[x264-devel] Re: the difference between IDR and I frames

[shauli.rozen at gmail.com]

but , do I know that none of the following frames will use a frame prior to
this I
frame as a reference?

Also . I see that there is a clipping of the min_key_int , so that it won't
be larger
then (max_key_int/2+1) , is that something from the standard ? I looked for
it
but did not see it , can't I use a strict GOP size like -  min_key_int ==
max_key_int == 30 ?

that is , if a scene cut is detected in the middle of the GOP use always I
and not IDR
frame.

A bit of explanations about how a scene cut is detected will also help me a
lot.

thanks !


On 2/13/06, Mathieu Monnier <manao at melix.net> wrote:
>
> > IDR frame "breaks" the stream, ensuring that later frames don't
> > point to frames before the IDR frame. So, you need IDR frames
> > to seek to.
>
> Not quite. IDR prevents also open gop ( because it flushes the DPB
> removing the reference for the previous B frame ), while open gop
> doesn't prevent seeking. That's why you can insert SEI messages telling
> that a I not IDR can be used as recovery point.
>
> Regards,
>
> Mathieu
>
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