[FFmpeg-devel] Format of decoded text subtitles

[Nicolas George]

Le quintidi 15 thermidor, an CCXX, Clément Bœsch a écrit :
> I think that markup can be left unchanged to start with: no changes
> required in the decoders. And I also think we should follow Michael's
> recommendation about just extending the ASS markup to FFmpeg needs

If you really think it is better. What about simplifying markup: {\a2\fs25}
-> {\a2}{\fs25}? It may make work easier for non-ASS encoders.

> only one "important" I see in the pure markup thing is text justification;
> I don't think ASS has that). I'd propose to wait for the AS6
> specifications (ASS++) to see if we can't just follow it.

Do you know when it is due?

> I guess you'll hit some classic storage issues, such as how to make a sane
> key/value system for palettes for example. I can't think of much more
> things.

What do you mean exactly?


I realized that this proposal has an easy solution for transition: since
currently a lot of decoders fill the rect->ass field with a full ASS event
line, converting old encoders to the new format can be done in the wrapper
function:

	if (rect->ass && !rect->rich_text) {
	    av_log(avc, AV_LOG_WARNING, "Please update the decoder\n");
	    ff_convert_legacy_ass(rect);
	}

Regards,

-- 
  Nicolas George
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 198 bytes
Desc: Digital signature
URL: <http://ffmpeg.org/pipermail/ffmpeg-devel/attachments/20120802/0b8d2a9f/attachment.asc>