Re (captions): How are sidecar files implemented?

Hi,
I'm a beginner and am trying to understand how sidecar files work. A scenario follows.
(To cut to the chase, jump to Exporting tests, #2)
Precondition
Premiere Pro CC is open with a short video on the timeline (i.e., Sequence 01).
Preliminary steps
I created and imported a .scc file
Added the .scc file to the timeline
Enabled Closed Captioning Display
Opened up the Captions panel and tweaked the timing a bit
Saved the project
Exporting tests
I exported the video using the QuickTime format, with the Export Options set to embed in Output file. The captions appeared inside the QuickTime player after I activated the menu options. So, that seems straightforward.
I exported the video using the H.264 format with Export Options set to Create Sidecar File. For output, I get two files: Sequence01.mp4 and Sequence01.mp4.scc.
Here's where I'm stuck, conceptually. What comes next? If you open the MP4 file, the sidecar file doesn't seem to be getting picked up or read.
Thank you for your help,
-bruce.

Well, at one point, SCC files were used in submission of TV and Film content to the iTunes store. I don't know if this is still current or not. Likewise, submission for PS3 and Youtube could also take SCC files at one point.
For the other formats, sometimes they're sent alongside the video to some other downstream processing where they may take the sidecar format and mux the data into some other format for playback over the web. For example, I believe some of Adobe's web player infrastructure supports reading CEA-608 and CEA-708 captions embedded within H.264 streams. The desktop video products don't currently embed captions within H.264 frames, and so sometimes other solutions can come in to bridge that gap.
Or, on someone's website, using a custom player they've built (most broadcasters build their own such that they have control over desktop and mobile and rights management and such) have code to grab a specific SMPTE-TT file that will render the captioning data in synchronization over the video during playback. Same for EBU-TT if you're more EBU.
With the captioning sidecars, it doesn't work like QT references. The video file has no knowledge of the captioning file. So if you want to QC them after export, simply open both of them (video and sidecar) individually.

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Re (captions): How are sidecar files implemented?

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