On 2023-02-22 10:12 pm, Timo Rothenpieler wrote:
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.
FWIW, that's what LAME does.
libavcodec\libmp3lame.c
119: lame_set_VBR_quality(s->gfp, avctx->global_quality /
(float)FF_QP2LAMBDA);
global_quality semantics seem overloaded. Maybe we should just redirect
user to priv vbr and error out in fdk init.
Regards,
Gyan
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