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• Clarity on FFmpeg Filter graph description

  11 mars 2019, par Vencat

  I’m using libavfilter C API to scale my video.

  I started to read the documents related to libavfilter and got stuck at Filtergraph-description.

  I don’t understand the terminology "filter pads". Throughout the documents, I came across these terms like filter input pad and the output pad.

  It would be really appreciable if anyone explains the filter pads in a simple way. Also please share any documents or links related to libavfilter C API examples.

• How to put a text watermark on a video using ffmpeg command in android

  5 février 2016, par shivani

  I am trying to put watermark on the video file which i am compressing using ffmpeg library.

  What exactly is the command that i need to put to put a text watermark on the video file ??

  I have tried using this command :

  String commandStr = "ffmpeg -i " + inputpath
  
                      +" drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeSerif.ttf: text='Test Text' -strict experimental -s " + str_resolution
  
                      + " -ac 2 -ar 44100 -b "+str_bitrate+" "
  
                      + outvidpath;

  After using this command the video does not get generated. What could possibly could go wrong in this command ??

  Please help ! Thanks in advance !

• Libvpx unknown encoder with php exec

  5 juin 2016, par Justin Tullock

  I have centos7 with ffmpeg compiled with libvpx. I can run

  ffmpeg -i gif.gif -c:v libvpx -crf 12 -b:v 500K webm.webm

  which works perfectly but when I try the same command with php exec() it returns this :

  {array(16) { [0]=> string(66) "ffmpeg version 2.6.8 Copyright (c) 2000-2016 
  
  the FFmpeg developers" [1]=> string(55) " built with gcc 4.8.5 (GCC) 
  
  20150623 (Red Hat 4.8.5-4)" [2]=> string(1053) " configuration: --
  
  refix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --
  
  incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --
  
  arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -
  
  fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-
  
  switches -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-
  
  gnutls --enable-ladspa --enable-libass --enable-libcdio --enable-libdc1394 -
  
  -enable-libfaac --enable-nonfree --enable-libfdk-aac --enable-nonfree --
  
  disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame 
  
  --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --
  
  enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora 
  
  --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libx265 --
  
  enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --
  
  enable-postproc --enable-pthreads --disable-static --enable-shared --enable-
  
  gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-
  
  runtime-cpudetect" [3]=> string(40) " libavutil 54. 20.100 / 54. 20.100" 
  
  [4]=> string(40) " libavcodec 56. 26.100 / 56. 26.100" [5]=> string(40) " 
  
  libavformat 56. 25.101 / 56. 25.101" [6]=> string(40) " libavdevice 56. 
  
  4.100 / 56. 4.100" [7]=> string(40) " libavfilter 5. 11.102 / 5. 11.102" 
  
  [8]=> string(40) " libavresample 2. 1. 0 / 2. 1. 0" [9]=> string(40) " 
  
  libswscale 3. 1.101 / 3. 1.101" [10]=> string(40) " libswresample 1. 1.100 / 
  
  1. 1.100" [11]=> string(40) " libpostproc 53. 3.100 / 53. 3.100" [12]=> 
  
  string(30) "Input #0, gif, from 'gif.gif':" [13]=> string(29) " Duration: 
  
  N/A, bitrate: N/A" [14]=> string(76) " Stream #0:0: Video: gif, bgra, 
  
  563x307, 25 fps, 25 tbr, 100 tbn, 100 tbc" [15]=> string(24) "Unknown 
  
  encoder 'libvpx'" } int(1)

  ffmpeg -v returns this

  ffmpeg version N-80161-g7e0623b Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-4)
  
    configuration: --enable-libvpx
  
    libavutil      55. 24.100 / 55. 24.100
  
    libavcodec     57. 44.100 / 57. 44.100
  
    libavformat    57. 37.101 / 57. 37.101
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 46.100 /  6. 46.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  0.101 /  2.  0.101

  What am I missing ?