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HEVC bit stream: the standard HEVC headers (the VPS and SPS NALs)
give an overhead of about 60 bytes for no added value in the case of
picture compression. Since the alpha plane uses a different HEVC bit
stream, it also adds the same overhead again. So we removed the VPS
and SPS NALs and added a very small header with the equivalent
information (typically 4 bytes). We also removed the first NAL start
code which is not useful. It is still possible to reconstruct a
standard HEVC stream to feed an unmodified hardware decoder if needed.
作者是这样说的，但也没搞个reconstruct的程序，略坑啊。
give an overhead of about 60 bytes for no added value in the case of
picture compression. Since the alpha plane uses a different HEVC bit
stream, it also adds the same overhead again. So we removed the VPS
and SPS NALs and added a very small header with the equivalent
information (typically 4 bytes). We also removed the first NAL start
code which is not useful. It is still possible to reconstruct a
standard HEVC stream to feed an unmodified hardware decoder if needed.
作者是这样说的，但也没搞个reconstruct的程序，略坑啊。
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