2.2.4.2.1.3 RFX_PROGRESSIVE_FRAME_END
The RFX_PROGRESSIVE_FRAME_END structure marks the end of the frame in the codec payload. This block SHOULD appear only once, after the final RFX_PROGRESSIVE_REGION (section 2.2.4.2.1.5) block. If this block appears more than once, the decoder SHOULD ignore the other occurrences.
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blockType (2 bytes): A 16-bit unsigned integer that specifies the block type. This field MUST be set to WBT_FRAME_END (0xCCC2).
blockLen (4 bytes): A 32-bit unsigned integer that specifies the size, in bytes, of the RFX_PROGRESSIVE_FRAME_END block. This field MUST be set to 0x00000006.