![]() ![]() ![]() So, if you were to trim and join two clips in that way, it will re-encode four GOP's around the splice point. If frames are trimmed from the end of a clip it will only re-encode the affected GOP. Specifically, if you cut frames from the beginning of a clip it will always re-encode the GOP that the cut falls in and the following two GOP's. If cuts are made at 'frame level' there is, necessarily, re-encoding of some GOP's around the cuts/re-splice points, because of the 'Open GOP' structure. ![]() on the key frames) there is no re-encoding. If the cuts are made at 'GOP level' (i.e. I use Pegasys (TMPGenc) SmartRenderer 5 for cutting down native HD-AVC.mp4 footage from camcorders/cameras: It can be cut at any frame without problems. This video format has its drawbacks, but it is very editing fiendly. The old Mini-DV video cameras use the DV video format which only has I-Frames. If your video is MPEG2 then Cuttermaran is a capable and free tool for this task.Ī special case is video which only consists of I-Frames. For frame accurate cutting only the relevant GOPs will be completely reencoded. Then there is a technique called "Smart Rendering" which you can find in many NLE software. (StaxRip or any video encoding application which uses AviSynth can do this). This makes it easy to cut the video with frame accuracy. AviSynth decodes the whole movie frame by frame, then applies filtering and finally serves it frame by frame to the encoder. If you need to reencode the whole video anyways then AviSynth is the way to go. This means that encoded video can only be cut at I-Frame borders if you do not want to reencode at least partly. ![]() To decode them you will need to decode the whole GOP. Only I-frames can be decoded all for themselves, all other frames have references to neighboring frames. I guess you know the concept of "intra" frames and "non-intra" frames in video encoding. ![]()
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