fix isMPEG2TS
ix isMPEG2TS
some m3u8 file like this (not work)
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:6
#EXT-X-PLAYLIST-TYPE:VOD
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:3.127,
xxx.png
#EXTINF:3.127,
xxx.jpg
#EXT-X-ENDLIST
Edited by Jean-Baptiste Kempf