[FFmpeg-user] Optimise XDCAMHD422 Picture Quality - Syntax questions

Frédéric Busnel-Joncour fred.bj at free.fr
Tue Oct 23 11:43:16 EEST 2018

> […]
> With qmin4 there are still tiny blocks (looks better than qmin=1), and I
> now from other transcoders that the frames were these tiny blocks happen
> CAN BE better encoded so that no blocks are visible for the whole GOP.
> My questions are:
> 1.) Why do I get a better quality with qmin=4 instead of qmin=1? -> Maybe
> is datarate saved with qmin=4 which can be used for other frames were it is
> needed more?
> 2.) How can I improve the encoding a little bit more here in ffmpeg
> regarding the picture quality?

Hi there,

These are very interesting questions !
I can't explain the first point, but probably 2-pass encoding can improve encoding the way you want.
If an expert can confirm and give a command line example, that would be perfect.



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