void generatePreview(MediaFileItem item)
{
ItemProgressMax = 100;
ItemProgress = 0;
ItemInfo = "Creating video preview image for: " + System.IO.Path.GetFileName(item.Location);
FileStream outputFile = null;
RenderTargetBitmap bitmap = null;
mediaProbe.open(item.Location, CancellationToken);
try
{
int nrFrames = 0;
if (asyncState.IsCaptureIntervalSecondsEnabled == false)
{
nrFrames = asyncState.NrRows * asyncState.NrColumns;
}
else
{
nrFrames = mediaProbe.DurationSeconds / asyncState.CaptureIntervalSeconds;
nrFrames = calcNrRowsNrColumns(nrFrames);
}
int thumbWidth = asyncState.MaxPreviewImageWidth / asyncState.NrColumns;
ItemProgressMax = nrFrames;
double captureIntervalSeconds = asyncState.IsCaptureIntervalSecondsEnabled ? asyncState.CaptureIntervalSeconds : 0;
List <MediaThumb> thumbs = mediaProbe.grabThumbnails(thumbWidth, 0, captureIntervalSeconds
, nrFrames, 0.01, CancellationToken, 0, grabThumbnails_UpdateProgressCallback);
if (thumbs.Count == 0 || CancellationToken.IsCancellationRequested)
{
return;
}
nrFrames = Math.Min(thumbs.Count, nrFrames);
if (asyncState.IsCaptureIntervalSecondsEnabled == true)
{
nrFrames = calcNrRowsNrColumns(nrFrames);
}
JpegBitmapEncoder encoder = new JpegBitmapEncoder();
BitmapMetadata metaData = new BitmapMetadata("jpg");
metaData.ApplicationName = App.getAppInfoString();
metaData.DateTaken = DateTime.Now.ToString("R");
if (item.Metadata.Tags.Count > 0)
{
List <String> tags = new List <string>();
foreach (Tag tag in item.Metadata.Tags)
{
tags.Add(tag.Name);
}
metaData.Keywords = new ReadOnlyCollection <string>(tags);
}
if (item.Metadata.Title != null)
{
metaData.Title = item.Metadata.Title;
}
if (item.Metadata.Copyright != null)
{
metaData.Copyright = item.Metadata.Copyright;
}
if (item.Metadata.Description != null)
{
metaData.Subject = item.Metadata.Description;
}
if (item.Metadata.Author != null)
{
List <String> author = new List <string>();
author.Add(item.Metadata.Author);
metaData.Author = new ReadOnlyCollection <string>(author);
}
if (item.Metadata.Rating != null)
{
metaData.Rating = (int)item.Metadata.Rating.Value;
}
// rendertargetbitmap has to be executed on the UI thread
// if it's run on a non-UI thread there will be a memory leak
App.Current.Dispatcher.Invoke(() =>
{
VideoGridImage gridImage = new VideoGridImage(item.Metadata as VideoMetadata, asyncState, thumbs);
bitmap = gridImage.createGridImage(asyncState.MaxPreviewImageWidth);
});
BitmapFrame frame = BitmapFrame.Create(bitmap, null, metaData, null);
encoder.Frames.Add(frame);
String outputFileName = Path.GetFileNameWithoutExtension(item.Location) + ".jpg";
outputFile = new FileStream(asyncState.OutputPath + "/" + outputFileName, FileMode.Create);
encoder.QualityLevel = asyncState.JpegQuality;
encoder.Save(outputFile);
ItemProgressMax = nrFrames;
ItemProgress = nrFrames;
InfoMessages.Add("Finished video preview image: " + asyncState.OutputPath + "/" + outputFileName);
}
catch (Exception e)
{
InfoMessages.Add("Error creating video preview image for: " + item.Location + " " + e.Message);
Logger.Log.Error("Error creating preview image for: " + item.Location, e);
}
finally
{
if (bitmap != null)
{
bitmap.Clear();
bitmap = null;
}
if (outputFile != null)
{
outputFile.Close();
outputFile.Dispose();
}
mediaProbe.close();
// because of the extreme amount of memory used by rendertargetbitmap
// make sure we have it all back before moving on to prevent out of memory spikes
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
