ftypM4A M4A mp42isomM moovlmvhd+{+|"V" p@Btrak\tkhd+{+|" p@B=mdia mdhd+{+|"V" pU"hdlrsounAminfsmhd$dinfdref url AstblgstsdWmp4aD3esds"@}}stts(stsc   stsz