Trouble converting videos on virtual directories using Windows Media Encoder

[clinnebur]

We have an ASP.NET web application (C#) that copies videos from a CCTV truck to a Linux server. What I am trying to do is convert the .AVI videos(which is how they are created on the truck) to .WMV in my C# code using Windows Media Encoder. I have a virtual directory to the truck location of the videos. I also have a virtual directory created to the Linux box. The application resides on a Windows Server 2003 and I am using VS 2005, .NET framework 2.0. The method calling the conversion function uses impersonation and all virtual directories are set up to connect with the impersonated user. When I use the application to copy the videos without converting, it works perfectly. When I try to implement the conversion code I receive the following error:

Attempted to read or write protected memory. This is often an indication that other memory has been corrupted

The line that fails is: m_Encoder.PrepareToEncode(true);

I have been Googling this error for days now and have found few solutions. I have tried some of the solutions I did manage to find, but nothing has helped. I'm thinking it's a permissions issue, but I can't figure out what! Any help would be greatly appreciated and please let me know if you need any more information. I am totally new to WME so I could even be doing this all wrong!

Thanks in Advance,

Carmen

 

Here is the code I'm using for the conversion and then the method where I am calling the ConvertFile function:

private static string ConvertFile(string mediaFile)
       {            
           UtilDaoOracle oraDao = new UtilDaoOracle();
           oraDao.LogError(mediaFile, "ConvertFile", 500321);

           WMEncoder m_Encoder = new WMEncoder();
           
           IWMEncSourceGroup SrcGrp = (IWMEncSourceGroup)m_Encoder.SourceGroupCollection.Add("SG_1");
           IWMEncVideoSource SrcVid = (IWMEncVideoSource)SrcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_VIDEO);


           SrcVid.SetInput(mediaFile, "", "");

           const string ProfileName = "Screen Video Medium (CBR)";
          
           foreach (IWMEncProfile aProfile in m_Encoder.ProfileCollection)
           {
               if (aProfile.Name == ProfileName)
               {
                   SrcGrp.set_Profile(aProfile);
                   oraDao.LogError(aProfile.Name.ToString(), "ConvertFileLoop", 500321);
                   break;
               }
           }

           
           m_Encoder.File.LocalFileName = Regex.Replace(mediaFile, ".avi", ".wmv");
           oraDao.LogError(m_Encoder.File.LocalFileName, "ConvertFileREturn", 500321);

           m_Encoder.AutoStop = true;

           try
           {
               m_Encoder.PrepareToEncode(true);
           }
           catch (Exception exp)
           {
               oraDao.LogError(exp.Message, "Preparetoencode", 500321);
               m_Encoder.Flush();
           }

           try
           {
               m_Encoder.Start();
           }
           catch (Exception exp)
           {
               oraDao.LogError(exp.Message, "encoderstart", 500321);
               m_Encoder.Flush();
           }

           return m_Encoder.File.LocalFileName;

       }

 

private static bool CopyFile(string srcDir, string destDir, string fileName, bool ignoreIfInParentDir)
       {
           
           UtilDaoOracle oraDao = new UtilDaoOracle();
           FileInfo destFile = new FileInfo(CombinePath(destDir, fileName));

           //Only copy if the file does not already exist.
           if (!destFile.Exists)
           {
               if (ignoreIfInParentDir && File.Exists(CombinePath(destFile.Directory.Parent.FullName, fileName)))
               {
                   // Return if the files already exists in the parent directory.
                   return false;
               }

               FileInfo srcFile = new FileInfo(CombinePath(srcDir, fileName));
               if (srcFile.Exists)
               {
                   // Create the destination directory if not there already.
                   if (!destFile.Directory.Exists)
                   {
                       destFile.Directory.Create();
                   }

                   if (srcFile.Extension == ".avi")
                   {
                       string convertedFile = ConvertFile(srcFile.ToString());
                       FileInfo convertedFileDone = new FileInfo(convertedFile);
                       convertedFileDone.CopyTo(destFile.FullName);                        
                   }
                   else
                   {
                       srcFile.CopyTo(destFile.FullName);
                   }
                   
                   return true;
               }
               else
               {
                   Logger.LogWarning(string.Format("Source file not found on machine: {0}", srcFile.FullName));
               }
           }
           return false;
       }

[PlausiblyDamp]

If you copy the file locally and try the convert does it work then?

[clinnebur]

Thank you for responding! Yes, I have taken the ConvertFile code and made a stand-alone web app, and passed it in an AVI file on the local C drive and wrote the WMV back to the local C drive and it works perfectly (this is still on the Server 2003). It's just when I try to use it in the app with the impersonation and virtual directories that I'm getting the error. That's why I'm thinking permissions, but I could be wrong....

[PlausiblyDamp]

Can you create a file under the virtual directory direct from code?

[clinnebur]

Good question! I had not thought to do that. If I use the little stand-alone web app and pass it in a file on the virtual directory ("\\server\drive\directory\filename.avi") I receive this error on the SrcVid.SetInput line of code:

 

0xC00D002B

 

By Googling this error code, it seems like this translates to:

 

NS_E_INVALID_REQUEST

 

Does this help? I will try and see if I can come up with any hits on this new error.