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

[shauli.rozen at gmail.com]

thanks , exactly what I have been missing :)

On 2/13/06, Tuukka Toivonen <tuukkat at ee.oulu.fi> wrote:
>
> On Mon, 13 Feb 2006 shauli.rozen at gmail.com wrote:
>
> >I realize that IDR frames are very important to synchronizing .
> >but , is there any thing different in the way they are coded against
> regular
> >I frame.
> >in a regular I frame , all the blocks are still coded as Intra right?
>
> Yes, but
>
> P frame after an I frame might have motion vectors pointing to frames
> before the I frame, so you can't seek to I frame and continue
> decoding happily as you don't then have the frames before the I frame.
>
> 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.
>
> That's how I understand things...
>
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