[FFmpeg-trac] #7362(avcodec:new): Newline in subtitles: sub.ass - CRLF and sub.srt - LF

[FFmpeg]

#7362: Newline in subtitles: sub.ass - CRLF and sub.srt - LF
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             Reporter:  KnightDanila  |                    Owner:
                 Type:  enhancement   |                   Status:  new
             Priority:  wish          |                Component:  avcodec
              Version:  git-master    |               Resolution:
             Keywords:  ass srt       |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
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Comment (by beroal):

 Replying to [comment:1 cehoyos]:
 > Replying to [ticket:7362 KnightDanila]:
 > > Picture 1 - sub.ass has CRLF newline style
 > > Picture 2 - sub.srt has LF newline style
 >
 > Why do you believe that one of them is wrong?
 > > Can you add option -eol to choose the newline style
 >
 > Wouldn’t such an option allow to write invalid files?

 I recently extracted text subtitles from "mkv" on Linux, and the result
 has a mix of "\r\n" and "\n" line ends which is clearly incorrect. So
 "ffmpeg" *already* produced an incorrect file, see below.

 {{{
 0000000    1  \n   0   0   :   0   0   :   0   1   ,   4   4   3       -
 0000010    -   >       0   0   :   0   0   :   0   4   ,   5   3   6  \n
 0000020                                  342 231 252       M   e   e   t
 0000030        R   e   b   e   c   c   a     342 231 252  \n  \n   2  \n
 0000040    0   0   :   0   0   :   0   4   ,   5   4   7       -   -   >
 0000050        0   0   :   0   0   :   0   7   ,   3   3   0  \n
 0000060          342 231 252       S   h   e   '   s       t   h   e
 0000070    c   o   o   l   e   s   t       g   i   r   l  \r  \n
 0000080                    i   n       t   h   e       w   o   r   l   d
 0000090    ,       w   a   i   t     342 231 252  \n  \n   3  \n   0   0
 00000a0    :   0   0   :   0   7   ,   4   0   7       -   -   >       0
 00000b0    0   :   0   0   :   1   0   ,   5   4   2  \n
 }}}

 IMHO, there is no need for an option because, according to
 http://www.textfiles.com/uploads/kds-srt.txt , lines must end with "\r\n".
 So "ffmpeg" must produce "\r\n" for all line ends on all operating
 systems.

 On the other hand, an option for adding UTF-8 byte order mark would be
 useful as some rare programs ("dsrt", for example) require it in UTF-8
 text files.

 I see that "\r\n" are used between lines of a single subtitle record. I do
 not know how text subtitles are stored in "mkv", but I guess that a text
 of a subtitle record in the input file uses "\r\n" to separate lines, and
 "ffmpeg" inserts "\n" after timing and subtitle record numbers because my
 operating system is Linux.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7362#comment:3>
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