[MPlayer-users] libdvdcss and libdvdread issues

[Michael Hunold]

Hello world,

I'm very pleased with "mplayer" and how it plays dvds so far, but of 
course you can always improve things...

For css decryption and dvd access, I'm currently using libdvdcss 1.0.0 
and libdvdread 0.9.2, which work nicely in conjunction with current 
mplayer cvs and with most of my dvds.

But sometimes (for example with Disney's "Tarzan") the title key 
cracking takes very long (> 15 seconds for one title key), and even 
fails sometimes (the new "Shrek" movie):

------------------------schnipp-----------------------------------
libdvdread: Attempting to retrieve all CSS keys
libdvdread: This can take a _long_ time, please be patient

libdvdread: Get key for /VIDEO_TS/VIDEO_TS.VOB at 0x000002d4
libdvdread: Elapsed time 1
libdvdread: Get key for /VIDEO_TS/VTS_01_0.VOB at 0x0002d6a3
libdvdread: Elapsed time 15
[...]
libdvdread: Get key for /VIDEO_TS/VTS_08_0.VOB at 0x0033d7a3
libdvdcss error: fatal error in vts css key
libdvdread: Error cracking CSS key!!
libdvdread: Elapsed time 93
libdvdread: Get key for /VIDEO_TS/VTS_08_1.VOB at 0x0033d7a8
libdvdcss error: fatal error in vts css key
libdvdread: Error cracking CSS key!!
libdvdread: Elapsed time 92
libdvdread: Get key for /VIDEO_TS/VTS_09_0.VOB at 0x0033d8be
libdvdcss error: fatal error in vts css key
libdvdread: Error cracking CSS key!!
libdvdread: Elapsed time 93
libdvdread: Get key for /VIDEO_TS/VTS_09_1.VOB at 0x0033d8c3
libdvdcss error: fatal error in vts css key
libdvdread: Error cracking CSS key!!
libdvdread: Elapsed time 93
libdvdread: Elapsed time 0
libdvdread: Found 9 VTS's
libdvdread: Elapsed time 389
------------------------schnipp-----------------------------------

In the changelog of libdvdcss I found the following remark:

 >  * 3) Decode the disc key with player keys (libcss method). However,
 > you need licensed player keys at build time for this to work.

Ok, when I do
 > export DVDCSS_METHOD=key

and compile in the necessary player keys (which can be found "floating 
around the internet"), I can see that libdvdcss uses the player keys I 
provided successfully, but decrypting is very, very slow...

I get tons of these messages (after setting DVDCSS_VERBOSE environment 
variable to "2") over and over again:

------------------------schnipp-----------------------------------
libdvdcss debug: decrypting title key with disc key
libdvdcss debug: GetASF authenticated
libdvdcss debug: already authenticated
libdvdcss debug: requesting AGID 1
libdvdcss debug: drive authentic, using variant 0
libdvdcss debug: authentication established
libdvdcss debug: received session key
libdvdcss debug: GetASF authenticated
libdvdcss debug: already authenticated
------------------------schnipp-----------------------------------

It takes > 5 minutes for all title keys, mplayer never actually starts 
displaying the movie, it simply displays these messages over and over again.

It seems that it gets stuck somewhere in the dvd access: If I "strace" 
the mplayer process, I can see that it always blocks on the "iotcl" call:

------------------------schnipp-----------------------------------
_llseek(5, 1456128, [1456128], SEEK_SET) = 0
  ioctl(5, 0x5392, 0xbfffd770)            = 0
------------------------schnipp-----------------------------------

ie. I can see

 > ioctl(5, 0x5392

then long pause, 3-4 seconds, then it continues.

I'll cross check this on another machine, but I want to make sure that 
I'm not doing something completely stupid before.

Any ideas are appreciated. I cannot belive that I am the only one who is 
annoyed by the "speed" of css decryption with newer dvds.

If this is considered off-topic here, please send a private mail. Thanks!

CU
Michael.