[FFmpeg-devel] [ffmpeg-devel] [PATCH] nvenc: add initial QP value options for nvenc

[Philip Langdale]

On Tue, 28 Feb 2017 05:44:04 +0000
Konda Raju <KRAJU at nvidia.com> wrote:

> Hi,
> 
> The attached patch adds initial qp value options for I, P and B
> frames.
> 
> -Raju Konda
> 
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Makes sense.

On a related note, have you considered how the constant qp mode should
work? I found this discussion:

http://forums.guru3d.com/showpost.php?p=5369519&postcount=10

which noted that x264 sets the I and B frame quantizers to ratios of
the P quantizer in crf mode (equivalent to const qp), while nvenc sets
all three to the same value. Should nvenc set different values too?

Thanks,

--phil