Q: I'm trying to create MPEG-4 (.mp4), 3GPP (.3gp) and/or 3GPP2 (.3g2) format files on my Windows PC using the 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: The AAC and AMR compressors that ship with QuickTime 6 are only available to licensed applications 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 or AAC formats without first obtaining a valid license from one of the following licensing organizations: Contact Via Licensing Corporation for AAC licensing information. Contact VoiceAge for AMR licensing information. However, you can encode audio to the AMR or AAC formats using the QuickTime Player application on Windows if you have already upgraded to QuickTime Pro. On Macintosh, applications can freely create content with these formats without the requirements mentioned above. Document Revision History| Date | Notes |
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| 2004-05-20 | minor wording changes | | 2004-04-05 | New Document |
Posted: 2004-05-20
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