How to extract I-frames from video?

2013 7 22
3 个回答
更新时间：2014 5 2
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0 个投票

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.

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Jan
Jan 2013-7-22
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
RONAK 2013-7-23
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..??

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回答（3 个）

Jan
Jan 2013-7-23

0 个投票

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.

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RONAK
RONAK 2013-7-25
My basic aim is to encrypt video. I want i-frames to be encrypted.

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RONAK
RONAK 2013-7-25

0 个投票

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.
Deven P
Deven P 2014-5-2

0 个投票

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.

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RONAK
RONAK
2013-7-22

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Deven P
Deven P
2014-5-2

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