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• VB.NET : How to maintain main form control during loops in other sub ?

  5 février 2015, par Zed Machine

  I have a program with only one form.
  By pressing a button it starts a ffmpeg conversion.

  In the main form, in textboxes, ffmpeg stats are outputted. This is possible by taking StandardError output from ffmpeg.

  Public Sub Console()
  
          Dim Process As New Process 
  
  
  
          Process.StartInfo.UseShellExecute = False
  
          Process.StartInfo.RedirectStandardError = True
  
          Process.StartInfo.RedirectStandardOutput = True 
  
          Process.StartInfo.FileName = current_ffmpeg_path 
  
          Process.StartInfo.Arguments = input_params 
  
          Process.StartInfo.CreateNoWindow = True 
  
          Process.Start() 
  
  
  
          Dim ffmpeg_stats_output As System.IO.StreamReader = Process.StandardError
  
  
  
          Do While Process.HasExited = False
  
          [update all main form textboxes by taking input string from ffmpeg and elaborate it]
  
          Loop
  
  End Sub

  The problem is that while this loop is executed the textboxes and progress bar are updated but the main form cannot be modified. There is in fact no control at all by user. So if I want to make a button to stop/pause ffmpeg in main form this cannot be pressed as anything else on the main form.

  there is a way to maintain loops inside other Sub without loose control of main form while they’re running ?

  I tried to fix it by calling another dialog form with textboxes and progress bar. But even this form loose completely control until the process is finished.

  To send pause/stop conversion to ffmpeg (that runs without a window) is it correct use :

  Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
  
  SendKeys.Send("q")
  
  SendKeys.Send("^s") 
  
  End Sub

  or must be specified that this key is sent to the current running Process ?

• How can I get the volume of sound of a video in Python using moviepy ?

  24 janvier 2015, par evil_inside

  I want to get the volume of sound of a video so I use the following :

  import numpy as np # for numerical operations
  
  from moviepy.editor import VideoFileClip, concatenate
  
  
  
  clip = VideoFileClip("soccer_game.mp4")
  
  cut = lambda i: clip.audio.subclip(i,i+1).to_soundarray(fps=22000)
  
  volume = lambda array: np.sqrt(((1.0*array)**2).mean())
  
  volumes = [volume(cut(i)) for i in range(0,int(clip.audio.duration-2))] 

  But I get these errors :

  Exception AttributeError: "VideoFileClip instance has no attribute 'reader'" in <bound method="method" of="of" instance="instance" at="at" 0x084c3198="0x084c3198">> ignored
  
  
  
  WindowsError: [Error 5] Access is denied
  
  </bound>

  I am using IPython notebook and Python 2.7.
  I assume something doesn’t have the appropriate permissions. I have changed run this program as an administrator for ffmpeg.exe, ffplay.exe, ffprobe.exe.

• mpegvideo_enc : Draw edges on input for non-multiple of 16 resolutions

  16 février 2013, par Michael Niedermayer

  mpegvideo_enc : Draw edges on input for non-multiple of 16 resolutions
  This improves motion estimation and avoids using uninitialized data
  
  for resolutions that aren’t a multiple of 16.
  Prior to d2a25c40, the edges used to be initialized so that encoding
  
  was deterministic, but after that commit it started using uninitialized
  
  data (for non multiple of 16 resolutions).
  CC : libav-stable@libav.org
  
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavcodec/mpegvideo_enc.c