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Paskie_be
Participating Frequently
April 28, 2021
Question

Audio track getting messy

  • April 28, 2021
  • 1 reply
  • 575 views

Dear all,

I hav created this animation (cptx files) into which I inserted (Options - Add Audio) sound tracks. There is one sound files attached to each "slide". All goes well, even when I preview the project. The trouble starts when I publish the file as a video as the sound track becomes messy: it is as if I was listening to an old damaged vynil record, with scratched and the needle jumping grooves. Can someone please advise on how to prevent this?

Thanks

Pascal

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1 reply

Lilybiri
Lilybiri
Legend
April 28, 2021

Some questions because it is not clear to me.

Add Audio under 'Options' is meant to add audio to an object. But later on you talk about slide audio. Which types of audio did you use or did you combine both?

Audio files are heavy, compared with text and graphics. For interactive output (HTML5), where they need to be loaded On Enter for each slide, the recommendation for slide audio is to leave a small gap before (and after) the audio timeline:

For object audio it is not that simple, you should add 'dirty' silenec (like background audio) to the clips at the start. 

If I understand 'messy' correctly this could be due to the audio getting out of synchronization, when publishing to passive video (mp4). Keep only to slide audio and use the gaps.

P
Paskie_beAuthor
Participating Frequently
April 28, 2021

Dear lilybiri

This is how I proceeded:

As you can see I "attached" the sound file to one of the objects on the timeline. The output I chose was an mp4 video. This is the only way I found to be able to upload the animation to a web page.

Lilybiri
Lilybiri
Legend
April 28, 2021

Hmmm... terminology problem. In the screenshot I see indeed that you use object audio, which starts when the object appears (at 1 secs), since there is no pausing of the slide, I presume the object timeline is the same as the audio duration. You could have used slide audio with exactly the same result. 

What do you mean by 'animation', that is my terminology problem.  Is this an imported animation (not on the screenshot) like an animated GIF or an OAM? Or do you talk about an effect applied to objects (not in the screenshot)? 

I always embed Captivate HTMLK5 output in my blog. It is of course easier to embed a MP4 but in that case you lose all interactivity, and as you have experienced can have audio issues. To embed a HTML5 output folder, you need to upload the folder to any webserver supporting JSON, then you insert the URL in an iFrame in any web page using HTML.  Example for a fixed size HTML5 output from one of my most recent blogs:

<p><iframe src="https://www.lilybiri.com/published/PoolReview/index.html" width="800" height="490"></iframe></p>

I use a subfolder on my domain as webserver (...com/published). 

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