[FFmpeg-trac] #7361(avfilter:new): fps filter can drop only frame

[FFmpeg]

#7361: fps filter can drop only frame
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  important  |              Component:  avfilter
                Version:  git-       |               Keywords:  fps
  master                             |  regression
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 http://ffmpeg.org/pipermail/ffmpeg-user/2018-August/040928.html
 A user provided a multimedia file containing only one video frame (but
 sound). The fps filter currently drops a single frame in a video stream
 since eea64ef4cfb593cbe28465f45e6bd4c41a79cae1, related to ticket #2674.
 {{{
 $ ffmpeg -i video_only_1frame.mp4 -vf fps=1 out.mov
 ffmpeg version N-91626-gf631c32 Copyright (c) 2000-2018 the FFmpeg
 developers
   built with gcc 6.4.0 (GCC)
   configuration: --enable-gpl --enable-gnutls --enable-libxml2
   libavutil      56. 19.100 / 56. 19.100
   libavcodec     58. 23.100 / 58. 23.100
   libavformat    58. 17.101 / 58. 17.101
   libavdevice    58.  4.101 / 58.  4.101
   libavfilter     7. 26.100 /  7. 26.100
   libswscale      5.  2.100 /  5.  2.100
   libswresample   3.  2.100 /  3.  2.100
   libpostproc    55.  2.100 / 55.  2.100
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x2cb3600] decoding for stream 0 failed
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video_only_1frame.mp4':
   Metadata:
     major_brand     : mp42
     minor_version   : 0
     compatible_brands: isommp42
     creation_time   : 2015-10-03T12:28:39.000000Z
   Duration: 00:00:01.24, start: 0.000000, bitrate: 5762 kb/s
     Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
 1920x1080, SAR 1:1 DAR 16:9, 90k tbn, 180k tbc (default)
     Metadata:
       rotate          : 90
       creation_time   : 2015-10-03T12:28:39.000000Z
       handler_name    : VideoHandle
     Side data:
       displaymatrix: rotation of -90.00 degrees
     Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
 stereo, fltp, 152 kb/s (default)
     Metadata:
       creation_time   : 2015-10-03T12:28:39.000000Z
       handler_name    : SoundHandle
 Stream mapping:
   Stream #0:0 -> #0:0 (h264 (native) -> mpeg4 (native))
   Stream #0:1 -> #0:1 (aac (native) -> aac (native))
 Press [q] to stop, [?] for help
 Output #0, mov, to 'out.mov':
   Metadata:
     major_brand     : mp42
     minor_version   : 0
     compatible_brands: isommp42
     encoder         : Lavf58.17.101
     Stream #0:0(eng): Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 1080x1920
 [SAR 1:1 DAR 9:16], q=2-31, 200 kb/s, 1 fps, 16384 tbn, 1 tbc (default)
     Metadata:
       encoder         : Lavc58.23.100 mpeg4
       creation_time   : 2015-10-03T12:28:39.000000Z
       handler_name    : VideoHandle
     Side data:
       cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
       displaymatrix: rotation of -0.00 degrees
     Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
 stereo, fltp, 128 kb/s (default)
     Metadata:
       creation_time   : 2015-10-03T12:28:39.000000Z
       handler_name    : SoundHandle
       encoder         : Lavc58.23.100 aac
 frame=    0 fps=0.0 q=0.0 Lsize=      13kB time=00:00:01.29 bitrate=
 78.9kbits/s speed=43.2x
 video:0kB audio:11kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 9.397406%
 [aac @ 0x2cc0100] Qavg: 39785.051
 }}}
 The frame is dropped no matter the value for fps.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7361>
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