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• OpenFaas. Write python function with FFmpeg using

  11 August 2021, by Валентин Никин

  I need to write OpenFaas function which can accept binary file as parameter. This function will extract some data from that binary file. Based on that data function will generate ffmpeg command. And finally function must be call ffmpeg to process generated command and return file as output.

  


  Function language must be python, because I need to use some python modules to process input binary file.

  


  The main questions:

  


  

  1. Can I accept binary a file as function parameter (in python function)?

  


  2. Can I call ffmpeg from python function, and return binary file as output?

  


  


  I have already met with alexellis official example (https://github.com/alexellis/openfaas-streaming-templates) but that example used bash language.

  


  I have one idea, but I don't know is it correct.
Maybe I can use example with bash, to accept binary file as parameter, then I call python script, after that I call ffmpeg, and return file as output as described in the example.
But I need some python modules available with pip. So, I don't know how I can got this.

  


  I'm newest in OpenFaas, so any idea would be appriciated

  


• MobileFFMPEG Output file #0 does not contain any stream

  30 September 2020, by Alhaj

  I am using implementation 'com.arthenica:mobile-ffmpeg-full:4.4'

  


  I just want o crop audio file to 10 second to 20 second

  


  '''
fun cropAudio(input :String)

  


      val newFileName = UUID.randomUUID().toString()

    val location: String = getBatchDirectoryName()!!

    val output: String = location + "/" + newFileName + ".mp3"

    val temp=" -i $input -ss 60 -to 70 $output"

    Log.e("alhaj", " a $s")

    FFmpeg.execute(temp, object : ExecuteCallback {

        fun onSuccess(message: String?) {
            uploadOnFirebase(output, title)
            mediaPlayer.stop()
            Log.e("alhaj", message!!)
        }

        override fun apply(executionId: kotlin.Long, returnCode: Int) {
            if (returnCode == RETURN_CODE_SUCCESS) {
                Log.i("alhaj", "Async command execution completed successfully.");
            } else if (returnCode == RETURN_CODE_CANCEL) {
                Log.i("alhaj", "Async command execution cancelled by user.");
            } else {
                Log.i("alhaj", String.format("Async command execution failed with rc=%d.", returnCode));
            }
        }
    }.toString())
}


  


  '''

  


  but i am getting error

  


  '''

  


  2020-09-30 03:13:41.079 10300-10410/com.example.touchmeadmin I/mobile-ffmpeg: Output #0, mp3, to ' -i /storage/emulated/0/AJ backup/songs/Maroon 5 - Memories (Official Video) ( 256kbps cbr ).mp3 -ss 60 -to 70 /storage/emulated/0/Android/data/com.example.touchmeadmin/files/Music/830350fd-5218-4ee0-bd99-0dd50b802930.mp3':
2020-09-30 03:13:41.079 10300-10410/com.example.touchmeadmin E/mobile-ffmpeg: Output file #0 does not contain any stream

  


  '''

  


• avfilter/f_ebur128: add all sample rates support

  4 March 2021, by Paul B Mahol

  avfilter/f_ebur128: add all sample rates support
  The magic constants come from the unofficial "ITU-R BS.1770-1 filter
  
  specifications"¹ by Raiden (libebur128) which relies on "Parameter
  
  Quantization in Direct-Form Recursive Audio Filters"² by Brian
  
  Neunaber.
  The constants seem to include a quantization bias, for example:
  
   Vb is supposed to be exactly √Vh in a high shelf filter
  
   the Pre-filter Gain should likely be 4dB
  
   Pre Q and RLB Q are respectively very close to √½ and ½
  Those are not adjusted to prevent the values from drifting away from
  
  the official specifications.
  An alternative to this approach would be to requantize on the fly as
  
  proposed by pbelkner³, where the 48kHz code path would use the exact
  
  specifications constants while derivating constants for other
  
  frequencies.
  [1]: https://www.scribd.com/document/49991813/ITU-R-BS-1770-1-filters
  
  [2]: https://www.scribd.com/document/6531763/Direct-Form-Filter-Parameter-Quantization
  
  [3]: https://hydrogenaud.io/index.php?topic=86116.msg740092#msg740092
  

  • [DH] libavfilter/f_ebur128.c