No problem, if you switch to WPF. Not a problem at all. Some background: WPF, as well as video, is based on DirectX, where everything can be superimposed on everything and be transparent or not.
What if you want to stay with
System.Windows.Forms and still work with both video and transparency… it's hard to imaging worse decision. It is possible, but very difficult. The whole nature of Forms, which is based on Windows API and GDI+ works against it. Do you want problems which probably won't worth the effort? You could use DirectX on low level. To put a semi-transparent image over video, you will have to use so called overlay manager. GDI+ resists…
So, the real, not overly perverted solution is WPF. The player is available:
System.Windows.Media.MediaPlayer:
http://msdn.microsoft.com/en-us/library/system.windows.media.mediaplayer.aspx[
^].
VCL as the broadcast software still can be used. As the control? I don't know exactly, really. At least some part of this software can be used, I'm sure, starting from the fact the it's based on ffMpeg/libavcodec; frankly, Windows Media Player feature set looks simply ridiculous next to ffMpeg/libavcodec…
—SA
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