> +2023-06-21 - xxxxxxxxxx - lavc 60.23.100 - libx264.c
> +  Add mb_info option.

> Do we actually need the option? If the encoder's caller bothered with adding 
> the side data, then I'd think it should always be used, otherwise why is it 
> even there?

 >I agree, I just thought I had to update that file as well, if that's not the 
 >case feel free to remove it.
>Best
>Elias

On a second thought, though, I think I misinterpreted your mail and I  wrongly 
thought you were referring only to the APIchanges file. 

The thing is that libx264 expects a boolean value (b_mb_info) to be set to 
check the mb_info. 
So, yes, in principle I'd agree with you but I think we still need to tell it 
in advance by setting the option because the encoder needs to track additional 
statistics.

>From x264.h:
        int          b_mb_info;            /* Use input mb_info data in 
x264_picture_t */
and then subsequent uses both in frame.h and analyse.c check for the flag to be 
set.

Further on, this flag doesn't seem to be updated by the 
x264_encoder_reconfig(..) method, so the only possibility I see is setting it 
in advance in the setup phase.
Best
Elias



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