[FFmpeg-trac] #4041(undetermined:new): ffmpeg copy ts to mp4, fps was changed

[FFmpeg]

#4041: ffmpeg copy ts to mp4, fps was changed
-------------------------------------+-------------------------------------
             Reporter:  qianliang    |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:  fps          |               Blocked By:
  metadata                           |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 How to reproduce:
 {{{
 % ffmpeg -i input.ts -c copy output.mp4
 Input #0, mpegts, from 'input.ts':
   Duration: 00:00:59.43, start: 62.100000, bitrate: 1623 kb/s
   Program 1
     Metadata:
       service_name    : Service01
       service_provider: FFmpeg
     Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B),
 yuv420p, 640x480, 20 fps, 40 tbr, 90k tbn, 40 tbc
 Output #0, mp4, to 'output.mp4':
   Metadata:
     encoder         : Lavf56.9.100
     Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 640x480,
 q=2-31, 20 fps, 90k tbn, 90k tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
 Press [q] to stop, [?] for help
 frame= 1488 fps=0.0 q=-1.0 Lsize=   10781kB time=00:00:59.40
 bitrate=1486.9kbits/s
 video:10767kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.128117%
 ffmpeg version
 ffmpeg version N-66797-gb8a5599
 built on http://ffmpeg.zeranoe.com/builds/
 }}}

 It shows output.mp4 with 20 fps. But
 {{{
 % ffmpeg -i output.mp4
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2avc1mp41
     encoder         : Lavf56.9.100
   Duration: 00:00:59.45, start: 0.000000, bitrate: 1485 kb/s
     Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
 640x480, 1483 kb/s, 25.03 fps, 40 tbr, 90k tbn, 4
 0 tbc (default)
     Metadata:
       handler_name    : VideoHandler
 }}}

 The fps changed to 25.03 fps

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Ticket URL: <https://trac.ffmpeg.org/ticket/4041>
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