Sound Quality

When I publish video content and some voice overs, the quality of the sound is somewhat distored on certian computers, yet when I listen to the orignal file on the same computers, they sound perfectly fine.

I have set the quality to settings as high as they can go in Storyline but can't seem to find a fix. I have recoded  the video to lower bit rate and sample rates but still the same issue.

I have even replaced the published video file with the higher quality file but to no avail.

Has anyone expereinced this? It seems to make the audio of the video sound like the person talking has a bit of a lisp. It only happens on some computers but as I said, when the orginals are played on those same computers, there are no issues.

3 Replies
Christine Hendrickson

Hi Mark,

This is happening for both video and narration you've recorded, correct?

For the audio files, it may help if you convert your audio files to 16 bit 44 KHZ PCM WAV for best results. The articles (here and here) may help with quality of the audio files. 

Now, what concerns me with the video is that you're replacing the compressed version with the original, but still having this problem. How are you viewing the project when this happens? You mentioned you're trying this on multiple machines, but have you uploaded to a web server/LMS, or are you running this locally through a web browser? 

Try clearing your browser cache, testing in a different web browser, or uploading to a web server before testing, if you haven't already.

Let me know if you see any improvement. 


Mark C

Hi Thanks Christine,

The issue still remains. It is only when viewing the video on a virtual PC that the sound quality goes funny. IT have changed several settings and nothign seems to improve the quality. Each time it comes out exactly the same no matter what setting I use. I have changed to high and low bit rates to no avail.  We have also cleared the cache and it still comes out as of there is a lisp on the virtual computers when viewed through an LMS

Christine Hendrickson

Hi Mark,

Sorry - can you clarify one thing, please? You mentioned that this only happens when viewing the video on a "virtual PC" - by this you don't mean through an actual virtual machine, where you run a separate instance of an OS through a program like VM Ware, correct? I don't believe this is what you're referring to, but I just want to make sure. If it is, then that's not all that surprising - quality can drop quite a bit when running through a virtual machine. 

Are you able to share a link tot he project that's been uploaded to the LMS? If so, I'd be happy to take a look and see if I hear the same "lisp" issue. Or, you're welcome to post the .STORY file here. Just keep in mind that if it's too large, it may not post - if that's the case, you can import the slide or slides that are having trouble into a new project and share that:

Importing from Another Storyline Project - E-Learning Heroes

If you want to keep the content private, you're welcome to send me the link in a private message.