MAGIC_MASK        234 net/base/mime_sniffer.cc   MAGIC_MASK("video/mpeg", "\x00\x00\x01\xB0", "\xFF\xFF\xFF\xF0")
MAGIC_MASK        235 net/base/mime_sniffer.cc   MAGIC_MASK("audio/mpeg", "\xFF\xE0", "\xFF\xE0")