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• lavc/packet : add API for an AVPacket-based AVContainerFifo

  11 décembre 2024, par Anton Khirnov

  lavc/packet : add API for an AVPacket-based AVContainerFifo
  

  • [DH] doc/APIchanges
  • [DH] libavcodec/packet.c
  • [DH] libavcodec/packet.h
  • [DH] libavcodec/version.h

• FFmpeg for marking time video based on a reference date

  29 décembre 2018, 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
  
  ...
  
  ...

• FFMPEG : Create timestamp based on actual creation time

  2 juillet 2022, par Peder Wessel

  Desired outcome

  


  Add overlay with timestamp for each frame of a video based on the original creation time for the video. E.g. starting at 2022-03-26T15:51:49.000000Z and a second later in the video present 2022-03-26T15:51.50.000000Z

  


  Approach

  


  Creation_time stored in the file already, e.g. when running ffmpeg -i input.mov" it presents creation_time   : 2022-03-26T15:51:49.000000Z.

  


  Adding overlay with timestamp to video :
ffmpeg -i input.mov -filter_complex "drawtext=text='%{pts\:gmtime\:1507046400\:%d-%m-%Y %T}': x=100 : y=100: box=1" -c:a copy output.mp4

  


  Challenge/ help needed

  


  Need to replace the gmtime\:1507046400 with the actual creation_time. How does one do it ?

  


  Sources

  


  

  • Overlay : https://superuser.com/questions/1013753/how-can-i-overlay-the-captured-timestamp-onto-a-video-using-ffmpeg-in-yyyy-mm-dd

  


  • Creation_time :
FFMPEG - Get creation and/or modification date