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kattk93075533
Participant
May 13, 2017
Question

Closed Caption capture

  • May 13, 2017
  • 1 reply
  • 535 views

I would like to capture to the harddrive a SD-SDI video signal that already has closed caption data embedded in it (EIA 608).

I have read about using Blackmagic cards and that Premiere can "work" with closed caption, but I haven't found anywhere where it is specifically stated that PP will capture a file and keep the CC data intact.

If I get past that question - the next is can I cut/trim the file and render it so that the CC data is intact? Is there a limitation on the rendering (I'd like to export as H.264 for example).?

If I can get this far, then lastly, can I add a slide prior to rendering. As I understand the CC data itself, if I cut the front off a video file with CC data in it, it won't effect the CC data following that, other than the possibility of an incomplete sentence on-screen when the home TV decodes it. So presumably, cutting 1 hour out of the middle of the file, would also not impact the CC (again, other than the mid-sentence scenario).

I don't want to decode the CC data, I don't want to add more data, I simply want to preserve the captured data and export it into another format.

If I can get past all these questions, then I'd like to ask the same questions about HD-SDI (EIA708).

Thank you for your help in advance, please be gentle, my first post an a few years.

Katt

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    1 reply

    mikeg37672631
    mikeg37672631
    Participant
    July 27, 2017

    Hey Katt -

    Not sure if you got this figured out or not. I don't have much experience with capturing video with captioning through Premiere, but I do have some with captions in Premiere.

    Premiere treats the captioning data (both 608 & 708) as an additional line of video within the timeline. This will show up in video lines 2 and 3 for example. If you have thumbnails turned on in your timeline view you will see that instead of images, you have words from the captions themselves. The other cool thing is you can treat it like video, making cuts to the caption data in the timeline with your video.

    There is a caption window you can pull up to edit/adjust, change, add, delete, or type new captions from the data in the sequence. Exporting is tricky though. Typically out of Premiere you can only export 608 data; however, in some instances I have left the 708 data in and exported from Premiere via AME and had success embedding 708 into the file. The reason its tricky is there's no area to specify what to create on export (608 or 708), but have created both before. I hope in the future they add this feature as I see it as important.

    The other thing to keep in mind is not all codecs are created to carry captioning. For example, in Premiere you do not have the option to embed captioning in an H.264 file. You can with other codecs, but unfortunately not H.264 within Premiere.

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