Improve results when subpage receives multiple copies of the same row

ali1234 / vhs-teletext

Software to recover teletext data from VHS recordings.

GNU General Public License v3.0

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Improve results when subpage receives multiple copies of the same row #39

Closed ali1234 closed 4 years ago

ali1234 commented 4 years ago

Sometimes the stream will contain duplicate rows, and in some cases they can be mostly empty. This appears to be caused by incorrectly deconvolved filler packets.

Currently subpage reads packets in broadcast order and insert them into a table. At the end the table will contain the last example of each row/dc received. When there are a lot of filler packets, this means those rows nearly always end up empty.

filler-error.t42.gz

ali1234 commented 4 years ago

Note: A VBI capture of this would be more useful.

ali1234 commented 4 years ago

Fixed in 8dcadc8b0075c82ef

ali1234 commented 4 years ago

This turned out to be caused by non-teletext lines being mis-identified as teletext, for example: