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• FFmpeg for marking time video based on a reference date

  3 août 2016, par Denio Mariz

  I am trying to mark a timestamp in a video using Drawtext filter.
  FFmpeg easily marks timestamps based on localtime, gmtime or even PTS. However, I want to assign a reference time (start time) for the timestamp in order to represent the time the video was recorded (not encoded).

  Reading the documentation, I found that option "basetime" can be used for this purpose. However it seems that is not working or I am missing something.

  The command line I am using is :

  ffmpeg -y -i input.mp4 -filter_complex drawtext="fontfile=/tmp/UbuntuMono-B.ttf: fontsize=36: fontcolor=yellow: box=1: boxcolor=black@0.4: text='Wall Clock Time\: %{gmtime\:%Y-%m-%d %T}': basetime=1456007118" output.mp4

  By using basetime=1456007118", it was expected the start time was set to ’02/20/2016 20:25:18’ since 1456007118 is the UTC time for that time and date :

  date -d '02/20/2016 20:25:18' +"%s" # format MM/DD/AAAA hh:mm:ss
  
  1456007118

  However, no error is issued by FFMpeg and the video is marked with current GMT, ignoring "basetime" option.

  Any hint ?
  Thanks.

  Complete information about FFmpeg version and output is :

     ffmpeg -y -i /home/denio/Videos/Interstellar_2014_Trailer_4_5.1-1080p-HDTN.mp4 -filter_complex drawtext="fontfile=/tmp/UbuntuMono-B.ttf: fontsize=36: fontcolor=yellow: box=1: boxcolor=black@0.4: text='Wall Clock Time\: %{gmtime\:%Y-%m-%d %T}': basetime=1470226363" /tmp/x.mp4
   ffmpeg version 3.1.1 Copyright (c) 2000-2016 the FFmpeg developers
     built with gcc 5.3.1 (Ubuntu 5.3.1-14ubuntu2.1) 20160413
     configuration: --enable-libxavs --enable-bzlib --enable-libfaac --enable-libfreetype --enable-libfontconfig --enable-libmp3lame --enable-libschroedinger --enable-libspeex --enable-libvorbis --enable-libx264 --enable-libx265 --enable-libxvid --enable-zlib --enable-x11grab --enable-static --enable-pthreads --enable-gpl --enable-nonfree --enable-version3 --disable-ffserver --enable-libgsm --enable-librtmp --enable-libvpx --enable-libschroedinger --enable-libopencore-amrnb --enable-libopenjpeg
     libavutil      55. 28.100 / 55. 28.100
     libavcodec     57. 48.101 / 57. 48.101
     libavformat    57. 41.100 / 57. 41.100
     libavdevice    57.  0.101 / 57.  0.101
     libavfilter     6. 47.100 /  6. 47.100
     libswscale      4.  1.100 /  4.  1.100
     libswresample   2.  1.100 /  2.  1.100
     libpostproc    54.  0.100 / 54.  0.100
   ...
   ...

• avformat/oggdec : Fix integer overflow with invalid pts

  3 août 2016, par Michael Niedermayer

  avformat/oggdec : Fix integer overflow with invalid pts
  If negative pts are possible for some codecs in ogg then the code needs to be
  
  changed to use signed values.
  Found-by : Thomas Guilbert <tguilbert@google.com>
  
  Fixes : clusterfuzz_usan-2016-08-02
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/oggdec.h

• libavcodec/dnxhd : Enable 12-bit DNxHR support.

  2 août 2016, par Steven Robertson

  libavcodec/dnxhd : Enable 12-bit DNxHR support.
  10- and 12-bit DNxHR use the same DC coefficient decoding process and
  
  VLC table, just with a different shift value. From SMPTE 2019-1:2016,
  
  8.2.4 DC Coefficient Decoding :
  "For 8-bit video sampling, the maximum value of η=11 and for
  
  10-/12-bit video sampling, the maximum value of η=13."
  A sample file will be uploaded to show that with this patch, things
  
  decode correctly :
  
  dnxhr_hqx_12bit_1080p_smpte_colorbars_davinci_resolve.mov
  Signed-off-by : Steven Robertson <steven@strobe.cc>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/dnxhddec.c