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Avisynth Virtual File System


AVFS is a user mode file system for Windows which exposes the output of Avisynth scripts as virtual WAV and AVI files. This allows Avisynth to serve video and audio data to applications through the file system, without using the VFW or DirectShow APIs. The virtual AVI and WAV files consume no disk space. Requires Pismo File Mount Audit Package.

Free software
File size:190kB
Old versions available
Version history available

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  Latest version (March 25, 2015)

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Supported operating systems


Avisynth Virtual File System screenshot
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Version history / Release notes / Changelog

2015.03.25 -

- Updated to newer PFM dev kit, build 174.

- Converted from "PFM Audit Package formatter DLL" to a standalone executable. This has various benefits to installation, documentation, and code reusability, but does give up some explorer integration.

- AVS script output is now exposed from a mount point under c:volumes , instead of through a virtual mount point that replaced the script file.

- Added logic to automatically reload the AVS file when it is directly modified. This is in addition to being able to edit the AVS file through the mount point.
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All features / Full description

Some of the scenarios where this is useful include:

- Serving data from 32 bit Avisynth and plugins to 64 bit encoders and media players.
- Serving data through file shares to remote systems, potentially running non Windows operating systems.
- Breaking complex scripts into stages that can be run concurrently on multiple systems.
- Serving data to encoders or players that do not support VFW or DirectShow.


Install the latest Pismo File Mount Audit Package from .

Copy avfs.dll to a folder of your choosing. The c:windows folder will work.

From a cmd prompt run:

pfm register c:windowsavfs.dll

If you later want to disable or uninstall AVFS, from a cmd prompt run:

pfm unregister c:windowsavfs.dll

then delete the avfs.dll file.

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How to prepare a DVD for editing in a NLE - Read
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