Detect scene changes in Avisynth?

[AlanHK]

I've got an AVI several generations removed from the original old TV capture.

One problem is that many scene transitions are scrambled and a bit jarring when viewed.
Eg, this sequence, frames 3314, 3315, 3316.

I'd like to replace the transition frame with the previous or next one:

FreezeFrame(3315,3315,3314)

This gives a more pleasant viewing experience.

The problem is of course finding all the transition scenes.
If I could get a list of all scene changes by frame number I could quickly review and fix each one if necessary.
Since a lot of encoding software needs to know where scene changes are, it seems to me this problem must have been solved. Is there a way to do it in Avisynth (or VDub)?

[foxyshadis]

Virtualdub does have that next scene/last scene button, the green one. Set the sensitivity in preferences and give it a try.

[AlanHK]

Virtualdub does have that next scene/last scene button, the green one. Set the sensitivity in preferences and give it a try.

Thanks, that seems promising. I can get most of the affected frames if I put the sensitivity at 240.

I don't use VDub a lot, except to run AVS files. Is there a simple way to make bookmarks and/or collect the frame numbers?

I suppose I'll ^G ^C ^V a lot otherwise.

[mitsubishi]

I was looking into this yesterday, more for a programmatic approach, but there is an avisynth filter: http://avisynth.org/warpenterprises/ (look for SceneChangeLavc), which can create a list.

There was an idea also by berrinam: http://forum.doom9.org/showthread.php?p=788250#post788250

[Ebobtron]

You could try HC's gui which has a create scene list feature.

Load your avs script on the first page then click the tab "Preview/Chapters", click the create SCD chapter list, when done use export chapter list to file.

I find it very accurate, but opinions differ.:)
ta

[[P]ako]

This is one thing at which YATTA is good for. Create an avs load it in YMC.exe, uncheck everything but Slavc, run it, it will create a .yap file containing a list of all the frames at which a new scene starts. Then load the .yap in YATTA and jump from scene to scene, use the tool button to freezeframe unwanted frames. Then save an avs.

[AlanHK]

Thanks all.
Slavc run via Yatta does the job.

[Harukalover]

SCXvid tends to be more accurate than SClavc. Yatta is compatible with SCXvid in YMC as well.