Re: [FFmpeg-devel] GSoC 2025 - OggKate subtitles support

From: Soft Works <softworkz-at-hotmail.com@ffmpeg.org>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] GSoC 2025 - OggKate subtitles support
Date: Tue, 4 Mar 2025 21:28:15 +0000
Message-ID: <DM8P223MB0365E9A446AB978EE0D9523FBAC82@DM8P223MB0365.NAMP223.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <886D6D93-99A7-490A-B871-EC50C8105EF1@gmail.com>

> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
> epirat07@gmail.com
> Sent: Dienstag, 4. März 2025 22:06
> To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
> Subject: Re: [FFmpeg-devel] GSoC 2025 - OggKate subtitles support
> 
> 
> 
> On 4 Mar 2025, at 20:44, Soft Works wrote:
> 
> >> -----Original Message-----
> >> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of
> >> Gianluca Cannata
> >> Sent: Dienstag, 4. März 2025 09:40
> >> To: ffmpeg-devel@ffmpeg.org
> >> Subject: [FFmpeg-devel] GSoC 2025 - OggKate subtitles support
> >>
> >> Good morning,
> >>
> >> I have to write a karaoke solution with FFmpeg libav libraries for a
> >> project of mine and I have found OggKate subtitles a good choice to
> >> implement such solution and I am thinking of writing a Kate demuxer
> and
> >> decoder along with a filter that will use OpenGL to render Kate
> >> subtitles
> >> capabilities on frame.
> >>
> >> What do you think ?
> >>
> >> There is someone interested in mentoring this proposal project ?
> >>
> >> Or is it too overkill ?
> >>
> >> Sincerely
> >>
> >> Gianluca
> >> _______________________________________________
> >
> >
> > Hi Gianluca,
> >
> > while it's true that "OggKate" doesn't appear to be well-known (I've
> never heard of it before), but it's also the only officially spec-ed
> subtitle format in Ogg containers (besides raw text).
> > I think that fact makes it interesting to implement it - one could
> also argue that the reason why it isn't widespread yet is that ffmpeg
> doesn't support it 😊
> >
> > The license of the reference implementation source code appears to be
> permissive (https://github.com/Distrotech/libkate?tab=License-1-ov-
> file#readme), so an adaption might be possible as well - yet, IANAL.
> 
> The official upstream repo for kate is here btw
> https://gitlab.xiph.org/xiph/kate

Thanks, I've been there but it was slow in loading, now I looked again and realized that there's new activity and new versions since Feb 2025 - after a 14 years break. That's a nice coincidence.
Weirdly it's the second resurrection I discovered today, there's also a new Aegisub version after 10 years of silence 😊

sw

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