[FFmpeg-trac] #6664(undetermined:new): ffmpeg concat audio not in sync

[FFmpeg]

#6664: ffmpeg concat audio not in sync
-------------------------------------+-------------------------------------
             Reporter:  tcwebadmin   |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  concat,      |               Blocked By:
  ffmpeg                             |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug: when using concat in 3.3.4 the audio is out of sync.
 How to reproduce:
 {{{
 % ffmpeg -threads 0 -f concat -safe 0 -i /tmp/files.txt -vf
 "scale=iw*min(560/iw\,320/ih):ih*min(560/iw\,320/ih),
 pad=560:320:(560-iw*min(560/iw\,320/ih))/2:(320-ih*min(560/iw\,320/ih))/2"
 -preset veryslow -crf 15 -acodec libmp3lame -af aresample=resampler=soxr
 -ar 44100 -aspect 16:9 -async 1 -qp 20 -pix_fmt yuv420p -framerate 30 -ab
 128k -ac 1 -vcodec libx264 -max_muxing_queue_size 9999 -movflags
 +faststart /tmp/final_output_video.mp4 -y
 ffmpeg version 3.3.4
 built on CentOS
 }}}

 Please refer to https://stackoverflow.com/questions/45969083/ffmpeg-
 concat-with-video-using-image-background for complete description of bug.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6664>
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