order to do this I have a dai.node.ImageManip and a dai.node.RecordVideo in the pipeline to cover both streams.

Each video will need a new filename, but whenever I try to use the setRecordVideoFile it keeps writing to the first set filename. What is the sequence so that I can update the filename of the recording stream?

OskarSonc

Hey @mdaniel - RecordVideo unfortunately can’t roll files mid-run – it reads setRecordVideoFile(...) only once when the node starts, so later calls still write to the first file.

If you want to keep using RecordVideo, you’d need to stop the pipeline, build/start a new one with a new filename for each 1-minute clip. For rolling clips while keeping a continuous preview, it’s better to stream ImageManip → VideoEncoder → XLinkOut and do the file rotation on the host (open a new file every 10 minutes, write 1 minute, close).

Thanks,
Oskar

mdaniel

Okay, thanks for the info. Given I don't really want to interrupt the video stream I've just set it to record frames with OpenCV on the host. It just means an extra few lines after the pipeline set-up to handle multiple cameras, but at least is a functional workaround :-)

OskarSonc

Great to hear!