AviSynth (AVI SYNTHesizer) is a frameserver. An excellent description is given on Lukes homepage:
"AviSynth is a very useful utility created by Ben Rudiak-Gould. It provides many options for joining and filtering videos. What makes AviSynth unique is the fact that it is not a stand-alone program that produces output files. Instead, AviSynth acts as the "middle man" between your videos and video applications.
Basically, AviSynth works like this: First, you create a simple text document with special commands, called a script. These commands make references to one or more videos and the filters you wish to run on them. Then, you run a video application, such as Virtualdub, and open the script file. This is when AviSynth takes action. It opens the videos you referenced in the script, runs the specified filters, and feeds the output to video application. The application, however, is not aware that AviSynth is working in the background. Instead, the application thinks that it is directly opening a filtered AVI file that resides on your hard drive.
There are five main reasons why you would want to use AviSynth:
Originally AviSynth (up to v1.0b) was developed by Ben Rudiak-Gould. See mirror of his homepage. Currently it is developed by Sh0dan, IanB, d'Oursse (AviSynth v3), Bidoche (AviSynth v3) and others.
The most recent stable version is v2.57, which can be found here (just as more recent builds).
Current bugs can be found in the documentation on the AviSynth project page. Fixed bugs can be found in the Changelist.
Documentation about the filters of AviSynth can be found on this site Main Page, and in particular here: Internal filters. You should read these documents before posting to the forum, but it's OK to post if you have trouble understanding them.
Starting from v2.06 AviSynth comes with an auto installer. Also make sure you have no other versions of AviSynth floating around on your harddisk, because there is a chance that one of those versions will be registered. Remove them if necessary. For uninstalling AviSynth go to "program", "AviSynth 2.5" and select "Uninstall AviSynth".
Installing AviSynth v2.05 or older versions: move avisynth.dll to your system/system32 directory and run install.reg. For uninstalling run uninstall.reg and delete avisynth.dll.
The versions v1.0x and v2.0x are compatible and outdated. The main difference with v2.5x is that the internal structure of AviSynth has changed (YV12 and multichannel support) with the consequence that external plugins compiled for v1.0x/v2.0x will not work for v2.5x/v2.6x and vice versa. In v2.6x other planar formats like YV24 and Y8 are added. v2.5x plugins will work in v2.6x but not vice-versa. All versions are incompatible with v3.x, which will also work under Linux/MacOSX (see AviSynth v3) and rely on the GStreamer API.
Open a text-editor, for example notepad. Add the following line
Version()
and save the file with the extension "avs". Save for example as "version.avs" (make sure that the extension is "avs" and not "txt"). Open the file in an application which can read AVI-files, for example WMP 6.4 or Media Player Classic. The version number will be displayed.
Use your preferred text editor (e.g. Notepad). See also this.
Although AviSynth doesn't need them, there are several GUIs (graphical user interface) which may help you writing your AVS files. You can read a description for each one of them here.
Anywhere on your hard-disk.
As explained here that is not the case. However it is possible to use a v1.0x/v2.0x plugin in v2.5x/v2.6x, as explained here.
In plugin collection warpsharp_2003_1103.cab you will find a plugin called "LoadPluginEx.dll". (When using an older version of LoadPluginEx.dll, don't move this plugin to your plugin dir. But move it to a separate folder, otherwise VirtualdubMod and WMP6.4 will crash on exit.) This will enable you using v2.0x plugins in v2.5x. An example script (using the v2.0x plugin Dust by Steady):
LoadPlugin("C:\Program Files\avisynth2_temp\plugins\LoadPluginEx.dll")
LoadPlugin("C:\Program Files\avisynth2_temp\plugins\dustv5.dll")
AviSource("D:\clip.avi")
ConvertToYUY2()
PixieDust(5)If you want to automate this process, have a look at LoadOldPlugins.
This problem can be caused by certain plugins in your (autoloading) plugin folder. The solution is to move the problematic plugins outside your plugin folder and load them manually.
AviSynth is highly optimized. As a consequence it is possible that your computer seems to crash at random during a second pass. Try running the Prime95 stress test for an hour, to check if your system is stable. If this test fails (or your computer locks up) make sure that your computer is not overclocked and lower your bus speed of your processor in steps of (say) five MHz till the crashes are gone.
AviSynth doesn't have a full fledged gui, but several tools are available:
| Main Page | General Info | Loading Clips | Loading Scripts | Common Error Messages | Processing Different Content | Dealing with YV12 | Processing with Virtualdub Plugins |
$Date: 2008/10/26 14:18:53 $