Microsoft Expression Encoder。ScreenCapture

Question

我注意到Exression 4的屏幕记录有时会比指定的短。例如，5分钟的录制只产生15秒的视频。这似乎与音频与视频同时被捕获有关。最初，我使用耳机扬声器作为音频配置文件。当我从我的录音中删除捕获音频时，问题就停止了。当我将音频配置文件更改为标准扬声器时，它也停止了。然而，当录制开始时，我可以通过快速改变音量来轻松地重现它。结果就是录音冻结了。它仍然需要5分钟来记录；但结果只有15秒(大约)的视频。

代码片段如下所示。

        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));

Answer 1

不确定，关于解决问题的方法，但想给你一些关于音频问题的输入。在这两台机器上，我测试了我的应用程序、屏幕截图以及音频的完美工作。因此，我只能得出结论，它可能与您的硬件有关，或者您的代码有问题……(也许可以通过它进行调试?)

此外，您的解决方案可能与this.相同