WinFF (ffmpeg frontend) can do this for you using the following preset: -crf 22.0 -acodec copy -vcodec libx264 -flags +loop+mv4 -cmp 256 -me_range 16 -g 1 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -qmin 10 -qmax 51 -qdiff 4 Given that h.264 is highly compressed data it's unlikely you'll have enough "I" frames to crop around so basically all your footage would require re-encoding with a key frames or GOP of 1 (or something smaller like -g 5). The built the video encoder is rubbish it's been a while since I used Avidemux but I had problems trying to use the h.264 and h.263 encoder either the resolution was restricted or saved video had errors. If you insert a video clip it must start with an Intra frame "I", predictive or bi-directional are not allowed when saving with "copy" mode the only other option is to re-encode your footage. You can only merge 2 clips providing they have the same codec, frame rate and resolution. Avidemux is the best tool for the job but it does suffer from a few annoying bugs and limitations.
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