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Recently I encountered games whose videos consist of short period length(10s - ~1min), but with incredibly big size for such length(80-200mb). These and few other cases, like videos with quick movements/transitions may need higher bitrate as 320k can be on the edge(even for 360p resolution). 640k-768k can be considered. I found that for these special cases even higher bitrate doesn't create files bigger than ~10% of original. For example, recently I recoded 4.2gb vids to ~320mb with 768k. This was for mp4(h264) not bink, maybe thats why, but 320k work on them in majority of cases as well.
What I am saying is that sometimes, certain input content behave "specially" to encoders in terms of output and ratio. In those cases, 320k would create files way too small(say under 1mb of like ~60mb+ original). Based on that too high ratio you would know something is not right, where you normally get ~4-8x less size using 320k now you see ~50x+ less, which is suspicious. In those cases, dont worry increasing(up to 640-768k should be enough) bitrate as you are still going to get *extremely good* ratio. This also mean that ratio comparison between original and recoded size with visual quick preview is an important practice to find and treat those "special cases".
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