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• ffmpeg multiple overlays at different times

  14 octobre 2017, par TheOctagon

  I have written a bash script which cycles through various RTMP live streams and switches every thirty seconds.
  I have a PNG sequence which plays at the start of the video (blindRev-%d.png). A blind is pulled up, revealing the stream.

  28 seconds later, I would like it to come back down to cover the stream so that when the next stream is loaded, it retracts to reveal the next stream in sequence once again (blind-%d.png). I’ve tried using itsoffset to accomplish this. No audio is required.

  However, only the first PNG sequence is played, the second never seems to happen.

  The command I am using is :

  ffmpeg -i rtmp://localhost/live/$stream -i blind/blindRev-%d.png -itsoffset 28 -i blind/blind-%d.png -filter_complex overlay -an -f flv rtmp://localhost/live/All

  What am I doing incorrectly ?
  Many thanks.

• FFmpeg macos install Reason : image not found

  26 avril 2019, par Joycon

  I’m trying to install FFmpeg on my mac.
  When I do

  brew install ffmpeg --with-chromaprint --with-fdk-aac
  
  --with-fontconfig --with-freetype --with-frei0r --with-game-music-emu --with-libass --with-libbluray --with-libbs2b --with-libcaca --with-libgsm --with-libmodplug --with-librsvg --with-libsoxr --with-libssh --with-libvidstab --with-libvorbis --with-libvpx --with-opencore-amr --with-openh264 --with-openjpeg --with-openssl --with-opus --with-rtmpdump --with-rubberband --with-sdl2 --with-snappy --with-speex --with-tesseract --with-theora --with-tools --with-two-lame --with-wavpack --with-webp --with-x265 --with-xz --with-zeromq --with-zimg

  This happens when I try to use FFmpeg

  dyld: Library not loaded: /usr/local/opt/rubberband/lib/librubberband.2.dylib  
  
  Referenced from: /usr/local/bin/ffmpeg  
  
  Reason: image not found  
  
  Abort trap: 6

• ffmpeg : cut multiple input files with seeking to one output file

  1er juin 2014, par Josef Kufner

  I have list of video files (loaded from database), each with start and end time of requested interval :

    # file   begin  end
  
    v1.mp4   1:01   2:01
  
    v2.mp4   3:02   3:32
  
    v3.mp4   2:03   5:23

  And I need to create single video file containing these intervals :

   [0:00]---v1---[2:00]---v2---[2:30]---v3---[5:50]

  I preffer usig ffmpeg, since it is installed on server. Caller program is written in PHP.

  It is easy to cut one input to one output (argument escaping removed for clarity) :

    exec("ffmpeg -ss $begin -i $input_file -ss $begin -c copy $output_file");

  I there any easier way than executing ffmpeg for each interval and then execute it once more to concatenate prepared clips together ? I really do not like to have a lot of temporary files or dealing with complex process handling.