WMEncoder throws OutOfMemoryException after one iteration

Question

I'm using WMEncoder for screen recording.
At the first time everything is working properly,
but at the second time Start() method throws me OutOfMemoryException:

System.OutOfMemoryException was caught
  HResult=-2147024882
  Message=Not enough storage is available to complete this operation.

My code looks like this and it's on .Net4:

// Initialize encoder and set recording parameters
mEncoder = new WMEncoder();
SetRecordingParams(); // If it's relevant I can attach this function

// Set the output file.
mEncoder.EnableAutoArchive = true;
mEncoder.AutoIndex = true;
mEncoder.File.LocalFileName = tempRecFile;

// Start the encoding process.
mEncoder.PrepareToEncode(true);
mEncoder.Start();

// If currently recording, stop recording
if (mEncoder != null &&
    mEncoder.RunState != WMENC_ENCODER_STATE.WMENC_ENCODER_STOPPED)
{

    // Stop recording
    mEncoder.Stop();
}

// Releasing Com object
if (mEncoder != null)
{
    Marshal.FinalReleaseComObject(mEncoder);
    mEncoder = null;
}

Help me!

UPDATE

 private void SetRecordingParams()
        {
            // Create a source group collection object from the WMEncoder object.
            srcGrpColl = mEncoder.SourceGroupCollection;

            // Add a source group named SG1 to the collection.
            // Create a source object for each type of multimedia content
            // in the source group.
            srcGrp = (IWMEncSourceGroup2)srcGrpColl.Add("SG_1");
            srcVideo = (IWMEncVideoSource2)srcGrp.AddSource(WMENC_SOURCE_TYPE.WMENC_VIDEO);
            srcVideo.SetInput("ScreenCap://ScreenCapture1", "", "");

            // Create a profile collection object from the WMEncoder object.
            mEncoder.ProfileCollection.ProfileDirectory = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
            mEncoder.ProfileCollection.Refresh();
            proColl = mEncoder.ProfileCollection;

            // Create a profile object
            IEnumerator profEnum = proColl.GetEnumerator();
            while (profEnum.MoveNext())
            {
                profile = (IWMEncProfile)profEnum.Current;
                if (profile.Name == "Screen Recording")
                {
                    // Load profile
                    newProfile = new WMEncProfile2();
                    newProfile.LoadFromIWMProfile(profile);

                    audience = newProfile.get_Audience(0);

                    audience.set_VideoFPS(0, paramMaps.fpsMapping[fpsKey] * 1000);
                    audience.set_VideoKeyFrameDistance(0, keyFrameInt * 1000);
                    audience.set_VideoWidth(0, Screen.PrimaryScreen.Bounds.Width * paramMaps.imageQualityMapping[qualityRatioKey] / 100);
                    audience.set_VideoHeight(0, Screen.PrimaryScreen.Bounds.Height * paramMaps.imageQualityMapping[qualityRatioKey] / 100);

                    // Set profile language to client machine's locale.
                    // When recording is done this way, it will assume server's locale when extracted from the DB.
                    // This enables us to know which locale should be used for the file merge.
                    // We have found that when profile is set to the same language as user's locale, the recording
                    // has a "flexible" language definition.
                    int langCount = newProfile.get_LanguageCount(WMENC_SOURCE_TYPE.WMENC_VIDEO, 0);
                    // Remove all existing language definitions from profile
                    for (int i = 0; i < langCount; i++)
                    {
                        newProfile.RemoveLanguage(WMENC_SOURCE_TYPE.WMENC_VIDEO, 0, newProfile.get_Language(WMENC_SOURCE_TYPE.WMENC_VIDEO, 0, i));
                    }
                    // Add current locale as profile language.
                    int lcid = Thread.CurrentThread.CurrentCulture.LCID;
                    newProfile.AddLanguage(WMENC_SOURCE_TYPE.WMENC_VIDEO, 0, lcid);

                    // Specify this profile object as the profile to use in source group.
                    srcGrp.set_Profile(newProfile);
                }
            }
            mEncoder.VideoComplexity = WMENC_VIDEOCOMPLEXITY.WMENC_COMPLEXITY_LEVEL20;
        }

Answer 1

WMEncoder is no longer supported by Microsoft apparently. I would recommend looking into the Expression Encoder which make screen capture very easy indeed - http://www.microsoft.com/expression/products/Encoder4_Overview.aspx. And it saves you the hassle of marshalling and dealing with COM.