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I frames from a video file

Asked by avi king

avi king (view profile)

on 28 Jun 2011

Hello every one, I am trying to find all the i-frames from any video file. Are there any possibilities of finding it on Matlab or outside of matlab. Please suggest me.

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avi king

avi king (view profile)

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2 Answers

Answer by Walter Roberson

Walter Roberson (view profile)

on 28 Jun 2011
Accepted answer

In order to do it in MATLAB you would have to open the video file as a binary file, and decode the binary file format.

In MATLAB, once you have read in a video file using aviread() or VideoReader or the like, the information about which frames were I frames is not retrievable from the decoded stream. There is no fixed rule for which frames must be I frames (other than the first and last frame): any other kinds of frames are only optimizations to reduce bandwidth requirements.

You might be able to find C or C++ source code for reading these kinds of files, and you could then adapt that source to tell you which frames were of which variety. I do not recall having seen any MATLAB source code for reading these kinds of files, but it is not something I have looked for.

If you have a moment, I would appreciate a brief explanation of why you want the I frames? We have had this question before (about extracting the I frames), but people have not explained what they intend to do with the information; about the only answer we've had has been the impression that "I dunno: it is a course assignment."

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Walter Roberson

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Answer by avi king

avi king (view profile)

on 28 Jun 2011

I am working on steganography. If i can get I-frames from a video file, I can atleast have some progress in my work

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avi king

avi king (view profile)

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