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• ‘_snprintf’ was not declared in this scope

  3 avril 2015, par Yoohoo

  I am working on a ffmepg c++ project which links a hpp file, in the hpp file :

  #define snprintf _snprintf
  
  #include 
  
  #include <cstdio>
  
  #include 
  
  include 
  
  
  
  #if defined _MSC_VER &amp;&amp; _MSC_VER >= 1200
  
  #pragma warning( disable: 4244 4510 4512 4610 4146 4996 4005)
  
  
  
  #define sprintf sprintf_s
  
  #define _sprintf _sprintf_s
  
  #define _snprintf _snprintf_s
  
  
  
  #endif  
  
  
  
  
  
  snprintf (oc->filename, sizeof(oc->filename), "%s", filename);
  
  </cstdio>

  it gives the error :

  ‘_snprintf’ was not declared in this scope

  It is quite weird the error shows ‘_snprintf’ while what I use is ’snprint’. This code is wrote by others, I did not understand these #define he used. If i remove the line #define sprintf sprintf_s, it gives error :

  segmentation fault(core dumped)

  Due to ffmpeg is incompatible with C++, I have include the stdio.h and cstdio both within extern C and out of extern C, but the error continue show out. What is the problem ? How to fix it ?

• ffmpeg throws conversion error, but only if the triggering web request is made from safari ?

  22 novembre 2022, par Kyoshiro Kokujou Obscuritas

  I'm using ffmpeg to do an on-the-fly conversion of audio files to ensure high compatibility. i'm converting them to OGG. and all of this is done by a .NET 6 REST service.
This service is then accessed by a javascript Frontend.
Now the problem. The exact same request runs through without any problems on Windows + Firefox, but it does not on Safari. In Safari it says something about "unknownConversion failed"

  


  it's the same file, it's the same name, and to make sure there are no weird invisible characters i used the Microsoft File API to convert it to a proper file path.

  


  code looks like this

  


  var ffmpeg = new Process();
        var startInfo = new ProcessStartInfo("D:\\Programme\\ffmpeg\\bin\\ffmpeg.exe",
            $"-i \"{path.FullName}\" -c:a libopus -f ogg -")
        {
            RedirectStandardError = true,
            RedirectStandardOutput = true,
            RedirectStandardInput = true,
            UseShellExecute = false,
            CreateNoWindow = true
        };
        ffmpeg.EnableRaisingEvents = true;
        ffmpeg.StartInfo = startInfo;
        ffmpeg.ErrorDataReceived += OnErrorDataReceived;
        ffmpeg.Exited += OnFinished;

        ffmpeg.Start();
        ffmpeg.BeginErrorReadLine();

        return File(new BufferedStream(ffmpeg.StandardOutput.BaseStream), "audio/ogg");


  


  Complete Logs : https://pastebin.com/tTUcsjuT

  


• Negative or 0 second duration

  3 mars 2023, par Nif

  I recently came across plenty of weird videos with negative durations

  


  firstly 0 seconds :
https://cdn.discordapp.com/attachments/397056507243528203/739081902278836234/short_video.webm

  


  And negative duration :
https://cdn.discordapp.com/attachments/397056507243528203/739081962211377152/CorruptFile.webm

  


  I tought it was a trick with webms but there also is a mp4 :
https://cdn.discordapp.com/attachments/397056507243528203/739081981643718687/video0-21.mp4

  


  I would love to know how I can make videos like these