if the buffer mode more greater the int value, more condition it buffered, will be better:
0. NO BUFFER AT ALL
1. buffer true internet filesystems (streams) (http, etc.)
3. Buffer all internet filesystems (like 2 but additionally also ftp, webdav, etc.)
7. Buffer all internet filesystems (like 2 but additionally also ftp, webdav, etc.) with double-buffer for mp4/avi files (default)
15. Buffer all filesystems (including local), with double-buffer for mp4/avi files only on internet filesystems(param false)
31. Buffer all filesystems (including local), with double-buffer for mp4/avi files (including local)