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• why cmd just print command and dosen't work ?

  11 octobre 2019, par 杨士弘

  I tried create a website that could upload mp4 then my server would transcode it to ts and create a m3u8 playlist。
  I wanted to use cmd to control ffmpeg to do this，and I use visual basic to do this.

  Here is my code：

    Dim fileName As String = "borderoflife"
  
    Dim file As String = "borderoflife.mp4"
  
    Dim appPath As String = "C:\allen0916\"
  
    Dim saveDir As String = "test2\"
  
  
  
    Dim savePath As String = appPath & saveDir
  
    Dim saveResult As String = savePath & file
  
  
  
    Dim Content_Type_A As String = "video/mp4"
  
  
  
    Dim m3u8Path As String = Path.Combine(savePath, fileName + ".m3u8")
  
    Dim para As String = String.Format("/C ffmpeg -i {0} -profile:v baseline -level 3.0 -s 640x360 -start_number 0 -hls_time 10 -hls_list_size 0 -f hls {1} ", saveResult, m3u8Path)
  
  
  
    Dim output As String = "none" 
  
    Dim p As Process = New Process()
  
  
  
    p.StartInfo.FileName = "cmd.exe"
  
    p.StartInfo.UseShellExecute = False 
  
    p.StartInfo.RedirectStandardInput = True 
  
    p.StartInfo.RedirectStandardOutput = True 
  
    p.StartInfo.RedirectStandardError = True 
  
    p.StartInfo.CreateNoWindow = True 
  
    p.Start()
  
    p.StandardInput.WriteLine(para) 
  
    p.StandardInput.WriteLine("exit")
  
    p.StandardInput.AutoFlush = True
  
    p.StandardInput.Close() 
  
    output = p.StandardOutput.ReadToEnd() 
  
    p.WaitForExit()
  
    p.Close()
  
  
  
   If System.IO.File.Exists(m3u8Path) <> True Then
  
        context.Response.Write(output)
  
    Else
  
        context.Response.Write("Success")
  
    End If  

  and every time output just returns ：

  Microsoft Windows [version 10.0.17763.737]
  
  (c) 2018 Microsoft Corporation. 
  
  
  
  c:\windows\system32\inetsrv>/C ffmpeg -i C:\allen0916\test2\borderoflife.mp4 -profile:v baseline -level 3.0 -s 640x360 -start_number 0 -hls_time 10 -hls_list_size 0 -f hls C:\allen0916\test2\borderoflife.m3u8 
  
  
  
  c:\windows\system32\inetsrv>exit

  it seems cmd.exe just print my command and not working，
  Dose somebody know why？

• batch FOR loop with FFMPEG

  27 décembre 2014, par user3604398

  I want to divide a .mp4 file into smaller .mp4 clips using ffmpeg.

  This is the code without a loop :

  ffmpeg -i source-file.mp4 -ss 0 -t 600 first-10-min.mp4
  
  ffmpeg -i source-file.mp4 -ss 600 -t 600 second-10-min.mp4
  
  ffmpeg -i source-file.mp4 -ss 1200 -t 600 third-10-min.mp4
  
  ...

  How do I make it into a loop in Microsoft DOS ? So far I have this :

  for /r $i in (*.mp4) do "C:\Program Files\FFMPEG\bin\ffmpeg.exe" -i "C:\Users\Name\Videos\2014-12-27-0926-45.mp4" -ss 0 -t 600

  Also someone said to put -codec copy in somewhere but I don’t know where.

• How to add Overlay/Watermark Text opacity or transparency by FFmpeg ?

  28 novembre 2022, par ujjally

  I want to add overlay/watermark text into video with custom opacity or transparency like 50%(0.5) and 80%(0.8)

  


  I tried the below code but the opacity color automatically set to black.

  


  ffmpeg -i video.mp4 -vf drawtext="fontfile='C\:/Users/BRIGHT/AppData/Local/Microsoft/WINDOWS/fonts/RacingSansOne-Regular.ttf':text='YouTube.com':fontsize=h/15:fontcolor=yellow@0.5:bordercolor=white:borderw=1:y=(h-text_h*24):x=(mod(-0.5*n\,w+tw)-tw)" -codec:a copy output.mp4