I tried a 080414 f265 release with bref=1 bframes=3 and I did not get a
reference B in the mini-GOP.

Hi,

perhaps you didn't add enough reference frames. You need at least 3 refs to have a reference B frame. Try with 'ref=3 bframes=3 bref=1'.

Note that adding more than 1 B frame typically degrades quality at the moment, even with B pyramid. We need the lookahead to determine a good B frame layout. This is being implemented.

Regards,
Laurent
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