[FFmpeg-trac] #2067(avfilter:open): Support subtitles in libavfilter so seek is honored for subtitles filters (like hardsubbing)

[FFmpeg]

#2067: Support subtitles in libavfilter so seek is honored for subtitles filters
(like hardsubbing)
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             Reporter:  nikov        |                    Owner:
                 Type:  enhancement  |                   Status:  open
             Priority:  normal       |                Component:  avfilter
              Version:  unspecified  |               Resolution:
             Keywords:  sub seek     |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by ghospich):

 Ricky1252's workaround gave me some quality issues for some reason.
 This is another workaround for this issue.
 {{{
 ffmpeg -ss 102.042 -t 24.250 -i sintel-1024-surround.mp4 -c:v libvpx -vf
 scale=640:-1,setpts=PTS+102.042/TB,subtitles=sintel_en.srt,setpts=PTS-
 STARTPTS out.webm
 }}}

 Works nice for me, even in 2pass mode.

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Ticket URL: <https://trac.ffmpeg.org/ticket/2067#comment:15>
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