It seems I’m back in the DVD closed caption business. This has always been a multiple step process for me, but I assure you DVDs can support line 21 closed captions.
The trick is to use DVD software called “DVD LabPro 2” I can’t recommend it for authoring but one thing it does very well is muxing scc files into mpg2 files to deliver DVD files. After that, edit the IFO with IfoEdit to turn on closed caption flags. Then you can burn a DVD that, in fact, will deliver line 21 data when played on a standard DVD player. Your TV will then display them when the CC button is pressed on your remote control. (will not work thru HDMI)
Having said that, the whole process is a royal pain. Maybe 6 or 7 steps to get there.
Understand that this is not a 486 line vs 480 line issue. With DVD LabPro2, the scc data is muxed into the 480 x 720 mpg2 file as it is converted to VOB files. It matters not that 480 line files do not have a place for line 21. The DVD player inserts the actual line 21 signal your TV or monitor is looking for.
Sony Vegas 10e will greatly simplifies this up to a point. Creating captions with Vegas 10e couldn’t be easier. Exporting the SCC file is simple. In fact, an scc file is automatically generated when any video file is rendered.
But as far as I can tell, with Vegas there is no muxing of the scc data with the mpg2 file. But if you render to a 486 line file the the CC data is visible in the upper part of the frame when played on Windows media player. This is not “muxing” as I understand it, this is “inserting” and not the desired function I am looking for.
All this said, Vegas 10 is a great way to generate the captions. But for now a 3rd party solution is necessary to finish the DVD.