Strange problem with WD Mybook Live nas
Copying the files to the nas was no problem. It achieves speeds about 60 MB which is pretty fast for a cheep nas.
I've put the .mkv files in a seperate share.
Soon I discovered that if I want to play a .mkv from the nas, Bsplayer took about 90-120 seconds to start playing the movie. If I put the file on a share of an other computer, Bsplayer starts within 1-2 seconds.
Of course the problem is within the nas, but because i did not have any problems playing dvd's with another program i began to wonder why Bsplayer took so long.
Analysing the problem I used PROCMON and traced the I/O Bsplayer does when start playing.
I was very suprised what it did. After opening the file it executed hundred of thousands 1 byte (!) reads towards the end of the file.
Only after the playing starts Bsplayer uses 65K block reads.
Furthermore I discovered that the 1 byte reads from the NAS took 143 times more time than from a normal computer share.
Of cause I asked WD support about this, but they denied the problem saying "we don't support Bsplayer".
Still I am wondering why Bsplayer does so many 1 byte reads opposed to other programs which don''t ? Why are these necessary ?
|live, mybook, nas, strange|
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