Smart Encoding and lower-quality output

:stupid:Im having issues to perfom smart encoding file-splitting in various 'fan-applications', since the comersial splitters seems to use trued split instead I use AVIdemux and various relatives to Virtualdub for AVI, my problem gets the same on both, the output loose in video quality for some reason, alot worse b/px quality and bitrate, it works thou, but unacceptable :) in VD i use direct stream copy on everything, and just slide-mark the places and save it out In AVIdemux i just input, slide-mark and save as, and say yes to every prompts it suggest (its accually enough to just say yes to smart encoding for it to get worse quality output i have concluded) what am i doing wrong thath makes 2 programs to lower the quality? i have talked to some people and it should not lower it, its harder to get a solution from them thou, so do you have any instead? or do you perhaps have any other programs thath you know splitt smart without lowering Quality thath you can instruct? /Thanks in advance

@Kloppstock Well, there is nothing wrong in that "Test1.avi" on your screenshot has lower bitrate than "Test.avi". Why? Because your original file ("Test.avi") is variable bitrate file, meaning that for some chunks bitrate goes above the average while for others it goes below the average. In this case you simply extracted chunk with lower than average bitrate.

The only non-uncompressed video I know of that is completely CBR is DV.

@ Kloppstock