Can’t find CC

[l.frias]

Hi guys,

I’ve been trying to read closed captions with my VE shield, but with no success.
I’m using the PAL standard (I changed the parameter in the code correctly), line 13 and 14 shows me nothing, but when I change to 21, that’s what appears:

ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿþÿÿÿÿÿÿÿþÿÿÿÿÿÿ

I’m in Brazil, so there are some latin characters and I can have problems with encoding, but I don’t think that’s the case.

I have an Arduino UNO. My video input is the composite video of my decoder (it’s the NET decoder, which is a paid TV service of Brazil). I believe the source of my problems can be:

1. The decoder itself
2. The signal line (13, 14 or 21)
3. This array: byte bpos[][8] = {{26, 32, 38, 45, 51, 58, 64, 70}, {78, 83, 89, 96, 102, 109, 115, 121}};
4. ??

Do you have an idea of what can be wrong?

Thanks!

[Michael]

This is an advanced project because it can be difficult to find the closed caption data. I’m not sure that closed caption data uses the same format in Brazil as it does in the US.

I suggest you carefully follow the procedures in the article
http://nootropicdesign.com/projectlab/2011/03/20/decoding-closed-captioning/

Are you able to see the CC data bytes displayed on the screen? They should be flashing bars near the top. Uncomment the call to [tt:3twt510c]displayBitPositions()[/tt:3twt510c] to help you align the values in the array [tt:3twt510c]bpos[/tt:3twt510c] to line up with the data bits. This is tricky, so you need to spend time studying the project article.

[l.frias]

Yes, I can see the flashing bars and that’s when data appears (well, I don’t if I can call this data…)
Anyway, thanks for your help Michael.

[markjosol]

line 13 and 14 shows me nothing, but when I change to 21, that’s what appears:

________________________________________________
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[Michael]

Hi markjosol,

This is probably an alignment problem. You need to adjust the bpos array values so that they capture the bytes. Try following the procedures described in the project for displaying the bytes on screen so you can line them up with the bpos array tick marks.

http://nootropicdesign.com/projectlab/2011/03/20/decoding-closed-captioning/

[Branzila0]

You need to install the Video Experimenter TVout libary in your Arduino libraries folder. The structure in your sketchbook should be this:

[jrmasiero]

Hi, I’m too from Brasil. Trying to read the CC from NET.
Did you found a solution?

[Author]

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