Re: [FFmpeg-devel] [PATCH v4 2/4] avcodec/{ass, webvttdec}: fix handling of backslashes

From: Oneric <oneric@oneric.de>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH v4 2/4] avcodec/{ass, webvttdec}: fix handling of backslashes
Date: Thu, 4 Apr 2024 20:36:50 +0200
Message-ID: <Zg7zQhLokd0CDDev@oneric.de> (raw)
In-Reply-To: <CA+28BfCyxL7UVLQD36miPGfVaCsHuzxCuYFJDHjKAHhsVZ9+yA@mail.gmail.com>

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On Thu, Apr 04, 2024 at 13:26:55 -0500, Marth64 wrote:
> >  Is \N a special sequence in ASS-speak
> \N is the special line break sequence in ASS
> 
> I’m not sure of other special sequences following the \ character, I yield
> to Oneric on this question.

Standard ASS(2) and SSAv4 have
  \N (forced linebreak)
  \n (linebreak hint)
  \h (nonbreaking space)

libass further has \{ and \} dealt with by the following commit.
Afaik no ASS renderer ever supported \\.

The added escaping happens for non-ASS format (in which those sequences
are just normal text) which get encoded into ASS by ffmpeg. If it weren’t
escaped we’d get sudden linebreaks, spaces etc and missing text.
It doesn’t affect ASS->ASS remuxing.

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