Video splitting without having to split from the keyframe?

[andy_blah]

Sorry if I posted in an inappropriate forum, but this is the one that I thought that this one fits this thread.

I have a problem where I require a lot of video splitting and with the software I tried it cannot split only from or to the near keyframe. The software I tried was Avi splitter and Easy Video Splitter. Yes, the format of the video is .avi

Can somebody suggest me what program to use (that does not requite recompressing after splitting) ?

[poisondeathray]

If your .avi is DivX/XviD, you can't do frame accurate cutting because of the way it is compressed.

The best you can do is smart rendering (which only re-encodes the few frames around the cutmark if not on a keyframe, but the rest of the video is untouched)

You can enable smart rendering mode in the latest few versions of vdub, or avidemux has it on by default

[andy_blah]

But will this SmartCopy be more accurate? If so then I think I will use Avidemux.

[poisondeathray]

Yes, because you can navigate and cut frame by frame with the arrow keys, instead of jumping by keyframes.

[andy_blah]

Well at selection those two programs that I mentioned earlier were accurate, just that when they "extracted" that selection it was not as accurate. I hope that in your post you are talking about the extraction part.

[poisondeathray]

It's as accurate as where you put the mark in/mark out markers, and you can navigate by individual frames. You can't get anymore accurate.

This is a glass half empty/glass half full thing. You can either delete the sections you don't want, or select the section you do want and direct stream copy.

But you will have problems if it's the abomination h.264 in .avi, only works for DivX/XviD

[andy_blah]

And what does that "abomination" mean to you? The .avi files are Xvid, and it has H.263 as quantization. Did you mean that instead of H.264?

[poisondeathray]

It should work for you no problems since you have XviD. If you want to select a portion of a clip to copy in avidemux, use the mark in / mark out, select "copy" for the video & audio sidebar, and format set to "avi". Press save with extension (e.g. "myfile.avi"). It will ask if you want to enable smart rendering, say yes, and then select the quantizer (the lower the quantizer, the higher the quality) - it will only re-encode around the cut site since you are not on a keyframe, the rest of the video will be untouched.

h.264 (AVC or MPEG-4 part 10) isn't completely compatible in .avi container, but you still see people trying to force it into that container. I was just joking a bit there...hence "abomination"

Cheers

[andy_blah]

Can you tell me precisely where can I select that Smart Rendering in Virtual Dub? Avidemux seems to crash quite often. I`ve tried in VirtualDub to enable Smart Rendering but it does not work only if I select Full Processing mode, and that means that I have to recompress the video, and that`s not really what I wanted

[poisondeathray]

In vdub video=>smart rendering. I don't use vdub for stuff like this, I use avidemux so maybe someone can give you better instructions. Can't you checkmark smart rendering and have direct stream copy?

I can't recall avidemux ever crashing on a simple XviD/MP3/AVI video. Unless you have some weird audio (not mp3). Are you using the latest build? http://avidemux.razorbyte.com.au/ Did you follow the instructions above?

The other possibility is that your file is corrupted and that's what's causing your problems

[andy_blah]

As I said, I cannot have Smart Rendering AND on Direct Stream Copy mode, if I check SmartRendering and after that I choose Direct Stream Copy it splits from the keyframe.

AviDemux does not crash when I open the file, it crashes even if I just seek through the video. Yes I`ve got 2.4.3. I donnot know what instructions you are referring to. The file is not corrupt, I can assure that, opened it with GSpot.

[poisondeathray]

For vdub, did you use smart rendering and fast recompress? I think that's the way you're supposed to do it - like I said I use avidemux for this stuff usually, so I'm not too sure. There is more info here https://forum.videohelp.com/topic325116.html

I just tested it on several clips with avidemux - all work. I'm using 2.4.3 r4297 GTK+ version. Once again these were XviD/MP3/AVI. It's not a configuration issue, because avidemux is self contained and has all codecs internally.

FYI, just because the file opens in Gspot does not mean the file is not corrupt...

Sorry I have no more ideas for you

Cheers

[sambat]

In VirtualDub, selecting Video => Smart Rendering => Compression, and select the same compressor as the source, ensures that only the area around the cut is recompressed.

[andy_blah]

I will try that soon. Thank-you