[FFmpeg-devel] ogg kate text subtitles support (patch)

Clément Bœsch u at pkh.me
Mon Oct 24 12:49:25 EEST 2016

On Mon, Oct 24, 2016 at 11:46:07AM +0200, Clément Bœsch wrote:
> On Mon, Oct 24, 2016 at 11:39:40AM +0200, u-9iep at aetey.se wrote:
> > On Mon, Oct 24, 2016 at 11:09:43AM +0200, wm4 wrote:
> > > > Text subtitles in ogg kate are a straightforward way to put srt-like data
> > > 
> > > Note that srt supports simple HTML-like tags.
> > 
> > Yes, you are right, the patch just ignores the possible presence
> > of Kate markup (does not try to interpret it, nor removes).
> > This is probably not too bad, for the minimal support.
> > 
> It is bad if you don't strip the markup in the decoder.

To expand on this: it is extremely worrisome that ffmpeg could be the
source of yet another wave of insane .srt files with kate markup in it
because someone decided to run ffmpeg -i in.ogg out.srt in order to
extract the subtitles and share them.

You absolutely want to strip all markup in the decoder for minimal
support, or FFmpeg will generate broken files, which is not tolerable.

Clément B.

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