[FFmpeg-user] b and bt

[Tom Evans]

On Mon, Nov 26, 2012 at 11:07 AM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
> 2 pass only makes sense if you need a specific bitrate.
>

I don't really understand this. I thought with multi pass encoding,
the encoder can 'save up' bandwidth from scenes that do not change to
use in high action scenes. Surely this results in multi pass encoding
giving an output that is of identical or better quality, but lower
bitrate, since the encoder on the n-pass can be more efficient.

Can anyone hit me with a clue bat please?

Cheers

Tom