Does it take a long time to retrieve the video, for example, it may take more than two minutes for me to retrieve the two minute video? Because each time the read() function is entered, only one frame of data is read, and the data per second contains 25 frames.
Is this related to - https://developer.milestonesys.com/s/question/0D53X00006oMpf5SAC/when-i-click-the-retrieve-data-buttonit-shows-failed-why -?
If this is not related please add more context and rephrase the question.