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Date: Wed, 31 Oct 2012 17:28:00 +1030
From: Shane Ambler <FreeBSD@ShaneWare.Biz>
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To: Jakub Lach <jakub_lach@mailplus.pl>
Subject: Re: I need a simple cli tool to rotate mp4 video.
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On 31/10/2012 09:01, Jakub Lach wrote:

> $ ffmpeg -i A.mp4  -vf "transpose=1" -r 30 -sameq -acodec copy B.mp4
>
> Is _almost_ ideal, apart from x1.5 increase in size... playing with fps does
> not
> change it too.
>

try the -b option to specify the bitrate you want.

while I haven't tried it -fs is meant to specify the target filesize.
I am guessing that it would adjust quality to match that size.