how to extract I (Intra) P (predictive) & B (Bidirect) Frames from video?

[tnwmn]

Hi there.. I am interested in extraction I B P frames from one video file (in MPEG4 format).Is there any software or any code or any way exist for that? if there exist something then please guide me....
it will be a great help to me...

thnx

[Gavino]

It's not clear to me what you actually want, but this recent thread might help:
https://forum.videohelp.com/threads/342572-decoding-mpeg-video-into-frames-say-I-P-B-frames

[tnwmn]

Thank you so much for your reply.. Extraction of I B P frames means i am interested to have complete binary (or Hex) code equivalent to video file...i want to study each frame of video. so i want them separately.like if there are 12 frames in one GoP then i am interested in all 12 frames of all GoPs of my video file...

[filmboss80]

Thank you so much for your reply.. Extraction of I B P frames means i am interested to have complete binary (or Hex) code equivalent to video file...i want to study each frame of video. so i want them separately.like if there are 12 frames in one GoP then i am interested in all 12 frames of all GoPs of my video file...

This is not easy to explain, but I'll try. With GOP structures, you can visually play back a representation of individual frames, but in actuality, the P and B frames are not complete, individual, stand-alone frames.

Only the I-frame is a fixed image, with all its pixels completely independent of other picture frames. P-frames produce the pixel macroblocks that are different from those in the preceding I- or P-frame. B-frames produce macroblocks that are different from those in the preceding and following I- or P-frame within a GOP.

For example, lets say there are several seconds of unchanged blue sky in a video sequence. With GOP, there is no need to reproduce blue macroblocks over and over with each frame. And so, the same blue image clusters from an I-frame may linger for a dozen P and B frames, until there is a change. (And sometimes these image clusters are simply shifted when images are panned or zoomed.)

You may need to consider converting your video to a format that devotes each frame of a GOP to fully complete frames, like DV-AVI.

(I confess I'm not sure what you are actually trying to accomplish.)

[tnwmn]

Thanks for explaining such a great concept....will you tell me something more about DV-AVI... actually i am new in this field i dont know much abt all these fundamentals. my requirement is to get I B P frames from a video file....