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• SDL save screenshot on iOS

  12 avril 2018, par Law Gimenez

  I am trying to save a screen or frame from the SDL’s "window" into a PNG file and so I’m using SDL_image library. My code is below

  IMG_Init(Int32(IMG_INIT_PNG.rawValue))
  
  let screenShot = SDL_CreateRGBSurface(0, 640, 480, 32, 0, 0, 0, 0)
  
  SDL_SetRenderTarget(renderer, texture)
  
  SDL_RenderReadPixels(renderer, nil, Uint32(SDL_PIXELFORMAT_ARGB8888), screenShot?.pointee.pixels, (screenShot?.pointee.pitch)!)
  
  let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
  
  IMG_SavePNG(screenShot, "\(documentsPath)/image.png")
  
  SDL_FreeSurface(screenShot)

  But the image.png was not saved. If anyone can lead or help me. Thank you !

  Additional code, the image saved is just black

  IMG_Init(Int32(IMG_INIT_PNG.rawValue))
  
  let screenShot = SDL_CreateRGBSurface(Uint32(SDL_SWSURFACE), 640, 480, 32, 0, 0, 0, 0)
  
  // SDL_SetRenderTarget(renderer, texture)
  
  SDL_RenderReadPixels(renderer, nil, Uint32(SDL_PIXELFORMAT_ARGB8888), screenShot?.pointee.pixels, (screenShot?.pointee.pitch)!)
  
  // Save to documents directory
  
  let fileManager = FileManager.default
  
  do {
  
      let documentDirectory = try fileManager.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
  
      let fileUrl = documentDirectory.appendingPathComponent("imageLOL.png")
  
      if !fileManager.fileExists(atPath: fileUrl.path) {
  
          print("File NO exists")
  
          // Create file at path
  
          let data = Data()
  
          let createFile = fileManager.createFile(atPath: fileUrl.path, contents: data, attributes: nil)
  
          if createFile {
  
              print("Create file success")
  
          } else {
  
              print("Create file failed")
  
          }
  
      } else {
  
          print("File exists")
  
  
  
      }
  
      let result = IMG_SavePNG(screenShot, fileUrl.path)
  
      print("result = \(result)")
  
      // After saving screenshot
  
      let image = UIImage(contentsOfFile: fileUrl.path)
  
      let imageData = UIImagePNGRepresentation(image!)
  
      print("image length = \(String(describing: imageData?.count))")
  
      UIImageWriteToSavedPhotosAlbum(image!, nil, nil, nil)
  
      SDL_FreeSurface(screenShot)
  
  } catch {
  
      print("Error docs = \(error)")
  
  }

• FFMPEG unable to take frame and save as image

  2 mai 2013, par alex

  I'm trying to save an image from a video frame and save it as a jpeg.
  This function works for smaller video files, but if the video is over 10 minutes it won't save the jpeg image. An error comes up as before trans.

  public function VideoToJpeg($localVideoPath, $localOutImgPath)
  
  {
  
      $Name = dirname(__FILE__) . "/ffmpeg";
  
      $Str = "$Name -i \"$localVideoPath\" -an -ss 00:00:03 -an -r 1 -vframes 1 -y \"$localOutImgPath\"";
  
  
  
      exec($Str);
  
  }

  Here is the error I got from ffmpeg

  [NULL @ 0370e760] Unable to find a suitable output format for 'path'
  
  : Invalid argument

• How to save python compatible audio file from JavaScript blob

  16 septembre 2020, par Talha Anwar

  I am trying to save an audio blob to the backend.
Here is an audio blob

  


   const blob = new Blob(chunks, { 'type' : 'audio/wav; codecs=0' });


  


  Here is the upload function

  


  function uploadAudio( blob ) {
  var reader = new FileReader();
  reader.onload = function(event){
    var fd = {};
    fd["data"] = event.target.result;
    $.ajax({
     // contentType:"application/x-www-form-urlencoded; charset=UTF-8",
      type: 'POST',
      url: 'testing/',
      data: fd,
      dataType: 'text'
    }).done(function(data) {
        console.log(data);
        document.getElementById("response").innerHTML=data;
       // alert(data);
    });
  };


  


  Here is the function to save the file.

  


  def upload_audio(request):
    print('upload_audio')
    if request.is_ajax():
        
        req=request.POST.get('data')
        d=req.split(",")[1]
        print("Yes, AJAX!")
        #print(request.body)
        f = open('./file.wav', 'wb')
        
        f.write(base64.b64decode(d))
        #f.write(request.body)
        f.close()
    return HttpResponse('audio received')


  


  When I try to read it in python for converting to text. I got following error

  


  ValueError: Audio file could not be read as PCM WAV, AIFF/AIFF-C, or Native FLAC; check if file is corrupted or in another format


  


  I tried to convert the file

  


  import ffmpeg
stream = ffmpeg.input('file.wav')
stream = ffmpeg.output(stream, 'filen.wav')
ffmpeg.run(stream)


  


  I got following error

  


  Traceback (most recent call last):&#xA;  File "script.py", line 8, in <module>&#xA;    ffmpeg.run(stream)&#xA;  File "C:\Anaconda3\envs\VA\lib\site-packages\ffmpeg\_run.py", line 320, in run&#xA;    overwrite_output=overwrite_output,&#xA;  File "C:\Anaconda3\envs\VA\lib\site-packages\ffmpeg\_run.py", line 285, in run_async&#xA;    args, stdin=stdin_stream, stdout=stdout_stream, stderr=stderr_stream&#xA;  File "C:\Anaconda3\envs\VA\lib\subprocess.py", line 729, in __init__&#xA;    restore_signals, start_new_session)&#xA;  File "C:\Anaconda3\envs\VA\lib\subprocess.py", line 1017, in _execute_child&#xA;    startupinfo)&#xA;FileNotFoundError: [WinError 2] The system cannot find the file specified&#xA;</module>