Streaming System.Drawing.Bitmap with PixelFormat.Format32bppArgb

[paulomorgado]

Hi,

I'm trying to stream a System.Drawing.Bitmap and I copied most of VideoTestPatternSource:

public static byte[] ConvertBitmapToBGRA(Bitmap bitmap)
{
    int width = bitmap.Width;
    int height = bitmap.Height;
    int stride = width * 4; // 4 bytes per pixel for BGRA
    byte[] bgraData = new byte[stride * height];

    BitmapData bmpData = bitmap.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
    if (bmpData == null)
    {
        throw new InvalidOperationException("Failed to lock bitmap data.");
    }

    IntPtr ptr = bmpData.Scan0;
    Marshal.Copy(ptr, bgraData, 0, bgraData.Length);
    bitmap.UnlockBits(bmpData);

    return bgraData;
}

//..
onVideoSourceRawSample((uint)_frameSpacing, bitmap.Width, bitmap.Height, ConvertBitmapToBGRA()bitmap, VideoPixelFormatsEnum.Bgra);

But I'm getting this:

instead of this:

What am I doing wrong?

[paulomorgado]

It doesn't seem to be very consistent.

Now I'm getting the right colors.

[sipsorcery]

Most likely due to occasional lost key or reference frames (most likely a reference frame as losing a key frame would corrupt the whole image).

There are RTCP mechanisms to request the sender to retransmit crtical video frames but they have not been implemented to any great extent in this library as of yet.

[paulomorgado]

That's odd.

I using a Bitmap. It's a different image each time, but it's a complete image.

But some times the colors are OK, some times aren't.

Could it be due to the I420A conversion?

[paulomorgado]

It was the I420 conversion and it was my own fault.

But I'm still experiencing resolution issues:

SIPSorcery:

MixedReality:

The source is the exact same stream of Bitmap, except that MixedReality does not have any I420 conversion (unless it's inside it).

What am I missing here?