user3005: I need to add closed captioning to a short video that will be broadcast on our cable TV system.  The cable system will accept MPEG-2, QuickTime MOV, or AVI/DV formats.  This is in the United States, and I'm guessing that we will need both EIA-608 and CEA-708 formats.  Because I am not actually producing the video itself, and I don't have it yet, I don't know whether it will be in a standard-definition or high-definition format.  I am presuming the latter, but information on either could be helpful.
What software (preferably free and/or open-source) can help with this task?  I have tried Google, and I have tried skimming the documentation of some of the packages out there (e.g., Kdenlive) to no avail.  I can use Linux or Windows software for sure, and I can probably find someone with OS X if needed.

user-1: You could check out these links to see if they provide what you need:
http://www.theneitherworld.com/mcpoodle/SCC_TOOLS/DOCS/SCC_TOOLS.HTML
Caption Maker Pro:
http://www.cpcweb.com/
And of course Scenarist and Encore, although both are DVD oriented you should be able to produce at least MPEG-2 with closed captions embedded:
http://www.rovicorp.com/products/distribution/content-production-tools/scenarist-bd.htm
http://www.adobe.com/products/encore.html

Closed-captioning support
Import line 21 files to add closed captions to your DVDs (NTSC titles
  only).


3005: <p>I need to add closed captioning to a short video that will be broadcast on our cable TV system.  The cable system will accept MPEG-2, QuickTime MOV, or AVI/DV formats.  This is in the United States, and I'm guessing that we will need both <a href="http://en.wikipedia.org/wiki/EIA-608" rel="nofollow">EIA-608</a> and <a href="http://en.wikipedia.org/wiki/CEA-708" rel="nofollow">CEA-708</a> formats.  Because I am not actually producing the video itself, and I don't have it yet, I don't know whether it will be in a standard-definition or high-definition format.  I am presuming the latter, but information on either could be helpful.</p>

<p>What software (preferably free and/or open-source) can help with this task?  I have tried Google, and I have tried skimming the documentation of some of the packages out there (e.g., Kdenlive) to no avail.  I can use Linux or Windows software for sure, and I can probably find someone with OS X if needed.</p>
 -1: <p>You could check out these links to see if they provide what you need:</p>

<p><a href="http://www.theneitherworld.com/mcpoodle/SCC_TOOLS/DOCS/SCC_TOOLS.HTML" rel="nofollow">http://www.theneitherworld.com/mcpoodle/SCC_TOOLS/DOCS/SCC_TOOLS.HTML</a></p>

<p>Caption Maker Pro:</p>

<p><a href="http://www.cpcweb.com/" rel="nofollow">http://www.cpcweb.com/</a></p>

<p>And of course Scenarist and Encore, although both are DVD oriented you should be able to produce at least MPEG-2 with closed captions embedded:</p>

<p><a href="http://www.rovicorp.com/products/distribution/content-production-tools/scenarist-bd.htm" rel="nofollow" title="Sonic Scenarist">http://www.rovicorp.com/products/distribution/content-production-tools/scenarist-bd.htm</a>
<a href="http://www.adobe.com/products/encore.html" rel="nofollow" title="Adobe Encore">http://www.adobe.com/products/encore.html</a></p>

<blockquote>
  <p>Closed-captioning support</p>
  
  <p>Import line 21 files to add closed captions to your DVDs (NTSC titles
  only).</p>
</blockquote>
