[FFmpeg-devel] [RFC PATCH 0/5] Properly handle CEA-708 caption data when transcoding

[Devin Heitmueller]

On Fri, Mar 17, 2023 at 7:23 PM BUCCIANTINI Francesco - ADECCO
<francesco.bucciantini.adecco at skytv.it> wrote:
>
> This is indeed very welcome.
> Being able to re-encode from 25i to 50p while preserving subtitles has been something I've been trying to do for a while, so seeing this patch for CEA-708 is definitely a nice thing.
>
> I have a question, though: will something similar be done for OP-47 subtitles too?
> Currently they suffer the same issue when a re-encode changes the frame rate... :(

I don't have any plans to work on OP-47, and I'm not sure if anyone
else does.  While I've done a bit of work with it in the SDI domain,
I'm not super familiar with how it's treated by ffmpeg, or whether a
similar approach is appropriate for dealing with it.  I can say that
the FIFO here is highly specific to the CEA-708 standard, as we have
to disassemble and reassemble the payloads to meet the specification
(i.e. not applicable to OP-47).

Devin

-- 
Devin Heitmueller, Senior Software Engineer
LTN Global Communications
o: +1 (301) 363-1001
w: https://ltnglobal.com  e: devin.heitmueller at ltnglobal.com