Processing large video files in Azure Function

Question

I am trying to put a watermark in the video files (any size) through an Azure fucntion(C#). For the same, I am downloading the video into a Stream from an external source and then splitting it into frames and applying a watermark in each frame. And then merging it back. For the same, I am using FFMeg & OpenCV.

While splitting the file, I have to get the whole file and then process it frame by frame. For smaller files, it has no issues, for large files (like 2+ GB) it's going to impact the memory.

Any suggestion on the same, to do it in a better way?

With all other steps, I am using the durable function to process the same with 5-6 small Functions.