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• FFMPEG command for video based on ratio [duplicate]

  21 novembre 2017, par pocek

  This question already has an answer here :

  • FFMPEG : Add a fixed size image on a video, regardless of the video width & height (resolution)
    
    1 answer
    

  I am using ffmpeg (in linux server with php)

  and I want to watermark a png logo on the mp4 file, my problem is that

  I want to scale my logo and change it based on source video size(for example 1/4 of height),

  I have this code bellow :

  shell_exec('ffmpeg -i file.mp4 -i logo.png -filter_complex "overlay=10:10" file-watered.mp4");

  it works on every video.

  For Normal (medium) size image :

  

  For Small (medium) size image (which is bad !)

  

  Ideal output for this size would be :

  

  I’ve changed a little bit my first code like this :

  shell_exec('ffmpeg -i file.mp4 -i logo.png -filter_complex "[0:v]scale=500:-1[bg];[bg][1:v]overlay=(main_w-overlay_w):(main_h-overlay_h)" watered.mp4');

  The main problem is that, I want to change the logo size based on video size.

  How can I do it with ffmpeg ?

• Paperclip AV Transcoder not working on remote server

  25 novembre 2017, par zreitano

  I am able to upload videos locally. The videos are processed using paperclip and all the meta data is saved correctly, as well. When I tried to upload a video using our remote server, I received the error :

  Av::UnableToDetect (Unable to detect any supported library)

  I have installed ffmpeg using LinuxBrew. It says everything is installed correctly (checking which brew and which ffmpeg, as well as checking if the gem is appropriately installed).

  When I have styling in my model for the video (which is what enables the meta information to be stored and to have control over how the video is uploaded) it doesn’t work remotely.

  has_attached_file :video, path: "/posts/:id/:style.:extension",
  
    :styles => {
  
      :medium => { :geometry => "493x877", :format => 'flv' },
  
      :thumb => { :geometry => "100x100#", :format => 'jpg', :time => 10 },
  
      # :mobile => {:geometry => "640X480", :format => 'mp4', :streaming => true}
  
    }, :processors => [:transcoder]

  However, when I remove this from my model and have :

  has_attached_file :video, path: "/posts/:id/:style.:extension"

  The video is uploaded to S3 (without the data or styling that I need).

  Any help would be greatly appreciated. I think AV is having trouble finding ffmpeg but I am not sure why or how to go about fixing it. Thanks in advance for any advice.

• ffmpeg video will not play in browser

  27 janvier 2018, par Red

  I’m trying to create a simple video with an image and some audio using this command :

  ffmpeg -loop 1 -framerate 2 -i image.jpg -i audio.mp3 -c:v libx264 -c:a aac -strict -2 -preset medium -tune stillimage -crf 0 -shortest -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" -pix_fmt yuv420p -movflags +faststart output.mp4

  But the resulting video will not play in latest firefox, though it will play in chrome 63.

  ffmpeg stats :

  ffmpeg version 3.4.1-1+b1 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7 (Debian 7.2.0-18)
  
    configuration: --prefix=/usr --extra-version=1+b1 --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
  
  Hyper fast Audio and Video encoder

  Any ideas ?