How to find duplicated frames?

[Zabar12]

iuVCR sometimes duplicates frames to compensate for dropped ones. This is a great feature but it does not report where frames were duplicated. Is there a way, using avisynth or something, to find duplicated frames in a file encoded by huffyuv in YUY2?

[manono]

I'm not sure if this is what you had in mind or not (if you want a list of the dupe frames handed to you, it won't do that), but after the first pass of the AviSynth filter Multidecimate you'll have a text file where each frame gives a metric showing the difference between it and the previous frame. All the ones with 0.000 (or close to that) are the dupes. It's easy enough to scan through the file to pick out the duplicate frames:

http://neuron2.net/multidecimate/multidecimate.html

There's much more info in the included HTML file.

You might try and figure out why you get any dupe frames at all. With modern computers, when capping with the right set up, I don't think any frames at all should be duped. But mine have been all VHS caps, so maybe it's different if Hi-Def caps from television.

[Zabar12]

Thanks, I think, I needed something like that

[jmac698]

There's two kinds of dropped frames, one kind from the past is when the computer couldn't keep up with saving the information. This isn't a problem anymore, and all those tips about not running extra software, turning on DMA etc. are probably obsolete.

The other type is when the timing of the frames vary from the recording framerate which was set upon recording. It's a problem of how windows works, I think. There's nothing you can do about this. It sh9ould be that each frame causes a request to save a frame, instead you read the frames at a regular rate and they either happen to be a new one at the time or else it's dropped/duped.

[Cauptain]

iuVCR sometimes duplicates frames to compensate for dropped ones. This is a great feature but it does not report where frames were duplicated. Is there a way, using avisynth or something, to find duplicated frames in a file encoded by huffyuv in YUY2?

Try ExactDedup 0.03 its will help you.

Check more about this script here.


Source: http://tasvideos.org


Claudio

[Zabar12]

Try ExactDedup 0.03 its will help you.

Thanks, but I've already mastered Decimate, which seems to be working fine, and permits further analysis of frame data in Excel. Indeed, the only thing I need is to get a list of duped frame numbers to replace them afterwards manually with correct ones.