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  1. I am using the Ematic on- air digital TV recorder (from Walmart $30-$40). I'm interested in extracting good srt subtitles and I think I've figured it out with the help of comment #7 CC Extractor. The situation is that sometimes when I record TV programs, the extracted subtitles (using CC Extractor v.65) are perfect. Other TV programs on the same channel, however have subtitles that repeat in a strange way.
    Even if I delete (for example) even or odd subtitles, the result still has some repeating of words. However, if I tick "For roll up captions, don't duplicate lines..." (see screenshot, red circle), then the subtitles appear to be perfect. Question #1 Can someone explain why the same TV station has 2 different kinds of caption protocols? Question #2 And what does "roll up captions" mean? Any additional comments on this topic to further clarify what is going on would be helpful. I have attached a sample recording ( W2 5MB) and two extracted srt files. Subtitle W1 is the default setting of CC Extractor which gives repeated words. Subtitle W2 is correct by ticking "For roll up..." in CC Extractor.
    I have also attached the original ts file (from the digital recorder) which is used with CC Extractor to get the subtitles.
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    Last edited by jimdagys; 25th May 2016 at 23:52.
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  2. Dinosaur Supervisor KarMa's Avatar
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    Roll up subtitles will appear a character at a time on the TV screen, as if someone were typing out the words in real time. And then when that line is completed, it will rise up a line, making room for the next line to appear. As apposed to having all the text showing up at once.

    I guess when the CC decoder finds duplicate lines, it knows to display them in this roll up fashion.

    Update: All the TV station has to do to switch between normal CC and roll-up CC is whether or not there are duplicate lines. When there are duplicate lines, that triggers the decoder to do roll-up. Their rational for switching between the two is up to the producer I guess, what they think the audience would prefer.
    Last edited by KarMa; 26th May 2016 at 09:42.
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    Originally Posted by KarMa View Post
    Update: All the TV station has to do to switch between normal CC and roll-up CC is whether or not there are duplicate lines. When there are duplicate lines, that triggers the decoder to do roll-up. Their rational for switching between the two is up to the producer I guess, what they think the audience would prefer.
    Somebody connected with the show or the captioning service must decide which style to use, and it can change periodically. I have been recording one program for my sister for some time. I pay attention to the closed captions because she loans her discs to a friend who has some hearing loss. Previous seasons (most of which are still being repeated in rotation with the latest one) have roll-up captions, but the current season does not.
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  4. Dinosaur Supervisor KarMa's Avatar
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    I know NBC Nightly News does roll-up along with PBS Frontline and CBS Sunday Morning.
    Last edited by KarMa; 26th May 2016 at 18:50.
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    Hey guys. I have a problem with Roll-Up mode.
    I tick "For roll up captions, don't duplicate lines..." and extract subs from ts-file,
    but this function didn't work and duplicate lines remained in place.
    Tell me what else I can do?
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