V210 issue fix + correct packing

internal/flowdef/flowdef.go

@@ -132,8 +132,8 @@ func (v Video) Validate() error {
 	if v.ColorSpace != ColorSpaceBT709 {
 		return fmt.Errorf("colorspace must be %q, got %q", ColorSpaceBT709, v.ColorSpace)
 	}
-	if v.FrameWidth == 0 || v.FrameWidth%6 != 0 {
-		return fmt.Errorf("frame_width must be greater than zero and divisible by 6, got %d", v.FrameWidth)
+	if v.FrameWidth == 0 || v.FrameWidth%2 != 0 {
+		return fmt.Errorf("frame_width must be greater than zero and even for 4:2:2 video, got %d", v.FrameWidth)
 	}
 	if v.FrameHeight == 0 {
 		return fmt.Errorf("frame_height must be greater than zero")