closed captioned question

[paulmars]

How can I tell if an avi or mpg video file is CC without playing it?

Tks,
paul

[handyguy]

I never saw an AVI or MPG with CCs.

[paulmars]

I m ignoranrt. I have a deaf friend and some of the bit torrents that I have downloaded for her (mpg, avi) and burned to DVD have been CC and others have not. All were prograns that were orignally CC. I searched on torrent sites and found nothing about CC. I asked at a torrent forum and it was suggested that I look in the nfo file. I have never seen info on CC in an nfo file.

[JohnnyMalaria]

AVIs can contain closed captions.

Without playing an AVI to find out, you'll probably need to dump the RIFF structure. Basically, this will identify what kinds are tracks are present - usually video and audio, sometimes text.

e.g: http://www.thugsatbay.com/tab/?q=other_tabriffdump (I haven't tested it).

[paulmars]

http://www.thugsatbay.com/tab/?q=other_tabriffdump (I haven't tested it).

does not work for me. Any other ideas?

[handyguy]

I'm Deaf, if I need subtitles I just use one of the subtitle sites, they are free. Subscene.com Opersubtitles.org

I never saw an avi with CCs & I have watched thousands of Avi's. I don't know how they would do it, as CCs are entered on line 21.

[AlanHK]

I never saw an avi with CCs & I have watched thousands of Avi's. I don't know how they would do it, as CCs are entered on line 21.

Perhaps he means "hearing impaired text" that you see in some subtitles:

~ Music
[man laughs]
etc.

[JohnnyMalaria]

I don't know how they would do it, as CCs are entered on line 21.

For use on a computer, CCs can (and have been) encoded into AVI.

Some sofware/hardware combinations will convert the AVI-embedded information into line 21 data.

DV can embedded CC and Teletext within the digital data stream. My DSR-11 can detect line 21 data, encode it into the DV stream and record to tape. You can edit the text information (via FireWire and a computer) and, with the same deck, send it back to any TV that has a line 21 decoder.

[handyguy]

That's nice. However, that doesn't account for why I never see one. Might not be very practical when you can just use subtitles?

But the person wanted to know how they could find our if an avi has CCs or not.

[JohnnyMalaria]

As I suggested, without playing it, you need to dump the RIFF structure and see if there is a text stream.

This won't work with some, though. There are some products that support direct coding of Line 21. i.e., the video frames contain the (usually) hidden lines. See http://www.cpcweb.com/ for examples.