Hi Konstantinos, Well, the IDL help for READ_VIDEO's HANDLE keyword says: "When reading from a file multiple times (for example, frames 0 - 74 read via a loop structure), by default IDL opens, reads, and closes the file one for each frame. When using a handle, IDL opens the video, reads each of the 75 frames, then closes the file." So, I think this is what you will need to use when reading all those frames that you have. It will be much more efficient than opening reading and closing each frame. For example, take a look at the following examples: http://www.exelisvis.com/Company/Pres... and http://www.exelisvis.com/Company/Pres... I hope they will help you. Cheers, Fernando