Audio Video glitch

Jun 22, 2014

Hi,

I'm experiencing a strange glitch in the audio of mp4 files that I have imported into Storyline.

At the beginning of each slide containing a video, a very short burp (that's really the best word I can come up with) of audio occurs.

It sounds a lot like the audio starts to play, and then stops...very quickly.

Like, a fraction of a second.

Then the video file plays correctly.

But it's on ALL my video slides, and I've never experienced anything like this.

It's NOT present at all in the source videos...only when they get into Storyline does this problem appear.

It happens ONLY when I preview or publish.

It does NOT happen when I play the video directly from the timeline, nor when I am within the Articulate Video Editor dialogue.

So far I've tried:

Re-encoding the file at a different audio bit rate (no luck)

Changing the transition (I initially was using a PUSH, but I've also tried a fade, and NO transition...same thing).

The only thing that I've managed, as a workaround, is to re-encode the video files to contain no audio, and then import the audio and video separately (I created the videos using Camtasia, where I combined screen-capture and VO).

Any ideas?

I really don't want to re-encode and re-edit media for 68 slides.

Thanks!!

7 Replies
Christine Hendrickson

Hi George,

A couple of things:

Where is your project file for Storyline located? Are you working with it locally?

  • Work on your local drive (your C: drive). Working on a network drive or a USB drive can cause erratic behavior, including file corruption, loss of audio, and other unexpected behavior. 
  • You should also make sure the directory path to your project files and your published output is less than 260 characters (for example C:\Articulate).
  • Avoid using special characters, accents or symbols in your file names (this includes spaces and underscores).

Additional information regarding "Naming Files, Paths, and Namespaces" in Windows operating systems can be found in the following Microsoft article.

Also, please make sure you're importing the MP4 files from a local source, as well. 

Please make sure you're running the most recent version of Storyline. Articulate Storyline Update 5 includes bug fixes, performance improvements, and HTML5 output enhancements. Click here for details.

If you still see this issue, are you able to share one of the MP4 files here, so we can take a look?

Thanks!

George Tuft

Thanks.

I'm definitely working on a USB drive...though thru a hi-speed connection.

I'll see if switching to a local drive helps.

My workaround has proven to be not all that cumbersome...though I'd prefer a straight solution

I've often worked off USB, and never had this issue...so I guess there's a first time for everything.

Ashley Terwilliger-Pollard

Hi George,

Please keep us posted if working off a local drive on a brand new file continues to exhibit this behavior. Although you haven't run into a problem before with a USB drive, it's a known cause of erratic behavior and file corruption as Christine mentioned - so we'd obviously want to avoid that! You could also try importing your existing course into a new course as described here to resolve any odd behavior. 

Zio Fonta

I have a similar problem right now. I inserted several mp4 video with audio tracks in slides, and after publishing, each of these slides playback the audio (contained in the video) with a small "jump" at the beginning. I checked the source mp4 and the published mp4 (in "story_content" folder) and there is no problem with audio in them, however in playback the "jump" occurs at the beginning each time.

Zio Fonta

Hi Alyssa, thanks for answering, I'm testing on a local webserver (XAMP) as I always do, this bug occures on every video that has audio starting from the beginning. I asked other developers and everyone confirmed to me it is a known bug of the video player of Storyline. The only workaround they found, is to insert audio (inside de mp4 video) after at least 1 second from the start. It seems that in the first moments of loading, the video player is calling some actionscript that causes the "jump" of the audio track...