# https://developers.google.com/speed/webp/docs/riff_container

# FourCC
"ALPH"
"ANIM"
"ANMF"
"EXIF"
"ICCP"
"RIFF"
"VP8 "
"VP8L"
"VP8X"
"WEBP"
"XMP "

# VP8 signature
"\x9D\x01\x2A"