How to extract I-frames from video?

Actually, I want to encrypt a video. So, i need to extract the I-frames and then encrypt them. I am new to matlab. So , plz give me detailed explanation.

[Jan]

This question is to general to be answered efficiently. Even if you are a beginner, it is not the nature of the forum, that others solve your problems. So please post what you have done so far and ask specific questions.

[RONAK]

Actually problem is that, every method I used is giving me jpeg images after video to frame conversion. Working just as video to JPEG converter. And I need to encrypt I frames among I P B frames of any video. function frame2im() etc are not providing the output in the form of I P and B frames. So, I am asking is there any way to solve this problem..??

Answer 1

[Jan]

The intermediate frames are reconstructed by using the hierarchy of I, B and P frames. As soon as you want to extract a frame as full image, the information about the frame type is lost. This is the nature of obtaining single frames from the encoded movie stream.

I think it is more efficient, when you find out and explain, what you exactly want to achieve. Specific questions are more likely answered in a forum.

[RONAK]

My basic aim is to encrypt video. I want i-frames to be encrypted.

Answer 2

[RONAK]

where i can have i-frames of the video in the bits or decimal format(image matrix) so that i can encrypt that image matrix and reconstruct the video. plz provide me any link helpful to me.

Answer 3

[Deven P]

yes even i need to extract I-frames from the video to perform chaotic encryption on the I-frame and thus the real-time digital video.

any method to extract I,P,B frames from the video anyone knows of? how can we come to know after extracting the frame that the frame is an I-frame or P frame or B frame?

thanks in advance.