[FFmpeg-trac] #2830(avformat:new): stronger ff_index_search_timestamp

[FFmpeg]

#2830: stronger ff_index_search_timestamp
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             Reporter:  zgw860714  |                     Type:  defect
               Status:  new        |                 Priority:  normal
            Component:  avformat   |                  Version:  unspecified
             Keywords:  seek       |               Blocked By:
             Blocking:             |  Reproduced by developer:  1
Analyzed by developer:  1          |
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 The end of ff_index_search_timestamp will search the AVINDEX_KEYFRAME。when
 several frames from beginning is not keyframe and flags is
 AVSEEK_FLAG_BACKWARD, the function maybe return -1.leading the
 av_seek_file to fail.when i want seek the first frame or
 play from stop,the stream will not seek
 to the beginning.
 I suggest fix the bug.Before return,if m is -1 and flags is BACKWARD, set
 m to be 0.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2830>
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