[FFmpeg-devel] [PATCH] movtextdec: fix handling of UTF-8 subtitles
jeebjp at gmail.com
Sat Mar 24 18:27:33 EET 2018
On Sat, Mar 24, 2018 at 6:05 PM, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
> Could you confirm that this is also what QT does?
> Or is it impossible that the patch breaks something?
Everything can in theory break something. Anyways, it was widely
understood that 3GPP timed text was a better defined MOV timed text,
but I did have a quick look at Apple's qtff.pdf, which happily enough
actually defined the start and end characters (yes, they are marked as
"characters") as follows from the "Subtitle Style Atom" definition
A 16-bit value that is the offset of the first character that is
to use the style specified in this record.
Zero (0) is the first character in the subtitle.
A 16-bit value that is the offset of the character that follows
the last character to use this style.
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