Recherche avancée

Sur d’autres sites (10324)

• Python moviepy, CompositeVideoClip is Slow and Wierd

  4 mars 2023, par Dan

  I want to add a .mov transparent overlay on top of a .mp4 video, and for that I am using movipy and CompositeVideoClip, but it's too slow.

  


  The speed is 40 it/s when only the video is rendering but when it comes to the overlay it is only 5 it/s. To speed it up I have used use_bgclip=True and now I get 90 it/s but when the overlay comes I still get 5 it/s, and when I use use_bgclip=True there are 2 'bugs' that appears :

  


  

  1. The video freezes after the overlay is done playing.

  


  2. The audio of the video is lost and the overlay sound is the only one left

  


  


  For the two 'bugs', I found a good enough solution, but I want to speed up the process when the overlay comes, because 5 it/s it's way too slow. I have tried to use codec="h264_nvenc" or higher crf but the speed is the same.

  


  Is there a way to speed this up ? (I don't care if I need to use other libraries)

  


  import moviepy.editor as mp
video = mp.VideoFileClip("video.mp4")

overlay = mp.VideoFileClip("overlay.mov", has_mask=True)
overlay = overlay.set_start(5) # start the overlay 5 seconds after the video starts

compose = mp.CompositeVideoClip([video, overlay], use_bgclip=True, size=video.size)
compose = compose.set_duration(video.duration) # fix bug 1
compose = compose.set_audio(video.audio) # fix bug 2 (but I lost the audio from the overlay)

compose.write_videofile("cf15.mp4", codec="libx264", preset="veryfast", ffmpeg_params=["-crf", "15"])

compose.close()
video.close()


  


• How to pause ffmpeg than runs without window ?

  5 février 2015, par Zed Machine

  I’m working on a video converter and I wanted to be able to stop or pause ffmpeg by pressing a button. Googleing I have found a way but it’s not working. basically I Start ffmpeg on a background worker in this way :

  Private Sub bw_DoWork(ByVal sender As Object, ByVal e As DoWorkEventArgs)
  
  
  
          Dim Proc As New Process
  
  
  
          Proc.StartInfo.UseShellExecute = False
  
          Proc.StartInfo.RedirectStandardError = True
  
          Proc.StartInfo.RedirectStandardOutput = True
  
          Proc.StartInfo.FileName = current_ffmpeg_path
  
          Proc.StartInfo.Arguments = input_params
  
          Proc.StartInfo.CreateNoWindow = True
  
          Proc.Start()
  
  
  
  [do things...]

  then inside a loop I place an if to pause ffmpeg :

  If (pause = 1 Or pause = 2) Then
  
          AppActivate(Proc.Id)
  
          SendKeys.SendWait("^(s)")
  
          SetForegroundWindow(Me)
  
          pause = 0
  
      End If

  but it’s not working.. maybe cause of AppActivate that need a window to work while instead ffmpeg is running without it. There is another way ? maybe not with sendkeys ?

• How to get FFMPEG conversion progress to progressbar in a C# WPF application ?

  19 mars 2018, par adrifcastr

  So I’m using the code below to convert a specified file, by running ffmpeg, and I need the progress to be visible in a progressbar, so I#d need to get it to display the cmd output to my textbox in realtime and from there get it to being displayed by the progressbar, any help ?

   private void convertbutton_Click(object sender, RoutedEventArgs e)
  
      {
  
          string resdir = AppDomain.CurrentDomain.BaseDirectory + "\\res";
  
          Extract("ADC", AppDomain.CurrentDomain.BaseDirectory + "\\res", "res", "ffmpeg.exe");
  
  
  
          string ffdir = AppDomain.CurrentDomain.BaseDirectory + "\\res\\ffmpeg.exe";
  
          string arg =  @"-y -activation_bytes ";
  
          string arg1 = @" -i ";
  
          string arg2 = @" -ab 80k -vn ";
  
          string abytes = bytebox.Text;
  
          string arguments = arg + abytes + arg1 + openFileDialog1.FileName + arg2 + saveFileDialog1.FileName;
  
  
  
          Process ffm = new Process();
  
          ffm.StartInfo.FileName = ffdir;
  
          ffm.StartInfo.Arguments = arguments;
  
          ffm.StartInfo.CreateNoWindow = true;
  
          ffm.StartInfo.RedirectStandardOutput = true;
  
          ffm.StartInfo.RedirectStandardError = true;
  
          ffm.StartInfo.UseShellExecute = false;
  
          ffm.StartInfo.WorkingDirectory = Directory.GetCurrentDirectory();
  
          ffm.Start();
  
  
  
          ffm.WaitForExit();
  
          ffm.Close();
  
  
  
          Directory.Delete(resdir, true);
  
      }

  FFMPEG Output regulary looks like this :

  size=    4824kB time=00:08:13.63 bitrate=  80.1kbits/s speed=  33x