Is there a way to scan for null or inserted frames in Virtualdub?
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If the capture was made with VirtualDub, Go -> Next drop frame which is Shift+] i.e. the } character. This will jump to frames that were marked as Inserted in the Capture mode. In the status bar with the frame # & timecode they will be marked with [D] instead of [K].
I don't know whether this will detect what Lagarith calls Null frames. And captures made using other software may or may not mark inserted frames the same way.
I don't know why the "dub" mode of VDub uses different terminology than the Capture mode. When you open a capture, there is no way to find the locations of what the Capture mode actually refers to as Dropped. Those frames are completely missing from the output file. -
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I have an AmaRec capture that I labelled in the filename with +15f, and I can indeed count all 15 using Shift+].
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An AVISynth script can easily find exact duplicates. You simply use one of the YDifference functions, and when they return zero, you know you have a duplicate.
This script replaces each duplicate with a new frame that is synthesized from the first frame prior to the duplicate:
Code:function filldrops (clip c) { super=MSuper(c,pel=2) vfe=manalyse(super,truemotion=true,isb=false,delta=1) vbe=manalyse(super,truemotion=true,isb=true,delta=1) filldrops = mflowinter(c,super,vbe,vfe,time=50) fixed = ConditionalFilter(c, filldrops, c, "YDifferenceFromPrevious()", "lessthan", "1.1") return fixed }
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