- Extract Eia 608 Captions Ffmpeg Free
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Line 21 VBI captioning is indeed the standard for standard definition, baseband digital and analog video. It's also and the standard for some interchange formats like D10 / IMX, both of which use MPEG-2's 4:2:2 profile to encode a 720x512 image for NTSC, which includes all VBI data (CC and VITC etc).
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
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
Sep 03, 2012 Line 21 VBI captioning is indeed the standard for standard definition, baseband digital and analog video. It's also and the standard for some interchange formats like D10 / IMX, both of which use MPEG-2's 4:2:2 profile to encode a 720x512 image for NTSC.
#7506closeddefect (fixed)
Reported by: | Owned by: | ||
---|---|---|---|
Priority: | normal | Component: | ffmpeg |
Version: | git-master | Keywords: | |
Cc: | Blocked By: | ||
Blocking: | Reproduced by developer: | no | |
Analyzed by developer: | no |
- Any chance you can also add the ability to insert captions (in EIA-608/708 form) as well? I'd like to be able to produce an mpeg2 ts which contains EIA-608/708 captions instead of having them burned into the video. FFMPEG didn't extract anything regardless of seeing the input track. Sample MOV available, but is 4.8GB and only 5mins long.
- Jan 09, 2020 The Future of CEA-608 vs. CEA-708 Closed Captions. While CEA-608 captions still appear on digital television, it is clear that the standards are moving away from this outdated format. 608 captions are not compliant with most of the FCC’s recent rules and standards and have little place in broadcast programming moving forward.
- This is only for extracting EIA-607/708 captions from the input, correct? Any chance you can also add the ability to insert captions (in EIA-608/708 form) as well? I'd like to be able to produce an mpeg2 ts which contains EIA-608/708 captions instead of having them burned into the video.
Description
Attachments (4)
- sample-1min-stderr.log (411.4 KB) - added by w_boba23 months ago.
- FFmpeg debug log
- sample-1min-ts.srt (2.9 KB) - added by w_boba23 months ago.
- CCs from original file
- sample-1min-mp4.srt (2.9 KB) - added by w_boba23 months ago.
- CCs from output file
- sample-1min-patched.srt (2.9 KB) - added by w_boba22 months ago.
- SRT file extracted from output MP4 file after patch was applied
Download all attachments as: .zip
Change History (15)
Changed 23 months ago by w_boba
- Attachmentsample-1min-stderr.log added
Changed 23 months ago by w_boba
- Attachmentsample-1min-ts.srt added
![Extract Eia 608 Captions Ffmpeg Extract Eia 608 Captions Ffmpeg](https://i.imgur.com/JJavDFQ.png)
Changed 23 months ago by w_boba
- Attachmentsample-1min-mp4.srt added
comment:2 Changed 23 months ago by The_Bart_The
comment:4follow-up:↓ 5 Changed 22 months ago by cehoyos
comment:5 in reply to: ↑ 4 Changed 22 months ago by w_boba
Changed 22 months ago by w_boba
- Attachmentsample-1min-patched.srt added
Extract Eia 608 Captions Ffmpeg Free
comment:6 Changed 22 months ago by w_boba
Last edited 22 months ago by w_boba (previous) (diff)
comment:7follow-up:↓ 8 Changed 22 months ago by cehoyos
- Component changed from undetermined to ffmpeg
- Keywordsccfps added; EIA-608a53ccclosedcaptions removed
comment:8 in reply to: ↑ 7 Changed 22 months ago by w_boba
comment:9 Changed 22 months ago by cehoyos
- Resolution set to fixed
- Status changed from new to closed
comment:10 Changed 20 months ago by w_boba
- Resolutionfixed deleted
- Status changed from closed to reopened
comment:11 Changed 20 months ago by cehoyos
Extract Eia 608 Captions Ffmpeg Download
![Extract Extract](https://www.nypl.org/sites/default/files/openav3.png)
Extract Eia 608 Captions Ffmpeg Online
- Resolution set to fixed
- Status changed from reopened to closed