/// <summary>
/// Get next audio/video frame from input
/// </summary>
/// <returns>Frame buffer for next audio and video frame. NULL if end of file</returns>
public FrameBuffer NextFrame()
{
frame.SampleTime = (long)(timestampSec * TICKS_PER_SECOND);
bool haveVideoBuffer = false;
bool haveAudioBuffer;
if (videoFrameReader != null && videoFrameReader.Read())
{
frame.VideoBuffer = videoFrameReader.GetFrame();
haveVideoBuffer = (frame.VideoBuffer != null);
}
haveAudioBuffer = wavFile.NextSample(frame.AudioBuffer);
timestampSec += frameDurationSec;
return((haveVideoBuffer || haveAudioBuffer) ? frame : null);
}
public static Bitmap GetFrame(string videoPath, double frameTime)
{
using (var videoFrameReader = new VideoFrameReader(videoPath))
{
if (frameTime > 0)
{
videoFrameReader.Seek(frameTime);
}
//videoFrameReader.SetFrameWidth(300);
if (videoFrameReader.Read())
{
return(videoFrameReader.GetFrame());
}
return(GetErrorFrame(videoFrameReader.Width, videoFrameReader.Height, "Reading frame failed"));
}
}
private void ExtractThumbnails()
{
try
{
foreach (Content content in _contents)
{
#region if
if (content.Extension == ".avi" || content.Extension == ".mov" || content.Extension == ".mp4" || content.Extension == ".wmv" || content.Extension == ".mpg" ||
content.Extension == ".mpeg")
{
string previewFrameDirectory = _previewFramesPath + content.SubDir + "\\";
if (!Directory.Exists(previewFrameDirectory))
{
Directory.CreateDirectory(previewFrameDirectory);
}
using (VideoFrameReader vfr = new VideoFrameReader(_filePath + content.FileName))
{
int noFrames = vfr.NumberOfFrames;
// save a thumbnail for the first frame for the "My Content" panel
int firstFrameIndex;
if (noFrames < 50)
{
firstFrameIndex = 0;
}
if (noFrames < 200)
{
firstFrameIndex = 50;
}
else
{
firstFrameIndex = 200;
}
using (Bitmap firstFrame = vfr.GetFrame(firstFrameIndex))
{
int height = (int)((float)_thumbnailWidth * ((float)firstFrame.Height / (float)firstFrame.Width));
using (Bitmap thumbnail = new Bitmap(_thumbnailWidth, height))
{
using (Graphics g = Graphics.FromImage(thumbnail))
{
g.DrawImage(firstFrame, 0, 0, _thumbnailWidth, height);
}
thumbnail.Save(_thumbnailPath + content.SubDir + "\\" + content.FileNameWithoutExtension + ".jpg");
}
}
int frameCount = 1;
int space = noFrames / _targetNoFrames;
for (int frameNumber = 0; frameNumber < vfr.NumberOfFrames; frameNumber = frameNumber + space)
{
using (Bitmap frame = vfr.GetFrame(frameNumber))
{
ImageUtilities.SaveImage(frame, previewFrameDirectory + content.FileNameWithoutExtension + frameCount + ".jpg", _quality);
}
frameCount++;
}
}
}
#endregion
}
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
}
