In order for a video frame to be decoded you need an Intra frame (key frame), for the next frame predictive or bi-directional to be decoded you still need to refer back to the original Intra frame in the sequence. However it's not a good format for editing due to the large GOP sequence / keyframes and in some cases video footage with only one starting keyframe. mp4 to avi or avi to mp4 it can sometimes mess up the saved work especially DivX / Xvid content.Įverything is h.264 these days on the internet because it's one of the best video compression codecs when compare to the likes of mpeg-2 or Sorenson Spark. There is a very nasty bug in Avidemux (Windows only?) it has a tendency to drop the end frame of a chopped clip a work around would be to cut but the end position is one frame ahead of where you think it should be.ĭon't change the video container when you save your work, i.e. (-crf is frame quality encoding 22 is high, 25 still good after that video gets blocky from 30 onwards) 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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