FFmpeg MKV to MP4 HD

[bat guano]

>
> is there any way to make Video:
> 1280x720,
> Format settings CABAC = No,
> add the subtitles and then rest of the settings so that the final muxed
> file is up to or not bigger than 4GB?
>
I don't know about any of this, it's mission creep ;-)

What about the original question?

"convert MKV file using ffmpeg via CLI to MP4 (BBC 
HD spec. or not bigger than 4GB)"

Is this solved yet?