Advanced Systems Format (formerly Advanced Streaming Format, Active Streaming Format) is Microsoft's proprietary digital audio/digital video container format, especially meant for streaming media. ASF is part of the Windows Media framework. The format does not specify how (i.e. with which codec) the video or audio should be encoded; it just specifies the structure of the video/audio stream. This is similar to the function performed by the QuickTime, AVI, or Ogg container formats. One of the objectives of ASF was to support playback from digital media servers, HTTP servers, and local storage devices such as hard disk drives.

How to Convert ASF to MKV?

In this guide we will show you how to convert ASF to MKV with ASF to MKV Converter, which can convert video between any formats efficiently. Leawo ASF to MKV Converter will be your ideal choice for converting ASF to MKV. 

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1-Drag and drop ASF files to the program. Or click  to add. Or go to “File” menu, choose “Add Video Folder” for batch conversion.

2- Customization. Press the “Profile” to choose MKV as the output format.

Moreover, you can click the button just after “Profile” to manually set the profile parameters. Many general audio/video parameters are free to adjust. If you are not a professional, choose preset profile would be better.

Try to click , there are some basic video editing features for user to customize output video.

3-When you have finished the steps above, you can hit the big button of convert, click “Output” to specify a destination folder for the converted files. And then the program will start converting ASF to MKV. The processing bar will show you required time and space.