the branch 4147 of CEF. precisely, CEF 84.3.8 which includes Chromium 84.0.4147.105，support mp4, self debuged, release edition x86，. 自己编译的，支持 Mp4，x86版本 set GN_DEFINES=is_component_build=true set proprietary_codecs=true ffmpeg_branding=Chrome set GN_