[FFmpeg-trac] #5876(avfilter:new): vf_fps outputs extraneous frame

[FFmpeg]

#5876: vf_fps outputs extraneous frame
----------------------------------+--------------------------------------
             Reporter:  Illya     |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avfilter  |                  Version:  git-master
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 Summary of the bug:
 60fps.mp4 has 900 frames
 out.avi has 451 frames, it should have 450

 How to reproduce:
 {{{
 $ ~/Workspace/Multimedia/ffmpeg/ffmpeg/ffmpeg -i 60fps.mp4 -vf fps=30
 out.avi
 ffmpeg version N-81883-gbeb877b Copyright (c) 2000-2016 the FFmpeg
 developers
   built with Apple LLVM version 8.0.0 (clang-800.0.38)
   configuration: --samples=fate
   libavutil      55. 32.100 / 55. 32.100
   libavcodec     57. 60.101 / 57. 60.101
   libavformat    57. 51.102 / 57. 51.102
   libavdevice    57.  0.102 / 57.  0.102
   libavfilter     6. 63.100 /  6. 63.100
   libswscale      4.  1.100 /  4.  1.100
   libswresample   2.  2.100 /  2.  2.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '60fps.mp4':
   Metadata:
     major_brand     : mp42
     minor_version   : 0
     compatible_brands: mp42mp41isomavc1
     creation_time   : 2016-10-03T21:26:33.000000Z
   Duration: 00:00:15.04, start: 0.000000, bitrate: 4115 kb/s
     Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv,
 bt709), 1280x720 [SAR 1:1 DAR 16:9], 3861 kb/s, 60 fps, 60 tbr, 60 tbn,
 120 tbc (default)
     Metadata:
       creation_time   : 2016-10-03T21:26:33.000000Z
       handler_name    : L-SMASH Video Handler
       encoder         : AVC Coding
     Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
 stereo, fltp, 256 kb/s (default)
     Metadata:
       creation_time   : 2016-10-03T21:26:33.000000Z
       handler_name    : L-SMASH Audio Handler
 File 'out.avi' already exists. Overwrite ? [y/N] y
 Output #0, avi, to 'out.avi':
   Metadata:
     major_brand     : mp42
     minor_version   : 0
     compatible_brands: mp42mp41isomavc1
     ISFT            : Lavf57.51.102
     Stream #0:0(und): Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1280x720
 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 30 fps, 30 tbn, 30 tbc (default)
     Metadata:
       creation_time   : 2016-10-03T21:26:33.000000Z
       handler_name    : L-SMASH Video Handler
       encoder         : Lavc57.60.101 mpeg4
     Side data:
       cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
     Stream #0:1(und): Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo,
 fltp, 192 kb/s (default)
     Metadata:
       creation_time   : 2016-10-03T21:26:33.000000Z
       handler_name    : L-SMASH Audio Handler
       encoder         : Lavc57.60.101 ac3
 Stream mapping:
   Stream #0:0 -> #0:0 (h264 (native) -> mpeg4 (native))
   Stream #0:1 -> #0:1 (aac (native) -> ac3 (native))
 Press [q] to stop, [?] for help
 frame=  451 fps=149 q=31.0 Lsize=    4749kB time=00:00:15.04
 bitrate=2586.7kbits/s speed=4.98x
 video:4365kB audio:352kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.669291%
 }}}
 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5876>
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