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Intra Frame Distance

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Max Tremblay
Intra Frame Distance
on Mar 12, 2014 at 2:11:55 pm

I am curious to know what Intra Frame Distance (specifically 12) means and where I could find this information in a video file.


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Mark Suszko
Re: Intra Frame Distance
on Mar 12, 2014 at 3:27:40 pm

I believe that's how many frames in between "I" frames (versus "b" frames" in a video compression scheme .


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Max Tremblay
Re: Intra Frame Distance
on Mar 12, 2014 at 8:07:40 pm

Okay thanks. How would I go about finding this information?


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Ryan Holmes
Re: Intra Frame Distance
on Mar 12, 2014 at 4:15:33 pm

I-frame distance is a type of compression scheme, as Mark notes, consisting of I, P, and B frames.
I = Intra coded frame
P = Predicted picture
B = Bi-predictive or Bi-directional picture

These options are set upon compression by adjusting the "Keyframe Distance" in your encoder of choice (Compressor, Media Encoder, Sorenson, Telestream, etc.). For a read through take look at Wikipedia:

http://en.wikipedia.org/wiki/Video_compression_picture_types

Ryan Holmes
http://www.ryanholmes.me
@CutColorPost


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Max Tremblay
Re: Intra Frame Distance
on Mar 12, 2014 at 8:08:58 pm

I see. I received a video and need to figure out the distance between these frames, so how would I go about finding this information?


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Ryan Holmes
Re: Intra Frame Distance
on Mar 12, 2014 at 11:13:20 pm

[Max Tremblay] "so how would I go about finding this information?"

Out of curiosity, why would need this information?

Typically people set it to half the frame rate. So if it's a 30fps, typically people set the keyframe at 15; if it's 24 people set the keyframe at 12. At least that's standard practice for how I typically encode...unless you have really fast motion sequences then I may shorten the distance between I-frames.

Ryan Holmes
http://www.ryanholmes.me
@CutColorPost


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