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Captions

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Captions

Postby Al White » Wed Feb 05, 2014 3:01 pm

I see two ways to include captions - using the CC button on the tool bar (right side), and attaching them to slides or callouts with the sounds. It seems that when publishing as MP4, both sets of captions are available. Is it possible to turn off the burned-in captions for MP4 publishing? So that they are available through the player, but not burned into the MP4 video itself? That way, we can use the same project for delivering as SWF (with captions burned in) and as MP4 (with captions available through the player, but not burned in).

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Re: Captions

Postby Rado » Wed Feb 05, 2014 3:48 pm

Al, let me explain this a little bit, as it may not be obvious at first. What the "CC" button on the right-side toolbar does is that it places a "Closed Caption" element on your slide. This element is just a display placeholder for closed captions and allows you to customize the position, color, font size, etc. It is just a container, and without it, the captions would not be burned into the slides.

To enter the caption text, you edit the sounds - the sound dialog allows you to see the sound waveform, and edit the caption text at the same time. The waveform makes it easier to position the caption text accordingly while editing. A Viewlet can have multiple sounds on a single slide - the main timeline slide, but also event sounds when a balloon appears, or when an interactive action occurs. You can add captions to all sounds, and they will get mixed together accordingly.

Now back to your original question: when you place a CC element on a slide, it will "burn in" the caption data into the slide. This is required for SWF output, but for video output (FLV or MP4) we also create a text file with SRT extension which many video players support. However, we also "burn in" the captions for better compatibility.

Right now it seems the only way to get rid of the "burned in" captions is to hide the Closed Caption layer (clicking the "eye" button on the timeline) before publishing to video formats, and show the layer when publishing to SWF. The caption file will still be generated for the video output, but the captions will not be burned in.

Of course, this would be a tedious task if you have too many slides with individual Closed Caption elements, but it would work well if the Closed Caption element/layer was only placed on a Master Slide. Hope this helps!

We'll think about a way to make the switching easier/faster.

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Re: Captions

Postby Al White » Wed Feb 05, 2014 4:34 pm

Thanks for clarifying that! Yes, it would be nice if there was a publishing option to toggle the burned in captions - for example, adding a new publish option (MP4 with burned in captions) to the existing three choices (FLV, SWF, or MP4). I don't know if a custom .qframe could handle "closing all the eyes". I will investigate putting the captions on a master slide; that might also be a suitable work-around. Thanks for the quick answer!

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Re: Captions

Postby James » Wed Feb 05, 2014 5:10 pm

Al,

We recommend using the CC element on the Master Layer vs Slide by Slide anyway since a user will expect the location of the text to remain consistent in a course. This makes it easy to hide before publishing to MP4 until a config option can be added. There is enough space to do this already without having to add another "type".

ccmp4.png

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