[FFmpeg-trac] #1639(avfilter:new): concat filter frozen

[FFmpeg]

#1639: concat filter frozen
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             Reporter:  chinshou  |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avfilter  |                  Version:  unspecified
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 The concat filter cause ffmpeg frozen.

 prepare any mp4 video , rename it to 1.mp4. then copy it to 2.mp4.

 finally execute following command to join the two videos

 ffmpeg -f lavfi -i "movie=1.mp4, scale=512:288 [v1] ; amovie=1.mp4 [a1]
 ;movie=2.mp4, scale=512:288 [v2] ; amovie=2.mp4 [a2] ;[v1] [v2] concat
 [out0] ; [a1] [a2] concat=v=0:a=1 [out1]" join.avi

 ffmpeg begin to encoding successfully , but frozen at 50% .

 I used the ffmpeg 20120810 windows build from
 http://ffmpeg.zeranoe.com/builds/win32/static/ffmpeg-20120810-git-633b90c-
 win32-static.7z

 I investigate the code and found the frozen caused by av_read_frame , the
 call will be blocked at 50% position.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1639>
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