This is indeed a newbie question.
I often need to slice a video and usually use AviDemux for that. Videos are usually compressed in h264 + AAC and packed into an MP4 container.
Problem is, it's pretty common to have to start splitting on an "intermediate" frame, ie. not a keyframe… which requires re-encoding the video, causing yet more loss in quality.
So I was wondering: Is there a slicer (for Windows) that can generate a new keyframe by taking the intermediate frame and the last keyframe, so that no re-encoding is necessary?
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Last edited by yetanotherlogin; 12th Nov 2014 at 08:03.
Even keyframes aren't losslessly encoded, so the re-encoded keyframe would be of a lower quality than the original, since any frame that references it would expect it to look exactly like the original frame there may be artefacts if you don't re-encode them as well. Also a frame may reference a frame BEFORE the new IDR frame and it would have to be re-encoded in that case as well. It's better to just re-encode the entire gop and there are programs that do that.
MKVCutter is free
SolveigMM Video Splitter isn't
There are probably others there.
A GOP is just the frames between one key-frame and the next, it'd take about 2 seconds to re-encode one using even the most crippling x264 settings. But fine, you do that.
I don't know what a GOP is.
Since FVE pretends to be able to let "you delete unwanted parts from video files without re-encoding", I gave it a try but didn't find how to make multiple selections in a video and have them split into multiple files or (ideally) a single file: Even after making selections, checking "Split by selections" and hitting "Save video", the files don't start where I made the selections. Any idea why?
Last edited by yetanotherlogin; 12th Nov 2014 at 06:18.
I don't know what "smart rendering" is either.
At this point, here's what my screen looks like, and the four files it created do not match at all the start/end selections I made
Thanks for the infos.