Editing Compressed Files?

[Volderbeek]

Is there a way to edit compressed video files (divx, mpeg, etc) and preserve the most of the original quality?

[anonymez]

unless by editing you mean splitting, which can be done losslessly, technically there is always quality loss when encoding to a lossy format. whether it's noticeable or not depends on the codec, bitrate & settings

[Volderbeek]

Yeah, I have a program for splitting but I mean actual changes to the orginal video frames...