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To be fair, I'm talking about the old PAL-based teletext and not about DVB teletext. Also, computers are now everywhere so the 888 page can be inserted with min
by zinekeller 4y ago
To be fair, I'm talking about the old PAL-based teletext and not about DVB teletext. Also, computers are now everywhere so the 888 page can be inserted with minimal effort unlike back then that it requires coordination with different teams.
- kvm000 4y agoI was talking about the older PAL-based teletext as well - but you're right, I understand it was different in terms of equipment originally with the full-screen data feeds. Separate from DVB, the old PAL OP42/47 teletext payload gets inserted into the MPEG-TS using SMPTE 2038[1] then when decoded, it would go into regular ancillary data of the uncompressed stream per ITU-R BT.1120-7[2]. The broadcast industry really loves standards[3]. [1] https://ieeexplore.ieee.org/document/7290549 https://ieeexplore.ieee.org/document/7290549 [2] https://www.freetv.com.au/wp-content/uploads/2019/08/OP-42-Closed-Captioning-Issue-5-May-2018.pdf https://www.freetv.com.au/wp-content/uploads/2019/08/OP-42-C... [3] https://xkcd.com/927 https://xkcd.com/927