Help required with an AviSynth script error

[RustiX]

Using MeGUI I was trying to encode a video which was in AVI format into an MKV. Unfortunately when the script is to be created i get the following error:


AviSynth script error:
AVISource: couldn't locate a decompressor for for fourcc h264


The following are the step I took before getting this error:

Started MeGUI 0.3.4.0
Selected Tools>AVS Script Creator
Clicked on the ... button besides Video Input and chose the video file (which was an AVI)
Clicked on the Save button at the bottom of the AVS script creator window


After this step I get the above error. What does this error mean? Is there a way I could resolve it?

All help is greatly appreciated! :)

Some additional info which might be necessary:

Operating System: Windows 7 Ultimate
CCCP Installed
XVid codec installed
AviSynth 2.58 installed

[flebber]

Note for Windows 7 Users
check this thread -> http://forum.doom9.org/showthread.php?t=146910
Guide for installing HDConvertToX on Windows7 by rickatnight11 -> http://forum.doom9.org/showthread.php?p=1318934#post1318934

Have you tried this, as posted in HDC thread

[RustiX]

Doesn't that mean I have to install K-Lite Codec Pack?
Btw I did try out the tweaker but it messed up file associations the last time i used it

[Emulgator]

I also have just fought my way through Win7U64.
What helped in my case:

(In your case: Uninstall CCCP first),

Then install ffdshow 3305 32bit + 64bit, if applicable.

Get Direct Show filter Tweaker 3.0:
First window: Radiobuttons: Select all ffdshow decoders
(this unselects Microsoft decoders).

You may keep the rest of the two other windows ticked.

Then Start-> All Programs -> ffdshow 32bit -> VfW Configuration -> decoder -> codecs

Here many were unticked, I ticked them almost all to libavcodec.

You should be sure that H.264/AVC should be decoded by libavcodec in ffdshow.

The same for 64bit, if applicable.

You may check this with Graphedit, just drop the file onto the window, the graph is built
and ffdshow should be the one which gets to decode the source, then to VideoRenderer.

Now my beloved Huffyuv and Canopus Lossless can be used again by other software...