[FFmpeg-trac] #8598(undetermined:new): Drawtext displays incorrect timecode

FFmpeg trac at avcodec.org
Thu Apr 2 16:14:48 EEST 2020


#8598: Drawtext displays incorrect timecode
-------------------------------------+-------------------------------------
             Reporter:  aalexgabi    |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  drawtext,    |               Blocked By:
  timecode                           |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 Drawtext with timecode option writes incorrect second number for a given
 frame.
 How to reproduce:
 {{{
 ffmpeg -filter_complex
 "testsrc=size=200x100:r=1000/70[testsrc];[testsrc]drawtext=timecode='00\:00\:00\:00':r=1000/70:fontsize=32:y=4:x=4[timecode];sine=frequency=1000[audio]"
 -map '[timecode]' -map '[audio]' -pix_fmt yuv420p -t 3.5 -y testsrc-
 timecode-200x100 at 14.28-3.5s-sine.mp4

 ffmpeg -i testsrc-timecode-200x100 at 14.28-3.5s-sine.mp4 frame%04d.png
 }}}

 Frame 29 that is displayed between 1960ms and 2030ms has the timecode:
 00:00:02:00

 Documentation says vaguely that "value" (no idea what value it talks
 about) is rounded:
 {{{
 timecode_rate, rate, r
     Set the timecode frame rate (timecode only). Value will be rounded to
 nearest integer. Minimum value is "1". Drop-frame timecode is supported
 for frame rates 30 & 60.
 }}}

 Regardless of what the documentation says I think this is incorrect

 Version:
 {{{
 % ffmpeg -version
 ffmpeg version n4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
 built with gcc 9.2.1 (Arch Linux 9.2.1+20200130-2) 20200130
 configuration: --prefix=/usr --disable-debug --disable-static --disable-
 stripping --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl
 --enable-ladspa --enable-libaom --enable-libass --enable-libbluray
 --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi
 --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx
 --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb
 --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-
 libpulse --enable-libsoxr --enable-libspeex --enable-libssh --enable-
 libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis
 --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265
 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-nvdec --enable-
 nvenc --enable-omx --enable-shared --enable-version3
 libavutil      56. 31.100 / 56. 31.100
 libavcodec     58. 54.100 / 58. 54.100
 libavformat    58. 29.100 / 58. 29.100
 libavdevice    58.  8.100 / 58.  8.100
 libavfilter     7. 57.100 /  7. 57.100
 libswscale      5.  5.100 /  5.  5.100
 libswresample   3.  5.100 /  3.  5.100
 libpostproc    55.  5.100 / 55.  5.100
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8598>
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