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Exporting Closed Captions from ProRes Source

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Bryan Walls
Exporting Closed Captions from ProRes Source
on Mar 13, 2017 at 9:32:25 pm

I have a workflow that takes ProRes files are 101 Mb/s recorded on an AJA KiPro Ultra with embedded captions, and saves them out at MXF OP1a files in XDCAM HD 50 720p/60, using embedded captions.

The ProRes file has both 608 and 708 captions.

The MXF is only coming out with 608 captions only.

How can I get both sets to carry over? Would I have to export an MCC sidecar, and then drag it to the timeline? Or is that just a bug?


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James Brooks
Re: Exporting Closed Captions from ProRes Source
on Mar 13, 2017 at 10:37:14 pm

Hi Bryan

ccConvert will extract the embedded 708 directly to an MCC with no change in the captions themselves (e.g. the 708 packets will be extracted from the ProRes and written directly to the MCC).

Cheers, James

http://www.drastic.tv


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Bryan Walls
Re: Exporting Closed Captions from ProRes Source
on Mar 13, 2017 at 10:43:04 pm

I do have a functional workaround, but it's ugly.

I did find that it was possible to:

Drag the file into the Adobe Premiere timeline.
Choose File > Export > Media…
Set Format to MPEG4.
Uncheck the Export Video box.
Click on the Captions tab.
Set
Export Options to Create Sidecar File
File Format to Scenarist Closed Caption file (.scc)
Click Export
Drag the SCC file you created to your timeline. Adjust the captions so they line up with the audio track/existing captions.
In the Project tab, select the SCC file.
Right-click on the SCC file, and select Modify > Captions from the menu
Change Standard: from CEA-608 to CEA-708. Leave Stream as Service 1.
Click OK.
Choose File > Export > Media…
Set
Export Options to MXF OP1a
File Format to XDCAM HD 50 NTSC 720p60
Click on the Captions tab and Select
Export Options to Embed in Output File
Click Export

This will give you an MXF file with both CEA-708 captions for normal playback, and CEA-608 captions for outlets that downconvert to SD formats. But it's sure not pretty or user friendly.


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James Brooks
Re: Exporting Closed Captions from ProRes Source
on Mar 13, 2017 at 10:56:32 pm

Cool hack ☺ This requires that the 708 CC is the same of 608 CC and you only want service 1, but still, nicely done

Cheers, James

http://www.drastic.tv


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