how can I add a line in a video and play it with implay command?

I want to play a video in which I want a line at a location in the full video, How can I do that. I want to use 'implay' because other methods take a long time and they don't have that many playing options.

[Geoff Hayes]

Mohit - why don't you just read all frames of the video into an mxnx3xk array (assuming true colour frames), insert the line into each frame, and then pass this to implay?

[MOHIT]

Thanks for the suggestion but, I have more than one hour video, storage of that much memory is a problem (It shows an error). If I do this frame by frame using 'for' loop then it will take more time.

Answer 1

[Walter Roberson]

VideoFileReader, modify the frame, VideoFileWriter to write the frame. Afterwards you are left with a movie file you can play with implay