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• Adding audio to an OpenCV video

  21 février 2019, par pcrunn

  I’m trying to make a script that automates the process of making a video and i’m stuck on the part that i add the audio, I’m not sure if i’ll need to use ffmpeg for that and if so, i’m not sure how to use it the proper way to work with OpenCV (Which I use for rendering the video).

  Thanks for your time, Here is my current code (that I found from a website)

  # Creating the video... The worst part. Literally
  
  
  
  width = 1920
  
  height = 1080
  
  FPS = 30
  
  length = 0
  
  
  
  for song in songs:
  
      length+=song.info.length
  
  
  
  length = int(length)
  
  
  
  fourcc = VideoWriter_fourcc(*'MP42')
  
  video = VideoWriter('result.avi', fourcc, float(FPS), (width, height))
  
  for _ in range(FPS*length):
  
      frame = np.random.randint(0, 256,
  
                                (height, width, 3),
  
                                dtype=np.uint8)
  
      video.write(frame)
  
  
  
  video.release()

• Get a thumb from a partial loaded file with flutter web [closed]

  6 novembre 2024, par JD11

  I use ffmpegwasm javascript port ffmpeg to get thumbnail of video files using flutter. Some time files are very large. Can i download only a part of file (using html header range) and get a thumbnail.

  


  to get part of file i use

  


        var response = await http.get(Uri.parse(bUrl!), headers: {"range": "bytes=0-10000000"});
      data = response.bodyBytes;

ffmpegWasm!.writeFile('temp.mp4', data);

  await ffmpegWasm!.run([
    '-y',
    '-ss',
    '00:00:01',
    '-i',
    'temp.mp4',
    '-vframes',
    '1',
    "-an",
    "-vf",
    "scale=$width:-1",
    outName
  ]); // '-c:a', 'copy'

  return ffmpegWasm!.readFile(outName);


  


  but i get an error reached eof, corrupted STCO atom.

  


  I know that VLC can display image even on incomplete file.

  


  thank you in advance

  


• How to import and use FFmpegInteropX.FFmpegUWP ?

  14 janvier, par Boris

  I am writing a WinUI3 app. I need it to play a .mkv video file using MediaPlayerElement control. Out of box, .mkv file types are not supported. So I came upon a package FFmpegInteropX.FFmpegUWP (current v5.1.100) and installed it to the solution via Visual Studio NuGet Package Manager. The installation went fine and the package is definitely part of the project :

  


  <packagereference include="FFmpegInteropX.FFmpegUWP" version="5.1.100"></packagereference>

  


  The problem I have is that when I type using FFmpegInteropX; it is not recognized and I cannot use it. I've noticed there is also a FFmpegInteropX package (so without the ".FFmpegUWP" part) and I tried installing that one too, as I was trying to make the using statement work. However, it appears that that package is not intended for WinUI3 projects and NuGet removed it.

  


  Now, I am clueless on how to use the FFmpegInteropX.FFmpegUWP in the project. Could anyone please explain why I might be experiencing this problem ?