AviSynth Q&A

[Wilbert]

Great work. I'm sure German people will appreciate this!

[Selur]

hail to arlsair

[coaa]

Originally posted by Wilbert
Corrected Q13.3:
How to read import mpeg2-files in AviSynth.

Removed Q36:
That was about the mpeg2enc.dll plugin, that had nothing to do with AviSynth.

Added Q35:
Q35: When i try to use SpatialSoftenMMX, it crashes in VirtualDub ?
A: You probably used this filter before resizing. Apperently SpatialSoftenMMX doesn't like resolutions that cannot be divided by 8 or 16. So if you use it after resizing it works, of course.

Hey guys.. Where exactly is this FAQ posted? I can't find these questions listed anywhere on http://www.avisynth.org/index.php?ac...ge=AviSynthFaq

[Wilbert]

Those are questions from a faq which is a dozen times updated.

How to read import mpeg2-files in AviSynth.

Is listed in Q3.5: MPEG Decoder (source) Plugins: (...). (and also in Q2.8).

SpatialSoftenMMX

Nobody uses this plugin anymore. I thought it was a filter from mpeg2dec.dll, but looking at http://users.win.be/dividee/avisynth.html I guess I'm wrong. Anyone?

[esby]

I don't know if it is mentionned anywhere...

But there is a bug that scarface encountered on a script he copy pasted from the forums..

the script was saved in unicode:
so when you open it with notepad, nothing seems wrong...
but when you try to load it, it will throw an exception.

check http://esby.free.fr/perso/scarface/
for a working and non working script...

esby

[ilovejedd]

I didn't find this in the FAQ so I'm asking here regarding function name precedence. The AviSynth website has the following information:

The order in which function names take precedence is as follows:

1. user-defined function (always have the highest priority)
2. plugin-function (have higher priority than built-in functions - they will override a built-in function)
3. built-in function

Inside those groups the function loaded at last takes precedence, there is no error in a namespace conflict.

What is the order in which AviSynth loads functions? For example, I have the following plugins in the AviSynth plug-ins directory: dgdecode.dll, mpeg2dec.dll, mpeg2dec3.dll and I use the following script:

mpeg2source("test.d2v")

Which mpeg2source() function will AviSynth use?

Also, say I have DGDecode.dll v1.4.8 in the AviSynth plug-ins directory. However, a particular project requires DGDecode.dll v1.1.0 which I have saved in C:\DVD-RB\. If I use the following script:

LoadPlugin("C:\DVD-RB\DGDecode.dll")
mpeg2source("test.d2v")

Will AviSynth use v1.4.7 (auto-loaded) or v1.1.0?

Thanks!

[foxyshadis]

Precedence of autoloading is alphabetical; the last loaded is the one that wins, but you can still use dgdecode_mpeg2source() even if mpeg2dec3 takes the unspecified name over. Giving them new names so they load before dgdecode is wise; but I'd keep them in a manually loaded "obselete" folder anyway, especially since mpeg2dec3 doesn't play nicely with 2.5.7 at all.

In the second question, you're manually loading one, which always takes precedence over an autoloaded function.

[ilovejedd]

Thanks for the very helpful info! I know that AviSynth supports DLLname_function() but since the script is automatically generated, I wanted to know which function will be used. I don't really have mpeg2dec.dll or mpeg2dec3.dll as I'm very happy with DGDecode. I just used them as an example. I kinda thought it might be alphabetical but I just wanted to make sure.

[Ð.Sp!dér]

Why does Avisynth show "fps=23.9759856527702" while GSpot only sees 23.976 ? :|

[foxyshadis]

The internal fps is an arbitrary precision division of two numbers, and usually isn't exact. The gspot one just rounds it off to three places to make it look nice (and possibly fits it to the nearest "normal" ratio). The exact one would be 24000/1001.

[Gilgamesh83]

I recently posted something like this in another thread but if you wanna solve the problem with the fps in avisynth is to in my case with convertfps is to write not convertfps=23.976 which results in a 23.975 encode and playback of that avis but to enter convertfps=23.9762 thats right just a simple 2 after the 23.976 crazy eh! But not really since I came up with the idea of entering 23.9762 after I looked into a statsfile created by x264.exe and saw that it uses the division 250000/10427=23,976215594130622422556823630958

Anyway this solved my problem with my fps in avisynth, oh and this also applies to 119.880 fps which must be entered as 119.881=correct.

[IanB]

Read this thread! ... nicefps() into changefps()/assumefps()

[abood-conan]

Hi everybody,

i Don't write a lot in this forum maybe because I still need the experience ...
anyway, I will not take too long time from you
but I want to ask a question .. encoding an anime ( avi ) .. how can i use avisynth to help me improve the overall look of the video .. i don't want you to explain .. just suggest some plugins that can be useful and i will search about the rest ^^
please help me guys.

[anahita]

Ok, thanks Richard.

[abood-conan]

guys .. i'm trying to encode anime in avi which is DVD originally .. but i don't know how to deinterlace it .. dvd2avi says it's interlaced .. so can you give me any way to deinterlace ..

[Leak]

Originally Posted by abood-conan

guys .. i'm trying to encode anime in avi which is DVD originally .. but i don't know how to deinterlace it .. dvd2avi says it's interlaced .. so can you give me any way to deinterlace ..

If it's anime, it's most definitely telecined which usually means that the original progressive video can be restored.

Don't just deinterlace it, since that'll ruin it. Search for the TIVTC AviSynth filter and give it a try.

[Guest]

From Avisynth documentation:

It turns variable framerate video (vfr) into constant framerate video (cfr) by duplicating or skipping frames. This is useful when you want to open vfr video (for example mkv, rmvb, mp4, asf or wmv with hybrid video) in AviSynth. It is most useful when the fps parameter is set to the least common multiple of the component vfr rates, e.g. 120 or 119.880.

[Guest]

Set it to true.

[Wilbert]

Both false and true will result in cfr. The difference is that setting it to false, it will load the video with fps=25. If the frame rate is different, or variable, you will get video and audio which is not in sync. When setting it to true it will add/delete frames (to match the specified fps), with the result that the video and audio is in sync.

Since asf is vfr, yes, you should use it.

[Wilbert]

Ok thanks! That explains a lot! What exactly is happening if I don't specify any fps parameters? If I just have a script like this:

It tries to guess the fps, but i forgot how that works. Perhaps someone else knows?

Would this result in audio sync errors too?

Yes. Arguments have a default value (which is false for convertfps), which are used if you don't specify the arguments.