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• error converting .caf to .mp3 in mvc 4

  17 avril 2014, par Jennifer

  I used to convert caf to mp3 using Wscript.shell and ffmpeg.exe when i was using asp.net
  but now i'm using a web api restful method in mvc 4, so i don't have a .aspx page
  i'm getting the following error :

     Description:System.Web.HttpException (0x80004005): The component 'Wscript.Shell' cannot be created.  Apartment threaded components can only be created on pages with an <%@ Page aspcompat=true %> page directive.

  but i don't have an aspx page to add this tag...

  the code i was using in aspx is :

     Dim wshShell As Object
  
     wshShell = Server.CreateObject("Wscript.Shell")
  
     cmd = "cmd.exe /k """"" & szCAF_PATH & """ -i """ & szPhysicalPath & """ " & Arguments & " """ & szEncodedPath & """"""
  
     wshShell.Run(cmd)
  
     Dim strCommand As String = "taskkill /F /IM cmd.exe"
  
     wshShell.Run(strCommand, 0, True)
  
     szDownloadLink = szDownloadLink.Replace(".caf", ".mp3")

  and the code in mvc4 is :

     wshShell = HttpContext.Current.Server.CreateObject("Wscript.Shell")
  
     cmd = "cmd.exe /k """"" & File.CAF_PATH & """ -i """ & File.PhysicalPath & """ " & File.Arguments & " """ & File.EncodedPath & """"""
  
     wshShell.Run(File.cmd)
  
     strCommand = "taskkill /F /IM cmd.exe"
  
     wshShell.Run(strCommand, 0, True)
  
     File.DownloadLink = File.DownloadLink.Replace(".caf", ".mp3")

  does anyone know how can i fix this ?

• lavf/ftp: check for truncation in snprintf

  25 novembre 2021, par Anton Khirnov

  lavf/ftp: check for truncation in snprintf
  Silences e.g. the following warning in gcc 10 :
  
  src/libavformat/ftp.c : In function ‘ftp_move’ :
  
  src/libavformat/ftp.c:1122:46 : warning : ‘%s’ directive output may be truncated writing up to 4095 bytes into a region of size 4091 [-Wformat-truncation=]
  
   1122 |     snprintf(command, sizeof(command), "RNTO %s\r\n", path) ;
  
        |                                              ^  
  
  src/libavformat/ftp.c:1122:5 : note : ‘snprintf’ output between 8 and 4103 bytes into a destination of size 4096
  
   1122 |     snprintf(command, sizeof(command), "RNTO %s\r\n", path) ;
  
        |     ^ 
  

  • [DH] libavformat/ftp.c

• How to scale video dimensions to a square format with maximum 640x640 using FFmpeg ? [closed]

  8 février 2024, par Mukhtor Rasulov

  I’m working with FFmpeg and need to scale video dimensions to a square format while ensuring that the maximum size is 640x640.

  


  Here are my requirements :

  


  

  1. If the original width and height of the video are greater than 640, I want to scale it down to 640x640.

  


  2. If the original width and height are both less than 640, I want to maintain the aspect ratio and set the dimensions to min(width, height) x min(width, height).

  


  3. The audio should be copied without any changes (using -c:a copy).

  


  4. Input video size will be max 50MB and I need output size less than 15MB

  


  


  My current approach is :

  


  ffmpeg -y -i 1.MOV -vf "crop=720:720, scale=640:640" -crf 21 -preset veryfast -c:a copy 1-640x640.MOV

  


  if the width and height eqauls, I just scale to square without cropping, because I can't lose items in video.

  


  I’ve tried various approaches, but the output size often ends up being much larger than the input. Could someone guide me on how to achieve this efficiently ? Additionally, I’m not sure if the -preset veryfast option is optimized for both time and video size. Any insights on that would be appreciated.

  


  Thank you in advance for your help !