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• FFmpeg concat two videos with background audio using HLS

  13 avril 2018, par michail_w

  I would like to make HLS stream of one video which has sound with mixed background audio from MP3 file. I don’t want to re-encode the video, it’s format is ok for my output.

  My non-working attempts :

  1. Mixed audio from video and MP3 as HLS stream, but I can’t see the image

  echo 'movie=filename=/var/project/video.mp4:streams=dv+da ' \
  
      '[clip0_v] [clip0_a]; [clip0_v] copy [clip0_joinv]; ' \
  
      'amovie=filename=/var/project/background.mp3:loop=1, ' \
  
      'afade=type=out:start_time=10.147:duration=5 ' \
  
      '[mixin_audio]; [clip0_a][mixin_audio] amix=duration=first [out1]; ' \
  
      '[clip0_joinv] copy [out0]' \
  
  | /var/project/bin/ffmpeg -f lavfi \
  
      -graph_file /dev/stdin -i nullsrc \
  
      -vcodec copy -acodec aac -strict -2 -b:a 48k \
  
      -f hls -hls_time 1 -hls_list_size 999999999 \
  
      /var/project/output/stream.m3u8

  2. Mixed audio from video and MP3 with visible image, but it doesn’t work as HLS (i have to wait for whole video to be generated instead to be strimmed) :

  echo 'movie=filename=/var/project/video.mp4:streams=dv+da ' \
  
      '[clip0_v] [clip0_a]; [clip0_v] copy [clip0_joinv]; ' \
  
      'amovie=filename=/var/project/background.mp3:loop=1, ' \
  
      'afade=type=out:start_time=10.147:duration=5 ' \
  
      '[mixin_audio]; [clip0_a][mixin_audio] amix=duration=first [out1]; ' \
  
      '[clip0_joinv] copy [out0]' \
  
  | /var/project/bin/ffmpeg -f lavfi \
  
      -graph_file /dev/stdin -i nullsrc \
  
      -acodec aac -strict -2 -b:a 48k \
  
      -f hls -hls_time 1 -hls_list_size 999999999 \
  
      /var/project/output/stream.m3u8

  How can I do it ?

• Building and using OpenCV as a static library with Ffmpeg

  11 octobre 2016, par Matt Hammond

  I’m trying write an OpenCV application. I’ve statically built OpenCV from source as I don’t want dll files and my project compiles as long as I don’t use cv::VideoCapture, in which case I get a link error LNK2019 unresolved external symbol.

  I think this is because the cv::VideoCapture uses ffmpeg to work with video, which, because of it’s license, cannot be statically linked in my project. I would be ok with linking the ffmpeg dynamically but I’m having trouble doing this. There is a opencv_ffmpeg310_64.dll file in the %OpenCV_DIR%\bin folder, but I’m clueless about how to dynamically link it to my project. Usually I have .lib files that come with the .dll but I can’t find them anywhere.

  Is it possible to statically link OpenCV and dynamically link ffmpeg, and how should I go about doing this ?

  Additional info :

  • Windows 10
  • Visual Studio 2015
  • OpenCV 3.1.0 x64 build

• I can't understand how to use ffmpeg in javascript (if it's even possible)

  28 juin, par Laimonas Rupeika

  Straight to the problem, I want to use ffmpeg in my javascript project for video editing. So I found cdn : <code class="echappe-js">&lt;script src=&quot;https://cdn.jsdelivr.net/npm/@salomvary/ffmpeg.js-umd@3.1.9001/ffmpeg-mp4.min.js&quot;&gt;&lt;/script&gt; which references to "https://github.com/Kagami/ffmpeg.js", which is ffmpeg port to javascript as I understand ?
I don't get any errors on import, but if I try loading ffmpeg :

  


  // Initialize FFmpeg after the GAPI client is loaded
  const ffmpeg = createFFmpeg({ log: true });

  // // Load the FFmpeg library
  await ffmpeg.load();


  


  I get error : Uncaught (in promise) ReferenceError: createFFmpeg is not defined at initializeGapiClient (index:89:18) and it also messes my whole project. So if possible, how can I use ffmpeg in pure javascript, not Node.js. Should I download ffmpeg library files and then include them in project, I'm totally lost at this.