The answer depends on what kind of system or software will be used to play or process the file on the receiving side. Telestream captioning software supports many different kinds of workflows for delivering files with closed captions to be used on file-based video servers and digital asset management (DAM).
When confirming your delivery specs with your facility or client, here are some good questions to ask:
Omneon servers support different kinds of media files, depending on the options installed on the server:
Harris Nexio servers with software version 5.71 and later can use the MCC file format generated by our captioning software for HD closed captioning.
SeaChange servers can use XDCAM HD-type MXF files with SMPTE 436M Closed Captions, or DV25 (standard def) video with DV VAUX closed captions.
Depending on your specific drop box for DG Fast, they may require either MPEG-2 Program or Transport streams with embedded closed captions for HD. For SD, they use the 720x512 MPEG-2 format also supported by Telestream captioning software using the MainConcept plugin.
CaptionMaker can embed closed captions directly into many kinds of video files for digital delivery:
CaptionMaker can add closed captions to many web video formats: QuickTime (including for iPod/iPhone/iPad/etc.), iTunes, YouTube, Windows Media.
CaptionMaker can add closed captions and subtitles to DVDs for most professional authoring programs, including DVD Studio Pro. It can also create HD subtitles for Blu-ray authoring programs.