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halsboss · 1st February 2009, 06:40

Worked it out. Hopefully correctly. Finally, something gives a consistent result, right or wrong FFMpegSource V2.00beta4 from http://forum.doom9.org/showthread.php?t=127037 is consistent and usable on the odd source exihibiting the aforementioned problem in post #1.

Code:

loadplugin("C:\Program Files\AviSynth 2.5\plugins-zzz\FFMS2.dll")
FFIndex("G:\DVD\problem\problem-full.avi", indexmask=7, dumpmask=0, overwrite=true)
FFVideoSource("G:\DVD\problem\problem-full.avi")
AssumeFPS(25)

The FFIndex(..., overwrite=true) forces re-creation of a full index with the same filename/extension plus appended extension ".ffindex". In this case a 500Mb xvid .avi results in only about an 8Mb ".ffindex" file. The FFVideoSource(...) seems to detect the ".ffindex" and use it. It takes about a minute for the FFIndex(...) to do it's thing which is acceptable in the scheme of things to get a reliable source for avisynth to use.

The original problem, of out-of-sequence frames being returned, goes away and you get a repeatable result whether stepping forward or backward through the frames in the non-bitstream-packed xvid .AVI.

I guess a thing to be aware of is a 2-pass HCEnc may force re-creation of a new index. If you use HCEnc, I guess the "lossless" function is handy - it's better than great for slow scripts in any case !

A HUGE thankyou to poisondeathray and jagabo without whose direction a usable solution would never have arisen.

1st February 2009, 06:40	#3 \| Link
halsboss likes to tinker Join Date: Jan 2004 Location: girt by sea Posts: 635	Worked it out. Hopefully correctly. Finally, something gives a consistent result, right or wrong FFMpegSource V2.00beta4 from http://forum.doom9.org/showthread.php?t=127037 is consistent and usable on the odd source exihibiting the aforementioned problem in post #1. Code: loadplugin("C:\Program Files\AviSynth 2.5\plugins-zzz\FFMS2.dll") FFIndex("G:\DVD\problem\problem-full.avi", indexmask=7, dumpmask=0, overwrite=true) FFVideoSource("G:\DVD\problem\problem-full.avi") AssumeFPS(25) The FFIndex(..., overwrite=true) forces re-creation of a full index with the same filename/extension plus appended extension ".ffindex". In this case a 500Mb xvid .avi results in only about an 8Mb ".ffindex" file. The FFVideoSource(...) seems to detect the ".ffindex" and use it. It takes about a minute for the FFIndex(...) to do it's thing which is acceptable in the scheme of things to get a reliable source for avisynth to use. The original problem, of out-of-sequence frames being returned, goes away and you get a repeatable result whether stepping forward or backward through the frames in the non-bitstream-packed xvid .AVI. I guess a thing to be aware of is a 2-pass HCEnc may force re-creation of a new index. If you use HCEnc, I guess the "lossless" function is handy - it's better than great for slow scripts in any case ! A HUGE thankyou to poisondeathray and jagabo without whose direction a usable solution would never have arisen. Last edited by halsboss; 1st February 2009 at 07:30.