Compression for reducing file size to play on iPad

Jun 13, 2013

Hi all!

I'm wondering if anyone can shed some light on some compression best practices.

For example - I know with graphics, it always makes sense to crop and scale graphics outside of Storyline before bringin in (rather than using the crop feature within Storyline) because SL retains the whole file.

Is there anything like this for audio or video? My understanding is that SL automatically converts the audio to mp3, so is there any way to make the files in the published output even smaller? Would it help to have them as mp3 before bringing into SL for an added layer of compression? What about video? Is this the same thing?

Another thing - is there any research that shows a custom programmed menu (rather than using the SL player) reduces file size?

Thank you!


5 Replies
Nick Elkins

Thanks, Justin. The reason I ask is because I assumed the same thing was true for graphics. But in our extensive testing, we found that wasn't the case.

We created a 15 minute course that included about 100 large raw JPEGs (5 MB+ each) and then created the same course using GIMP to crop and scale the images outside of Storyline before inserting into the .story. Our results were amazing. We took a 60 MB+ published output zip file down to less than 17 MB just by scaling and cropping before bringing in.

I guess what I'm asking is if we were to insert only mp3s, rather than WAV or the like, would that serve any good? Would Storyline further compress the mp3s we inserted? Or would the published mp3 output be roughly the same size as what we originally put in?

Thank you!


Justin Grenier

Hello again, Nick.

My testing shows that your scenario wouldn't add much efficiency:

Please let us know if you need anything else.  Thanks!

Christine Hendrickson

Hi there Nick,

Just wanted to pop in and apologize for the subscription issue. We had it working in the past, but we had to implement a moderation feature that would cut down on the number of spam posts on the forums. When we put that new system in place, it caused an issue with automatic subscriptions. 

When you respond to a new thread, you'll need to manually resubscribe to a thread. I know it's not very user-friendly and again I'm sorry for the trouble. Hopefully we'll have this back up and working normally soon :)

Thanks and have a great day!

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