[libav-api] Basic question about AVCodecContext::draw_horiz_band()

wl2776 wl2776 at gmail.com
Thu Mar 15 12:36:56 CET 2012

Hi all.
I'm wondering what is this function (draw_horizontal_band) for?
The comments say that this function is called by libavcodec decoder to draw
a horizontal band.

Where does it draw that horizontal band?
In which cases does it do that?

I understand that this is a basic question and feel like I'm missing some
basic knowledge.
Could anyone explain or share a link to the resource which could explain


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