Add control for video subsampling

Add '-s' to assign jpeg subsampling.
  0: 444, 1: 420

Using 420 will make video lack of detail compared to 444, but cut
amount of video data by half. This could be useful for some cases.

Change-Id: I48836a7117f7e3b9986e3f5c6a92974c9268525e
Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com>
diff --git a/ikvm_manager.cpp b/ikvm_manager.cpp
index d56110d..33e7b17 100644
--- a/ikvm_manager.cpp
+++ b/ikvm_manager.cpp
@@ -8,7 +8,7 @@
 Manager::Manager(const Args& args) :
     continueExecuting(true), serverDone(false), videoDone(true),
     input(args.getKeyboardPath(), args.getPointerPath()),
-    video(args.getVideoPath(), input, args.getFrameRate()),
+    video(args.getVideoPath(), input, args.getFrameRate(), args.getSubsampling()),
     server(args, input, video)
 {
 }