AU file is a compressed digital sound format launched by Sun Microsystems. AU file was originally a digital sound file under the UNIX operating system. As the early Web Server on Internet is mainly based on UNIX. AU file is still the commonly used sound file format in Internet nowadays and the LiveAudio in Navigator Browser also supports Audio format.

ASF is Advanced Streaming Format. It is an extensible file format developed primarily for storing synchronized digital video, audio, subtitle streams, or transmitting data on the internet. ASF is also a multimedia container of Windows Media Video or Windows Media Audio.

Windows includes au decoder. You may convert au to asf file directly.


Download ASF Converter which can convert au to asf file. Select an au file, change audio encoding bitrate if necessary,  rename the output file to asf extension.

SMF is short for Standard MIDI File, known as RMID. The format is designed to achieve interchangeability. SMF includes 2 kinds of formats: format0(common in ringtones) and format1. It is also divided into 3 types: type 0, type 1 and type 2, among which type 0 and type 1 are the most commonly used. Type 0 is to mix all tracks into one multi-channel track, while type 1 is to make MIDI data in different channels on their respective tracks.

To convert SMF or RMID to asf, we will publish a special product.

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