[FFmpeg-trac] #3419(avformat:new): -ss on the input has no effect when extracting subtitles

[FFmpeg]

#3419: -ss on the input has no effect when extracting subtitles
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             Reporter:  bubbleguuum   |                     Type:  defect
               Status:  new           |                 Priority:  normal
            Component:  avformat      |                  Version:  2.1.3
             Keywords:  srt, subitle  |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
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 uUing the -ss option to specify the start of the input has no effect when
 extracting subtitles. The full subtitle extracted, not taking into account
 the start position:


 {{{
 % ffmpeg  -i
 h264_720p_hp_5.1_3mbps_vorbis_styled_and_unstyled_subs_suzumiya.mkv -map
 0:2 -c:0 srt -f srt sub1.srt

 % ffmpeg -ss 10 -i
 h264_720p_hp_5.1_3mbps_vorbis_styled_and_unstyled_subs_suzumiya.mkv -map
 0:2 -c:0 srt -f srt sub2.srt
 }}}

 both files sub1.srt and sub2.srt are identical.
 I would have expected sub2.srt timestamps to be offset by -10 seconds, and
 all cues < 10s to be discarded.

 The file used for testing can be found here:
 http://www.auby.no/files/video_tests/h264_720p_hp_5.1_3mbps_vorbis_styled_and_unstyled_subs_suzumiya.mkv

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Ticket URL: <https://trac.ffmpeg.org/ticket/3419>
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