private void bgWorkerSave_DoWork(object sender, DoWorkEventArgs e)
{
Thread.CurrentThread.Name = "Saving";
BackgroundWorker bgWorker = sender as BackgroundWorker;
if (!(e.Argument is SavingSettings))
{
saveResult = SaveResult.UnknownError;
e.Result = 0;
return;
}
SavingSettings settings = (SavingSettings)e.Argument;
if (settings.ImageRetriever == null || settings.InputFrameInterval < 0 || bgWorker == null)
{
saveResult = SaveResult.UnknownError;
e.Result = 0;
return;
}
try
{
log.DebugFormat("Saving selection [{0}]->[{1}] to: {2}", settings.Section.Start, settings.Section.End, Path.GetFileName(settings.File));
// TODO it may actually make more sense to split the saving methods for regular
// save, paused video and diaporama. It will cause inevitable code duplication but better encapsulation and simpler algo.
// When each save method has its own class and UI panel, it will be a better design.
if (!settings.PausedVideo)
{
// Take special care for slowmotion, the frame interval can not go down indefinitely.
// Use frame duplication when under 8fps.
settings.Duplication = (int)Math.Ceiling(settings.InputFrameInterval / 125.0);
settings.KeyframeDuplication = settings.Duplication;
settings.OutputFrameInterval = settings.InputFrameInterval / settings.Duplication;
if (settings.KeyframesOnly)
{
settings.EstimatedTotal = metadata.Count * settings.Duplication;
}
else
{
settings.EstimatedTotal = videoReader.EstimatedFrames * settings.Duplication;
}
}
else
{
// For paused video, slow motion is not supported.
// InputFrameInterval will have been set to a multiple of the original frame interval.
settings.Duplication = 1;
settings.KeyframeDuplication = (int)(settings.InputFrameInterval / metadata.UserInterval);
settings.OutputFrameInterval = metadata.UserInterval;
long regularFramesTotal = videoReader.EstimatedFrames - metadata.Count;
long keyframesTotal = metadata.Count * settings.KeyframeDuplication;
settings.EstimatedTotal = regularFramesTotal + keyframesTotal;
}
log.DebugFormat("interval:{0}, duplication:{1}, kf duplication:{2}", settings.OutputFrameInterval, settings.Duplication, settings.KeyframeDuplication);
videoReader.BeforeFrameEnumeration();
IEnumerable <Bitmap> images = EnumerateImages(settings);
VideoFileWriter w = new VideoFileWriter();
string formatString = FilenameHelper.GetFormatString(settings.File);
saveResult = w.Save(settings, videoReader.Info, formatString, images, bgWorker);
videoReader.AfterFrameEnumeration();
}
catch (Exception exp)
{
saveResult = SaveResult.UnknownError;
log.Error("Unknown error while saving video.");
log.Error(exp.StackTrace);
}
e.Result = 0;
}