void CreateVideoStream(int Width, int Height)
{
// Select encoder type based on FOURCC of codec
if (_codec == AviCodec.Uncompressed)
{
_videoStream = _writer.AddUncompressedVideoStream(Width, Height);
}
else if (_codec == AviCodec.MotionJpeg)
{
_videoStream = _writer.AddMotionJpegVideoStream(Width, Height, _codec.Quality);
}
else
{
_videoStream = _writer.AddMpeg4VideoStream(Width, Height,
(double)_writer.FramesPerSecond,
// It seems that all tested MPEG-4 VfW codecs ignore the quality affecting parameters passed through VfW API
// They only respect the settings from their own configuration dialogs, and Mpeg4VideoEncoder currently has no support for this
0,
_codec.Quality,
// Most of VfW codecs expect single-threaded use, so we wrap this encoder to special wrapper
// Thus all calls to the encoder (including its instantiation) will be invoked on a single thread although encoding (and writing) is performed asynchronously
_codec.FourCC,
true);
}
_videoStream.Name = "ScrenaVideo";
}
private void CreateVideoStream(int width, int height)
{
// Select encoder type based on FOURCC of codec
if (_codec == AviCodec.Uncompressed)
{
_videoStream = _writer.AddUncompressedVideoStream(width, height);
}
else if (_codec == AviCodec.MotionJpeg)
{
// MotionJpegVideoStream implementation allocates multiple WriteableBitmap for every thread
// Use SingleThreadWrapper to reduce allocation
var encoderFactory = new Func <IVideoEncoder>(() => new MotionJpegVideoEncoderWpf(width, height, _codec.Quality));
var encoder = new SingleThreadedVideoEncoderWrapper(encoderFactory);
_videoStream = _writer.AddEncodingVideoStream(encoder, true, width, height);
}
else
{
_videoStream = _writer.AddMpeg4VideoStream(width, height,
(double)_writer.FramesPerSecond,
// It seems that all tested MPEG-4 VfW codecs ignore the quality affecting parameters passed through VfW API
// They only respect the settings from their own configuration dialogs, and Mpeg4VideoEncoder currently has no support for this
0,
_codec.Quality,
// Most of VfW codecs expect single-threaded use, so we wrap this encoder to special wrapper
// Thus all calls to the encoder (including its instantiation) will be invoked on a single thread although encoding (and writing) is performed asynchronously
_codec.FourCC,
true);
}
_videoStream.Name = "Video";
}
