Replaying and Decoding cannot be executed at the same time.
Also, when using the Conversion Tool, other conversion process
cannot be executed. (Data can be played when using a tool other
than the Decoder. But remember that doing those process at
the same time decreases the performance.)
View drawing
It may take a while before the view drawing starts when playing
begins. This is not a bug. It takes time especially after down sampling.
No FF/REW for layer-I
Since the layer-I seeking is unstable, I didn't include this feature
in SCMPX.