This article is to show you how to convert video files from Youtube to ASF(Advanced Streaming Format) for enjoying your favorite youtube video on windows movie maker digital mdia servers, http servers, and local stroage devices such as hard disk drives on Mac OS. Follow it and you can get ASF format movies after few clicks.

What is ASF?

ASF is based on serialized objects which are essentially byte sequences identified by a GUID marker.

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.

The most common filetypes contained within an ASF file are Windows Media Audio (WMA) and Windows Media Video (WMV). Note that the file extension abbreviations are different from the codecs which have the same name. Files containing only WMA audio can be named using a .WMA extension, and files of audio and video content may have the extension .WMV. Both may use the .ASF extension if desired.

iSkysoft iTube Studio for Mac can help us do that, which can download and convert YouTube FLV videos to all popular video and audio formats, such as converting YouTube FLV to ASF on Mac.

You can download FLV videos from YouTube, Yahoo, Google, Break, Metacafe, ifilm, Dailymotion, hulu, fox, ku6.com, MySpace, Gofish and more video-sharing websites on mac os.

As a Free Mac YouTube Downloader, it can automatically detect the YouTube video files from the YouTube web pages you have opened and download multiple files at a time.

Convert youtube videos to popular video and audio formats
With it, you also can convert youtube FLV videos to popular videos formats and extract audio from youtube video to MP3, WMA, M4A, AAC on Mac OS.

It has a functional FLV player which lets you play the online and local videos on your Mac with great quality.

Step 1, Launch iTube Studio and Login your Mac account

If you have free download or purchase this  iSkysoft iTube Studio for Mac, double click to run it.
When you first launch the program, you will get a pop-up window asking you to input the password of your Mac login account. This step is very important for the program’s Sniffer function. Please follow the steps as stated in the pop-up window below: (more…)