From Second Life Wiki
Feature Design Document
- 10 seconds max
- PCM WAV format, 16-bit, 44.1kHz, mono.
Second Life supports in-world sound clips, which can be played to all residents within range. The maximum time any clip can be is 10 seconds, requiring longer sounds to be stitched together. There are various LSL functions that can be used to play sound clips, as well as a built-in system for gestures. Uploading a sound clip costs $10l, and the clip must be compatible with SL. As the Knowledge Base says, "Valid sounds are any .WAV file in standard PCM format, 16-bit/44.1kHz/mono or stereo (which will be converted to mono anyway), less than or exactly 10 seconds in length. (10.000 seconds is fine, but 10.001 will fail to upload; to the degree of one sample makes a difference.) Sounds cannot be saved as 8-bit, 22.05 kHz, or any other frequency. Sounds in other formats can be converted in most sound programs. There is currently no support for compression formats such as MP3."
An example of a free quality converter is r8brain.
Another very useful application for converting your sound clips to 44.1kHz .wav format is Audacity, which is available free for download at http://audacity.sourceforge.net/. Torley Linden also did a video tutorial on creating and uploading sounds, viewable at http://www.youtube.com/watch?v=QBVmFafFatE
An online converter which provides complete control over converting the specs can be viewed at http://audio.online-convert.com/convert-to-wav.
Discussion for future improvements
Relationship to other features
List of features that need to be tested when this feature changes, and why.
Upload Assets - Upload a sound clip and make sure it still works.