Movie export with AMR audio
Q:
I'm trying to create movies containing AMR audio on my Windows PC using the QuickTime ConvertMovieToFile function. The resulting files always contain valid video, but no audio. No errors are being returned from this function. What am I doing wrong?
A: I'm trying to create movies containing AMR audio on my Windows PC using the QuickTime ConvertMovieToFile function. The resulting files always contain valid video, but no audio. No errors are being returned from this function. What am I doing wrong?
The AMR compressor that ships with QuickTime is only available to licensed applications via a special Software Development Kit (SDK) on Windows.
Therefore, you can't use any of the QuickTime movie exporter functions such as ConvertMovieToFile from your own application to encode audio to the AMR format without first obtaining a license.
Contact VoiceAge for AMR licensing information.
Once the AMR patent license is obtained, contact Apple Software Licensing for the AMR SDK license. When contacting Apple Software Licensing please indicate that you are interested in the AMR SDK license and include a full company name, address and contact email address.
Document Revision History
| Date | Notes |
|---|---|
| 2010-02-24 | Removed references to the AAC format since it no longer requires a license. |
| 2009-03-16 | Updated licensing requirements |
| 2007-04-13 | Updated contact URL for Via Licensing Corporation |
| 2006-01-25 | misc. changes |
| 2006-01-06 | fixed broken link |
| 2004-05-20 | minor wording changes |
| 2004-04-05 | New document that this Q&A discusses use of the QuickTime AMR audio compressor on Macintosh and Windows |
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