Streaming video stops when initiate closed captioning

Question

So our company has a streaming video feed coming from the folks over at quickplay.com.
All was good watching the streaming video in Safari (iOS 8 and Mac 10.10)...UNTIL you turn on closed captioning. Now anytime you load the feed you get a "Missing plug-in" message with "This page contains content of “application/vnd.apple.mpegurl” type. You do not have the plug-in required to view this content."
Close/restart Safari, or rebooting does nothing...happens on the Mac and iPhone. So I came across the enable Accessibility options for closed captioning on both devices in Settings and nothing.
One of our staff needs to view this feed with the CC on to monitor it. So I guess first where on both devices is it caching the preference to use CC and making them unable to stream the feed any longer. And then...why is this not working?

Answer 1

What is the subject matter of these FLVs? 
If it's Captivate screen captures, then you could have added the CC text to each slide if you had left them as FMV slides.
However, if the video content is of other things, e.g. people talking or some type of action captured with a video camera, then I believe your best solution would be to add the Closed Captioning in whatever tool you used to edit and publish the video. 
As I mentioned before, Captivate doesn't really provide a mechanism for adding CC text to on screen objects that contain audio in any form.  So for example, you cannot add CC text to an SWF that you've inserted as an animation, even though you can record and add audio to that SWF in Captivate.  Videos are in a similar position, except that they usually don't have their audio added in Captivate.  They mostly come with their audio track built in.  This means the only real way to guarantee good synchronisation of the CC text is to have it embedded in the video as well.