[FFmpeg-devel] Captions SCC

[Devlist Archive]

I have had some work done on captions over on CasparCG, and the dev there
has informed me that Softworkz's Subtitle Filtering or something like it is
a framework that would make solving the embed/extract problem easier for
sidecar and mxf files.  The whole set of terminology practice used in this
project of referring to captions as a type of subtitle has been a bit
confusing to me, as I see them as separate data types.  I am sorry that has
made it hard to evaluate the various proposed solutions.  What progress
needs to be made for Subtitle Filtering, or something like it to  be ready
to merge?  What are the specific areas that need updated or cleaned up to
allow that to happen?  Let's please give specific references to parts of
code instead of talking in generality about the patchset unless there are
structural changes required.  I know there is a history here that I am not
fully  briefed on, but some structural change like subtitle filtering is
needed to solve the broken state of captions support in ffmpeg.

Zach

On Sun, Feb 9, 2025 at 6:55 PM Devlist Archive <devlist at rlb.org> wrote:

> I believe I have sorted out the embed/extract issues I encountered into a
> formatting issue with the .scc file and lack of eia-608 codec for embedding
> captions.  It is possible this might be a result of an oversight regarding
> drop frame or non drop frame time codes with some part of the chain that
> handles extracted captions data.  Please discuss the best way to solve
> these issues in the appropriate locations.  Once a solution is identified
> let me know if I need to go find sponsorship funds to expedite generating
> the appropriate patches.
>
> https://trac.ffmpeg.org/ticket/11461
>
> https://trac.ffmpeg.org/ticket/11462
>
> On Sun, Feb 9, 2025 at 12:34 PM Soft Works <
> softworkz-at-hotmail.com at ffmpeg.org> wrote:
>
>>
>>
>> > -----Original Message-----
>> > From: ffmpeg-devel <ffmpeg-devel-bounces at ffmpeg.org> On Behalf Of
>> > Marth64
>> > Sent: Sunday, February 9, 2025 9:23 PM
>> > To: FFmpeg development discussions and patches <ffmpeg-
>> > devel at ffmpeg.org>
>> > Subject: Re: [FFmpeg-devel] Captions SCC
>> >
>> > On Sun, Feb 9, 2025 at 2:14 PM Soft Works
>> > <softworkz-at-hotmail.com at ffmpeg.org> wrote:
>> > > Numpad alignment 7, LeftMargin=x VertMargin=y
>> >
>> > Yeah, that could work. I forgot about margins. I'll play around with
>> > it.
>>
>> That's the elementary way to position ASS text.
>> Years ago I had a chat with one the libass developers because I didn't
>> want to believe it and thought there must be something else.. 😊
>>
>> sw
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>