[FFmpeg-trac] #3808(avformat:new): Seeking in flv with video stream disabled fails

[FFmpeg]

#3808: Seeking in flv with video stream disabled fails
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             Reporter:  gjdfgh    |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avformat  |                  Version:  unspecified
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 Seeking in flv with video stream disabled (i.e. st->discard =
 AVDISCARD_ALL) does not work. The seek call apparently succeeds, but after
 that no packets can be read. The same works if the video stream is
 enabled.

 I couldn't reproduce this with the ffmpeg command line utility. I suspect
 it's because "-ss" seeks the file _before_ the unneeded streams are
 disabled.

 Sample: youtube-dl http://www.arte.tv/guide/de/049446-000/das-buch-der-
 madrigale

 (Probably any flv file does it.)

 I tested with a recent git head, but I know that the problem probably
 existed for ages.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3808>
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