}
}
void generatePreview(MediaFileItem item)
{
ItemProgressMax = 100;
ItemProgress = 0;
ItemInfo = "Creating video preview image for: " + System.IO.Path.GetFileName(item.Location);
FileStream outputFile = null;
RenderTargetBitmap bitmap = null;
mediaProbe.open(item.Location, CancellationToken);
try
{
int nrFrames = 0;
if (asyncState.IsCaptureIntervalSecondsEnabled == false)
{
nrFrames = asyncState.NrRows * asyncState.NrColumns;
}
else
{
nrFrames = mediaProbe.DurationSeconds / asyncState.CaptureIntervalSeconds;
nrFrames = calcNrRowsNrColumns(nrFrames);
}
int thumbWidth = asyncState.MaxPreviewImageWidth / asyncState.NrColumns;
ItemProgressMax = nrFrames;
double captureIntervalSeconds = asyncState.IsCaptureIntervalSecondsEnabled ? asyncState.CaptureIntervalSeconds : 0;
List<MediaThumb> thumbs = mediaProbe.grabThumbnails(thumbWidth, 0, captureIntervalSeconds
,nrFrames, 0.01, CancellationToken, 0, grabThumbnails_UpdateProgressCallback);
if (thumbs.Count == 0 || CancellationToken.IsCancellationRequested) return;
nrFrames = Math.Min(thumbs.Count, nrFrames);
if (asyncState.IsCaptureIntervalSecondsEnabled == true)
{
nrFrames = calcNrRowsNrColumns(nrFrames);
}
JpegBitmapEncoder encoder = new JpegBitmapEncoder();
BitmapMetadata metaData = new BitmapMetadata("jpg");
metaData.ApplicationName = App.getAppInfoString();
metaData.DateTaken = DateTime.Now.ToString("R");
if (item.Metadata.Tags.Count > 0)
{
List<String> tags = new List<string>();
foreach (Tag tag in item.Metadata.Tags)
{
tags.Add(tag.Name);
}
metaData.Keywords = new ReadOnlyCollection<string>(tags);
}
if (item.Metadata.Title != null)
{
metaData.Title = item.Metadata.Title;
}
if (item.Metadata.Copyright != null)
{
metaData.Copyright = item.Metadata.Copyright;
}
if (item.Metadata.Description != null)
{
metaData.Subject = item.Metadata.Description;
}
if (item.Metadata.Author != null)
{
List<String> author = new List<string>();
author.Add(item.Metadata.Author);
metaData.Author = new ReadOnlyCollection<string>(author);
}
if (item.Metadata.Rating != null)
{
metaData.Rating = (int)item.Metadata.Rating.Value;
}
// rendertargetbitmap has to be executed on the UI thread
// if it's run on a non-UI thread there will be a memory leak
App.Current.Dispatcher.Invoke(() =>
{
VideoGridImage gridImage = new VideoGridImage(item.Metadata as VideoMetadata, asyncState, thumbs);
bitmap = gridImage.createGridImage(asyncState.MaxPreviewImageWidth);
});
BitmapFrame frame = BitmapFrame.Create(bitmap, null, metaData, null);
encoder.Frames.Add(frame);
String outputFileName = Path.GetFileNameWithoutExtension(item.Location) + ".jpg";
outputFile = new FileStream(asyncState.OutputPath + "/" + outputFileName, FileMode.Create);
encoder.QualityLevel = asyncState.JpegQuality;
encoder.Save(outputFile);
ItemProgressMax = nrFrames;
ItemProgress = nrFrames;
InfoMessages.Add("Finished video preview image: " + asyncState.OutputPath + "/" + outputFileName);
}
catch (Exception e)
{
InfoMessages.Add("Error creating video preview image for: " + item.Location + " " + e.Message);
Logger.Log.Error("Error creating preview image for: " + item.Location, e);
}
finally
{
if (bitmap != null)
{
bitmap.Clear();
bitmap = null;
}
if (outputFile != null)
{
outputFile.Close();
outputFile.Dispose();
}
mediaProbe.close();
// because of the extreme amount of memory used by rendertargetbitmap
// make sure we have it all back before moving on to prevent out of memory spikes
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
}
}
