Microsoft Expression Encoder。 ScreenCapture
我注意到Exression Encoder 4屏幕录制有时比指定的短。例如。 5分钟的录音仅产生15秒的视频。这似乎与视频同时捕获的音频有关。最初我使用耳机扬声器作为音频配置文件。当我从录制中删除捕获的音频时，问题就停止了。当我将音频配置文件更改为标准扬声器时，它也会停止。但是，当录制开始时，我可以通过快速改变音量来轻松地重现它。结果是录音冻结了......录音还需要5分钟;但结果是15秒（左右）的视频。
代码段如下所示。
try
{
_screenCaptureJob = new ScreenCaptureJob();
_screenCaptureJob.CaptureRectangle = _screenRectangle;
_screenCaptureJob.ShowFlashingBoundary = true;
_screenCaptureJob.ScreenCaptureVideoProfile.FrameRate = 20;
_screenCaptureJob.CaptureMouseCursor = false;
_screenCaptureJob.ScreenCaptureCommandFinished += new EventHandler<ScreenCaptureCommandFinishedEventArgs>(_screenCaptureJob_ScreenCaptureCommandFinished);
_screenCaptureJob.ScreenCaptureFinished += new EventHandler<ScreenCaptureEventArgs>(_screenCaptureJob_ScreenCaptureFinished);
Collection<EncoderDevice> audioDevices = EncoderDevices.FindDevices(EncoderDeviceType.Audio);
try
{
EncoderDevice foundDevice = audioDevices.First(delegate(EncoderDevice item) { return item.Name.StartsWith(@"Speakers"); });
_screenCaptureJob.AddAudioDeviceSource(foundDevice);
}
catch (Exception ex)
{
_appLogger.Error(string.Format("RecordNextSegment. Cannot find prefered audio device using {0} !", audioDevices[0].Name), ex);
_screenCaptureJob.AddAudioDeviceSource(audioDevices[0]);
}
_currentDurationInSeconds = (_recordDurationInSeconds < _maxSegmentDurationInSeconds) ? _recordDurationInSeconds : _maxSegmentDurationInSeconds;
_screenCaptureJob.Duration = DateTimeUtilities.DurationToTimeSpan(_currentDurationInSeconds);
_screenCaptureJob.OutputScreenCaptureFileName = string.Format(@"{0}{1}.wmv", _tvaConfiguration.TVAVideoDirectoryRawVideo, FileNameFromSegment(_segmentNumber ));
_screenCaptureJob.Start();
LogInfo(string.Format("Remaining time (seconds): {0}. Current time: {1}. File: {2}", _recordDurationInSeconds, _currentDurationInSeconds, _screenCaptureJob.OutputScreenCaptureFileName));
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