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• Révision 116137 : complements de style sur les modeles de document remanies

  29 juillet 2019, par cedric@yterium.com

• Suppress black margins on the sides of an animation

  26 avril 2018, par Clinton Winant

  I need to make an animation out of a collection of jpeg images. The image size, as given by display, is 1200x900. I can control the size of the jpg images with convert, but not sure what a good size would be. I use the following ffmpeg call :

  ffmpeg -f image2 -i img%04d.jpg -r 24  sound.avi

  In spite of a long string of warnings like

  Past duration 0.879997 too large

  sound.avi is produced, however the animation includes black right and left margins (see attached screen shot of the first frame)

  

  that I need to suppress. I am under the impression that the 4x3 format of the jpg images is standard ? I view the animation with

  mplayer sound.avi

  The OS is Debian buster

  Further experiments suggest that the black margins disappear if the jpg files have an aspect ratio 16:9. Is that the only AR possible ?

  The output of

  ffmpeg -f image2 -i img%04d.jpg -vf cropdetect -vframes 5 -f null

  requested by @Gyan is

  ffmpeg version 3.4.2-2 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7 (Debian 7.3.0-15)
  
    configuration: --prefix=/usr --extra-version=2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Trailing options were found on the commandline.
  
  Input #0, image2, from 'img%04d.jpg':
  
    Duration: 00:00:00.40, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1200x900 [SAR 150:150 DAR 4:3], 25 fps, 25 tbr, 25 tbn, 25 tbc

• FFMPEG add circular mask to videos, convert to black and white and concatenate

  3 mai 2018, par Yassine

  Hello everyone i’m a beginner and i would appreciate your help.

  I’m making a mobile application that generates custom video resumes based on the user’s videos taken from his phone, the user has to upload 5 different videos to the server from the mobile application, in the server side i want to :

  • Add a .png circular mask to each video.
  • Make each video black and white.

  • Concatenate the videos with other already existing title videos
    (e.g [userVideo1] [title1] [userVideo2] [title2]...) Visual Example

    [Edit : I would like more features]

  • Add background music
  • Add watermark logo in the middle
  • Remove silent footage from the beginning and from the end
  • Some input videos might be rotated, i want to rotate videos back to normal if they are rotated.

  So far i managed to add the circular mask, make the videos black and white and concatenate 3 videos including a premade title video, but the second user video has no sound in the output.

  This is the script i ended up with :

  ffmpeg -i uservid1.mov -i uservid2.mp4 -i mask.png -i title1.mp4  -preset 
  
  ultrafast -filter_complex "
  
  
  
  [2:v][0:v]scale2ref[s1][s2];     
  
  [s2][s1]overlay[vid1];  
  
  [2:v][1:v]scale2ref[s3][s4]; 
  
  [s4][s3]overlay[vid2];  
  
  [vid1]hue=s=0[v0]; 
  
  [vid2]hue=s=0[v1];  
  
  [v0]scale=720x400[in0]; 
  
  [v1]scale=720x400[in1]; 
  
  [3:v]scale=720x400[in3]; 
  
  [in0]setsar=sar=0[final0]; 
  
  [in1]setsar=sar=0[final1];      
  
  [in3]setsar=sar=0[final3]; 
  
  [final0][final3][final1]concat=n=3;"
  
  
  
  -codec:a copy finalCV.mp4