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• using ffmpeg in XCode : Operation not permitted

  23 octobre 2019, par NCrusher

  In an effort to try to get to the bottom of the problem I discussed here, I decided to try to get what I was doing closer to the example I borrowed from when writing my code, which is described here.

  So instead of formatting my filters in another methods, I tried to code them directly into the method to run the conversion. Unfortunately this results in a very repetitive method, because I have to handle the switch statement for the different conversion choices here as well.

  So this is what my method looks like now :

  func ffmpegConvert() {
  
      guard let launchPath = Bundle.main.path(forResource: "ffmpeg", ofType: "") else { return }
  
      do {
  
          let conversionChoice = conversionOptionsPopup.indexOfSelectedItem
  
          switch conversionChoice {
  
              case 1 :
  
                  let convertTask: Process = Process()
  
                  convertTask.launchPath = launchPath
  
                  convertTask.arguments = [
  
                      "-y",
  
                      "-i", "\(inputFilePath)",
  
                      "-c:a", "libmp3lame",
  
                      "-ac", "1",
  
                      "-ar", "22050",
  
                      "-q:a", "9",
  
                      "\(outputFilePath)"
  
                  ]
  
                  convertTask.standardInput = FileHandle.nullDevice
  
                  convertTask.launch()
  
                  convertTask.waitUntilExit()
  
              case 2 :
  
                  let convertTask: Process = Process()
  
                  convertTask.launchPath = launchPath
  
                  convertTask.arguments = [
  
                      "-y",
  
                      "-i", "\(inputFilePath)",
  
                      "-c:a", "libmp3lame",
  
                      "-ac", "2",
  
                      "-ar", "44100",
  
                      "-q:a", "5",
  
                      "\(outputFilePath)"
  
                  ]
  
                  convertTask.standardInput = FileHandle.nullDevice
  
                  convertTask.launch()
  
                  convertTask.waitUntilExit()
  
              case 3 :
  
                  let convertTask: Process = Process()
  
                  convertTask.launchPath = launchPath
  
                  convertTask.arguments = [
  
                      "-y",
  
                      "-i", "\(inputFilePath)",
  
                      "-c:a", "libmp3lame",
  
                      "-ac", "1",
  
                      "-ar", "22050",
  
                      "-b:a", "32k",
  
                      "\(outputFilePath)"
  
                  ]
  
                  convertTask.standardInput = FileHandle.nullDevice
  
                  convertTask.launch()
  
                  convertTask.waitUntilExit()
  
              case 4 :
  
                  let convertTask: Process = Process()
  
                  convertTask.launchPath = launchPath
  
                  convertTask.arguments = [
  
                      "-y",
  
                      "-i", "\(inputFilePath)",
  
                      "-c:a", "flac",
  
                      "\(outputFilePath)"
  
                  ]
  
                  convertTask.standardInput = FileHandle.nullDevice
  
                  convertTask.launch()
  
                  convertTask.waitUntilExit()
  
              default :
  
                  let convertTask: Process = Process()
  
                  convertTask.launchPath = launchPath
  
                  convertTask.arguments = [
  
                      "-y",
  
                      "-i", "\(inputFilePath)",
  
                      "-c", "copy",
  
                      "\(outputFilePath)"
  
                  ]
  
                  convertTask.standardInput = FileHandle.nullDevice
  
                  convertTask.launch()
  
                  convertTask.waitUntilExit()
  
          }
  
      }
  
  }

  The good news is : I didn’t get the same errors I was getting before.

  The bad news is : I got a different one. "Operation not permitted."

  I assume this has something to do with the permissions granted to processes running in XCode when testing them out. Is there a way to get around it ?

  My project is really dead in the water until I get the ffmpeg implementation worked out, because everything else I’m going to want it to do—such as rechaptering audiobooks and/or editing metadata—is going to rely upon ffmpeg as well. But I’ve only been doing this a few weeks and whatever is going on here is outside my ability to troubleshoot.

  EDIT : I managed to get around this by turning the sandbox option in the permissions file off. But I’m leaving this question up because I’m not at all sure that was the right thing to do.

• cannot capture a good frame of faces from IP camera [on hold]

  16 octobre 2018, par wiwengweng

  everyone. I am working on some research about getting frames from IP camera, and then detect and recognize faces. There is some implements on the last two steps. And my first problem is to judge if a frame with faces is good enough for detection. Video stream is read by OpenCV and/or ffmpeg, and there are many ways to capture frames one by one.

  As we know, people are always walking through, so frames captured from IP camera is not always good. But the good news is the if we extract the frames from the IP camera video file, we find some frames good enough for detection.

  I also try de-blurring pictures of frames using GAN, but that will need more time, so I think that is not an ideal way. So any advice is welcome.

• ASP.net swf game file preview (thumbnail)

  12 avril 2015, par Moatasem bakri

  Scenario :

  I really in need for your help.
  I have multiple swf game files which I want to view them on the page as thumbnails and let the visitor click on it to play the game.

  Required :

  I want a tool that let make take a thumbnail from swf file, maybe the first frame of the file as image to view it.

  maybe if there another way to preview the files in asp.net pages without the need to the following way could be better.

  Bad news

  I have viewed all the possible answers on StackOverFlow and even on Google but with no luck, they lead my to the following :

  • use : https://swf.codeplex.com/ : I have tried it and now result
  • use ffmpeg : but the feature is not available yet, and I’m getting the following error
    ’swf : could not find codec parameters’