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• dnn/openvino : add input/output name info

  9 septembre 2020, par Ting Fu

  dnn/openvino : add input/output name info
  show all input/output names when the input or output name not correct
  Signed-off-by : Ting Fu <ting.fu@intel.com>
  
  Signed-off-by : Guo, Yejun <yejun.guo@intel.com>
  

  • [DH] libavfilter/dnn/dnn_backend_openvino.c

• How to get info on a partial incoming mov file in javascript ? [closed]

  30 août 2020, par David542

  I'm not sure if this is more a JavaScript question or ffmpeg, but suppose I have a scenario where a user is uploading a 100GB file. And, before they upload it (or actually, as soon as we detect the first few frames or whatever), we want to make sure that it is a "valid" file — let's say for this question we want to verify that it is :

  


  

  • 29.97 fps

  


  • Video bitrate > X

  


  • Codec of com.apple.finalcutstudio.prores

  


  


  What would be the best way to do this ? I was thinking something like :

  


  

  1. A user clicks the upload button and selects their file.

  


  2. We upload the first 1MB of that file to our server — check that using ffmpeg (how to ignore errors or something with ffmpeg ?)

  


  3. If the file passes our initial checks we upload the entire video file. If not, we raise a warning to the end user and stop the upload.

  


  


  How could this process be done ? I am seeking a JavaScript snippet (JS Fiddle ?) and a backend snippet (to receive the partial input and issue the ffmpeg commands).

  


• Get ffmpeg info from Pipe (stdout)

  12 août 2020, par Peter Silie

  I want to call ffmpeg to get the duration of a video file. When using the command in OSX Terminal everything works fine :

  


  ffmpeg -i MyVideo.MOV 2>&1 | grep "Duration"


  


  I get this :

  


    Duration: 00:01:23.53, start: 0.000000, bitrate: 39822 kb/s


  


  It is perfect for me. But now I tried this call from within my code :

  


  func shell(launchPath: String, arguments: [String]) -> String
{
    let task = Process()
    task.launchPath = launchPath
    task.arguments  = arguments

    let pipe = Pipe()
    task.standardOutput = pipe
    
    do {
        try task.run()
        // task.launch() till 10.12, but now catchable!
    } catch let error as NSError {
        print(error.localizedDescription)
        return ""
    }
    
    let data = pipe.fileHandleForReading.readDataToEndOfFile()
    let output: String = NSString(data: data, encoding: String.Encoding.utf8.rawValue)! as String

    return output
}


  


  This code works fine for all other external commands. But here I get error :

  


  [NULL @ 0x107808800] Unable to find a suitable output format for '2>&1'
2>&1: Invalid argument


  


  I defined the arguments for ffmpeg like this :

  


  let arguments = ["-i", video.path, "2>&1", "|", "grep \"Duration\"" ]


  


  Even if I put them all in one argument as a larger string, it doesn't work. Using "pipe:1" instead of "2>&1" and rest of arguments results also in an error.

  


  Any idea, how I get it to work ?