I have been trying out Adobe's eLearning Suite and soon came across a slight bug -- Captivate would not record an audio narration. To work around it, I used Adobe Soundbooth CS4 to record the narration. I first tried saving the narration as a *.WAV file, but Captivate would not load it into the slide. I then went back to Soundbooth and saved it as an *.MP3 file. Captivate imported the new format without any problems. In addition, the *.WAV file was 687 MB, while the *.MP3 file was reduced to 590 bytes. I did not notice any quality difference between the two files; however, this was only a simple voice narration; a music or a more complex audio file will probably have a more noticeable loss of quality.
In the meantime, I sent a bug report to Adobe, which they followed-up the next morning saying that some sound cards have trouble with the audio dll file and provided this fix:
- Close Captivate 4 if it is open.
- Download the file kept at https://share.acrobat.com/adc/document.do?docid=a14e1bd9-dc10-4456-9cd2-44489809b78e
- Go to your Captivate 4 install folder (mine was located at: C:\Program Files\Adobe\Adobe Cativate 4)
- Rename nsaudio.dll as nsaudio.dll.bak or anything which doesn't have a dll extension
- Copy the file from step 1 to Captivate 4 install folder
- rename it as nsaudio.dll
- Start Captivate 4
- Try to play the audio - should go fine