[FFmpeg-devel] [PATCH] nvenc: Propagate desired number of reference frames.

Philip Langdale philipl at overt.org
Fri Jan 23 18:28:40 CET 2015

On 2015-01-23 01:54, Timo Rothenpieler wrote:
>> +    ctx->encode_config.encodeCodecConfig.h264Config.maxNumRefFrames = 
>> avctx->refs;
> avctx->refs should propably be checked for >= 0.
> I'm not sure if maxNumRefFrames means the exact same thing as
> avctx->refs, but the comment in the nvenc header isn't exactly clear
> about that.

nvidia's encoder implementation does this mapping.

> This would also forward the ffmpeg default, 1, to nvenc, instead of
> the nvenc default, 0, which lets the driver decide what is best. I'm
> not sure if this is desireable and how much it affects the quality.

Depends on what your consistency goal is. As long as 0 can be forwarded,
then you can always set it to 0 explicitly to request auto - and you can
argue that ffmpeg consistency (default ref frames of 1 is respected by 
encoders) is desirable.


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