[SOLVED] [slicing] Recreate full frame to avoid re-encoding?

[yetanotherlogin]

Hello

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?

Thank you.

[ndjamena]

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.

https://www.videohelp.com/tools/sections/video-editors-h264-avc

MKVCutter is free
SolveigMM Video Splitter isn't
There are probably others there.

[yetanotherlogin]

Thanks for the infos.

So I'll just re-encode with AviDemux.

[ndjamena]

???

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.

[yetanotherlogin]

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?

http://www.dvdvideosoft.com/guides/free-video-editor.htm

[Baldrick]

Because free video editor doesn't support "smart rendering" like mkvcutter and solveigmm video splitter.

[yetanotherlogin]

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

[ndjamena]

I think free-video-editor is one of the programs that cuts on key-frames, at least I can't see anything that indicates it re-encodes the gops on the boundaries.

VideoReDo
Smart Cutter Ps/Ts
MKVCutter
SolveigMM Video Splitter
TMPGEnc

Are the one's that seem to "cut on any frame"

[yetanotherlogin]

Thanks for the infos.

[yetanotherlogin]

"P2P and multicasting"
http://en.wikipedia.org/wiki/List_of_streaming_media_systems#P2P_and_multicasting