#define BLOCK_FLAG_HEADER 0x0020
/** This is the last block of the frame */
#define BLOCK_FLAG_END_OF_FRAME 0x0040
+/** No keyframes present */
+#define BLOCK_FLAG_NO_KEYFRAME 0x0080
#define BLOCK_FLAG_PRIVATE_MASK 0xffff0000
#define BLOCK_FLAG_PRIVATE_SHIFT 16