[FFmpeg-trac] #4870(undetermined:new): framerate filter duplicates last frame when converting 25 to 24 fps

[FFmpeg]

#4870: framerate filter duplicates last frame when converting 25 to 24 fps
-------------------------------------+-------------------------------------
             Reporter:  rmk          |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Execute the command line below and look at the last two frames of the
 output and its duration (is one frame too many, because it should be 1s as
 the input (24 frames width duration 1/24)).

 Command line (adjust the font file path for your os) and output:

 {{{
 ffmpeg -f lavfi -i testsrc=640x480:d=1:r=25 -vcodec mpeg4 -vf
 drawtext="fontfile=/System/Library/Fonts/Courier.dfont:text='Frame
 %{n}':x=85:y=H/2+lh/2+descent-
 ascent:fontsize=48:fontcolor=black",framerate=fps=24 -q:v 1 -y
 25_to_24_1s.mov
 ffmpeg version git-2015-09-15-f6ef8f2 Copyright (c) 2000-2015 the FFmpeg
 developers
   built with Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM
 3.5svn)
   configuration: --enable-shared --disable-static --disable-doc --disable-
 devices --enable-indev=lavfi
 --prefix=/Users/teamcity/buildAgent/work/3b1b1b1b725f407e/build/ffmpeg
 --extra-
 cflags=-I/Users/teamcity/buildAgent/work/3b1b1b1b725f407e/build/libmp3lame/include/
 --extra-
 ldflags=-L/Users/teamcity/buildAgent/work/3b1b1b1b725f407e/build/libmp3lame/lib/
 --extra-ldflags='-Wl,-rpath, at loader_path/../lib' --enable-libmp3lame
 --enable-libopenh264 --enable-libfreetype
   libavutil      55.  2.100 / 55.  2.100
   libavcodec     57.  1.100 / 57.  1.100
   libavformat    57.  0.100 / 57.  0.100
   libavdevice    57.  0.100 / 57.  0.100
   libavfilter     6.  3.100 /  6.  3.100
   libswscale      4.  0.100 /  4.  0.100
   libswresample   2.  0.100 /  2.  0.100
 Input #0, lavfi, from 'testsrc=640x480:d=1:r=25':
   Duration: N/A, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 640x480
 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
 [Parsed_framerate_1 @ 0x101f03640] time base:1/25 -> 1/600 exact:1
 [Parsed_framerate_1 @ 0x101f03640] fps -> fps:24/1 scene score:7.000000
 interpolate start:15 end:240
 Output #0, mov, to '25_to_24_1s.mov':
   Metadata:
     encoder         : Lavf57.0.100
     Stream #0:0: Video: mpeg4 (mp4v / 0x7634706D), yuv420p, 640x480 [SAR
 1:1 DAR 4:3], q=2-31, 200 kb/s, 24 fps, 12288 tbn, 24 tbc
     Metadata:
       encoder         : Lavc57.1.100 mpeg4
 Stream mapping:
   Stream #0:0 -> #0:0 (rawvideo (native) -> mpeg4 (native))
 Press [q] to stop, [?] for help
 frame=   25 fps=0.0 q=1.0 Lsize=     100kB time=00:00:01.04 bitrate=
 787.9kbits/s
 video:99kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.922774%
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/4870>
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