MediaPlayer coding question

[William Johnston]

Hi,

I modified a thumbnail creation app and get black images since the first second is black as well.

My questions are:

1. How do I set the MediaPlayer.Clo ck property to start screen capture at two seconds?
2. How do I open a file without using a URI?

Here's the sample code:

private void CreateThumbnail (string file, string outputDir)
{
try
{

Uri uri = new Uri(file);

MediaPlayer mp = new MediaPlayer();
mp.Open(uri);
//mp.Position = new TimeSpan(00, 00, 02);
mp.Clock = new MediaTimeline(n ew TimeSpan(00, 00, 02)).CreateCloc k();
RenderTargetBit map rtb = new RenderTargetBit map(320, 240, 1 / 200, 1 / 200, PixelFormats.Pb gra32);
DrawingVisual dv = new DrawingVisual() ;
DrawingContext dc = dv.RenderOpen() ;
// RectAnimation ra = new RectAnimation() ;
// ra.BeginTime = new TimeSpan(00, 00, 02);
// dc.DrawVideo(mp , new Rect(0, 0, 320, 240), ra.CreateClock( ));
dc.DrawVideo(mp , new Rect(0, 0, 320, 240));

dc.Close();
rtb.Render(dv);
//Image im = new Image();
//im.Source = BitmapFrame.Cre ate(rtb);

string filename = GetFileName(fil e);

//create the output filename
object[] formatParams = new object[2];
formatParams[0] = outputDir;
formatParams[1] = filename;

string outputFileName = null;

outputFileName = string.Format(" {0}\\tn_{1}.bmp ", formatParams);

BmpBitmapEncode r encoder = new BmpBitmapEncode r();
encoder.Frames. Add(BitmapFrame .Create(rtb));

using (FileStream writer = new FileStream(outp utFileName, FileMode.Create ))
{
System.Console. WriteLine("Savi ng [{0}]", outputFileName) ;
encoder.Save(wr iter);
}
}
catch (Exception e)
{
System.Console. WriteLine("Crea teThumbnail: " + e.Message);
System.Environm ent.Exit(1);
}
}

Any suggestions?

Thanks,
William Johnston

[William Johnston]

Re: MediaPlayer coding question

"William Johnston" <williamj@tenba se2.comwrote:

>

Still getting black thumbnails after setting BeginTime for MediaTimeLine object.

Here is my modifed thumbnail creator code:

private void CreateThumbnail (string file, string outputDir)
{
try
{
MediaPlayer mp = new MediaPlayer();

MediaTimeline mt = new MediaTimeline(n ew Uri(file));
mt.BeginTime = new TimeSpan(00, 00, 02);
MediaClock mc = mt.CreateClock( );

string beginTime = null;

if (debug)
{
beginTime = mc.Timeline.Beg inTime.ToString ();
System.Console. WriteLine("begi nTime: [" + beginTime + "]");
}

mp.Clock = mt.CreateClock( );

if (debug)
{
beginTime = mp.Clock.Timeli ne.BeginTime.To String();
System.Console. WriteLine("begi nTime: [" + beginTime + "]");
}

RenderTargetBit map rtb = new RenderTargetBit map(130, 92, 1 / 200, 1 / 200, PixelFormats.Pb gra32);
DrawingVisual dv = new DrawingVisual() ;
DrawingContext dc = dv.RenderOpen() ;
RectAnimation ra = new RectAnimation() ;
dc.DrawVideo(mp , new Rect(0, 0, 130, 92));

dc.Close();
rtb.Render(dv);

string filename = GetFileName(fil e);

//create the output filename
object[] formatParams = new object[2];
formatParams[0] = outputDir;
formatParams[1] = filename;

string outputFileName = null;

outputFileName = string.Format(" {0}\\tn_{1}.bmp ", formatParams);

BmpBitmapEncode r encoder = new BmpBitmapEncode r();
encoder.Frames. Add(BitmapFrame .Create(rtb));

using (FileStream writer = new FileStream(outp utFileName, FileMode.Create ))
{
System.Console. WriteLine("Savi ng [{0}]", outputFileName) ;
encoder.Save(wr iter);
}
}
catch (Exception e)
{
System.Console. WriteLine("Crea teThumbnail: " + e.Message);
System.Environm ent.Exit(1);
}
}

Thanks,
William Johnston