If you absolutely want to target an average bitrate, you should checkout 2-pass encoding. Increasing it will mean lower bitrate and worse quality, lowering it vice versa. You're free to experiment with the crf value.
you target a certain quality and the encoder decides which average bitrate is the best for your file : ffmpeg -i.
Instead, you should try encoding with "constant rate factor", i.e. Please note however that this will use a 1-pass average bitrate method which is pretty bad for quality. I suggest you re-encode with the H.264 codec which you can do like this : ffmpeg -i. My guess is that ffmpeg tries to use the mpeg4 codec by default, and it refuses to use less than 2mbps because it simply can't go below with such a high resolution. When re-encoding a file, you shouldn't just specify a bitrate.
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