[FFmpeg-devel] [PATCH] libavcodec/libfdk-aacenc: Scale VBR mode with FF_QP2LAMBDA

Timo Rothenpieler timo at rothenpieler.org
Wed Feb 22 18:42:39 EET 2023

On 22.02.2023 17:33, Gyan Doshi wrote:
> From
> fftools\ffmpeg_mux_init.c
> 619:        ost->enc_ctx->global_quality = FF_QP2LAMBDA * qscale
> Regards,
> Gyan

But that's only if you set the old qscale CLI options.
If you set the global_quality option directly, there is no factor applied.

By dividing by FF_QP2LAMBDA you break setting this value via 
global_quality, and instead add support for setting it via the old and 
pretty much abandoned qscale interface.
Which is an API break.

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