[daala] Fwd: Great encoder idea: Face recognition & Double bitrate

Ralph Giles giles at thaumas.net
Wed Oct 30 19:36:44 PDT 2013

On 2013-10-30 5:19 PM, Alexey Eromenko wrote:

> This idea is simple: The encoder must analyze each frame with a "face
> detector", and if a macroblock contains a face, then give it higher
> bitrate (double? quadruple? bitrate), while other objects (such as the
> carpet or a wall) can be given lower (half?) the bitrate.

There's an open source face detection library in the opencv suite. The
way to try this would be to add a region-of-interest API control, run
the face detector on the input footage and use that to tell the encoder
to vary the quality in those particular regions.


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