Extract Eia 608 Captions Ffmpeg
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#1778reopenedenhancement
Ffmpeg -i which only searches a short distance into the input file. To coerce ffmpeg to search further for the subtitle stream, use options: -probesize -analyzeduration which will cause ffmpeg to search until the first of those limits is reached. Curious on CEA-608 captions and how they differ from CEA-708?This article describes some of the benefits of closed captioning live content while discuss the.
| Reported by: | Owned by: | er.anshul.maheshwari@gmail.com | |
|---|---|---|---|
| Priority: | wish | Component: | undetermined |
| Version: | git-master | Keywords: | |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | no | |
| Analyzed by developer: | no |
Description
Change History (13)
comment:2 Changed 8 years ago by cehoyos
- Component changed from FFmpeg to undetermined
- Keywordsclosedcaptionsubtitleteletexteia608708 removed
- Priority changed from normal to wish
- Status changed from new to open
- Type changed from defect to enhancement
- Version changed from 1.0 to git-master
comment:4 Changed 8 years ago by reimar
comment:6 Changed 5 years ago by er.anshul.maheshwari@gmail.com
- Owner set to er.anshul.maheshwari@gmail.com
comment:7 Changed 5 years ago by er.anshul.maheshwari@gmail.com
comment:8 Changed 5 years ago by er.anshul.maheshwari@gmail.com
- Resolution set to fixed
- Status changed from open to closed
comment:10 Changed 5 years ago by er.anshul.maheshwari@gmail.com
- Resolutionfixed deleted
- Status changed from closed to reopened
comment:11 Changed 5 years ago by cjplay93
comment:13 Changed 3 years ago by bleighty
However, in the compressed domain, an end user would be unlikely to see captions in this form. Quite frequently the 608 (or 708) data packets are stored in the MPEG-2 user data, or as H.264 SEI messages. ATSC A/53 defines both methods.
As an aside, things are a bit different in the HD world. Baseband HD video is usually transported over HD-SDI. In this scenario, captions and other metadata are stored in the vertical ancillary (VANC) data. This VANC data can be partially (or sometimes completely) retained when capturing baseband HD-SDI into a file. However, it's more common for captions to instead be extracted from the VANC, and inserted into MPEG-2 user data, H.264 SEI messages, or a standalone caption file during capture.
Most of that is fairly off-topic, but I find captions interesting (and endlessly frustrating).
Derek