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Extracting closed captions from analog NTSC captures

Discussion in 'Video - Software discussion' started by miker00lz, Oct 11, 2013.

  1. miker00lz

    miker00lz Member

    May 21, 2009
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    I am capturing a few old laserdiscs, and am trying to extract the closed captioning information with ccextractor. I captured to lossless (lagarith) AVI files at full 720x480 @ 29.97 FPS. I'm using an older WinTV PCI card with the bt878 chip.

    The capture seems to be perfect, but ccextractor detects no captions at all. I haven't deinterlaced or anything. I used the raw capture output file. The disc definitely has captions, as my TV decodes them if I play the laserdisc directly.

    Any ideas what's going on? Thanks!

    Here's a sample screen from the raw capture output. The quality should easily be good enough to detect the captions, no?


    EDIT: After a bit of searching, I found that I need to capture at 720x486 because 720x480 cuts off the line 21 data. I am now doing so, but still am not able to extract any captions.
    Last edited: Oct 11, 2013
  2. attar

    attar Senior member

    Jun 17, 2005
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