[x264-devel] region of interest coding on a per macroblock basis... can it be done?

[Loren Merritt]

On Wed, 13 Nov 2013, Yang Guo wrote:

> Hi x264 folks,
>
> I am looking to encode a frame with "region of interest (ROI)" coding.  The
> idea is that I have a frame in which I know that certain regions (for
> example, the center) are more likely to be the subject of interest relative
> to other regions (ex: the sides).  Therefore, the ROI should receive
> greater number of bits.
>
> My thought was to use different quantization stepsize (QP) per macroblock.
> Moreover, I would like to specify a different ROI for each frame.  How can
> this be achieved with x264?
>
> Thanks for your help in advance!

x264_image_properties_t.quant_offsets

--Loren Merritt