[MEncoder-users] Mencoder - Differences between using libc for DVDaccess and Win2K API

[Nigel Arnold]

Why is libc so much faster than Win2K API and

why isn't libc the default when using just D:\

"Nigel Arnold" <nkarnold at googlemail.com> wrote in message 
news:fu5h15$94h$1 at ger.gmane.org...
> Hello All
>
> I've been doing some speed tests with mencoder and found this, which i 
> think is quite incredible and I'm open to any comments/thoughts/insights 
> as to why it may happen.
>
> Mencoder build is 25513 provided by Sherpya and therefore is Win32
>
> My simple command line is
>
> mencoder.exe dvd://2 -dvd-device D:\  -Chapter 03-03  -of lavf -lavfopts 
> format=mp4 -oac lavc -ovc lavc -lavcopts 
> aglobal=1:vglobal=1:vcodec=mpeg4:acodec=libfaac:vbitrate=1500:abitrate=128:threads=8 
>  -vf scale=720:-10,harddup -ofps 25 -o "Test.mp4"
>
> I get about 45 fps speed encoding, with the above
>
> However, If i change the -dvd-device to D:\VIDEO_TS instead of D:\
>
> mencoder.exe dvd://2 -dvd-device D:\VIDEO_TS  -Chapter 03-03  -of 
> lavf -lavfopts format=mp4 -oac lavc -ovc lavc -lavcopts 
> aglobal=1:vglobal=1:vcodec=mpeg4:acodec=libfaac:vbitrate=1500:abitrate=128:threads=8 
>  -vf scale=720:-10,harddup -ofps 25 -o "Test.mp4"
>
> I get a massive 150fps and it obviously takes a fraction of time to 
> encode. This is HUGE speed increase
>
> So here is my question, WHY so slow when using D:\ and so fast when using 
> D:\VIDEO_TS
>
> The only thing i've found is this
>
> If i set the ENV variable DVDCSS_VERBOSE to 2, to enable the CSS messages 
> on stderr and stdoutput, I can see the following
>
> When using D:\ as the -dvd-device
> MEncoder Sherpya-SVN-r25513-4.2.2 (C) 2000-2007 MPlayer Team
> CPU: Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz (Family: 6, Model: 
> 15, Step
> ping: 11)
> CPUflags: Type: 6 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
> Compiled with runtime CPU detection.
> libdvdcss debug: opening target `d:\'
> libdvdcss debug: using Win2K API for access                            <<< 
> This is the main difference that i can see
> libdvdcss debug: disc is scrambled
> libdvdcss debug: requesting AGID
> libdvdcss debug: drive authenticated, using variant 0
> libdvdcss debug: authentication established
> libdvdcss debug: GetASF authenticated, ASF=1
> libdvdcss debug: decrypting disc key a2:ee:d9:3a:64
> libdvdcss debug: trying player key 01:af:e3:12:80
> libdvdcss debug: decrypted disc key is 2e:97:32:1f:24
> libdvdcss debug: using CSS key cache dir: C:\Documents and 
> Settings\xxxxxx/.dvdcss/MP725D-2007022113200800-2e97321f24/
>
>
> When using D:\VIDEO_TS as the -dvd-device
> libdvdcss debug: opening target `d:\video_ts'
> libdvdcss debug: using libc for access
> There are 21 titles on this DVD.
> There are 12 chapters in this DVD title.
> There are 1 angles in this DVD title.
> libdvdcss debug: opening target `d:\video_ts/VTS_02_0.IFO'
> libdvdcss debug: using libc for access
> libdvdcss debug: using CSS key cache dir: C:\Documents and 
> Settings\xxxxx/.dvdcss/-00cf6c0000d03300-0000000000/
> libdvdcss debug: opening target `d:\video_ts/VTS_02_1.VOB'
> libdvdcss debug: using libc for access
> libdvdcss debug: cracking title key at block 0
> libdvdcss debug: successful attempts 1/1, scrambled blocks 37/38
> libdvdcss debug: vts key initialized
> libdvdcss debug: title key is c0:00:00:00:02
> libdvdcss debug: opening target `d:\video_ts/VTS_02_2.VOB'
> libdvdcss debug: using libc for access
> libdvdcss debug: cracking title key at block 0
> libdvdcss debug: successful attempts 1/1, scrambled blocks 766/2477
> libdvdcss debug: vts key initialized
> libdvdcss debug: title key is c0:00:00:00:02
> libdvdcss debug: opening target `d:\video_ts/VTS_02_3.VOB'
> libdvdcss debug: using libc for access
> libdvdcss debug: cracking title key at block 0
> libdvdcss debug: successful attempts 1/1, scrambled blocks 474/1426
> libdvdcss debug: vts key initialized
> libdvdcss debug: title key is c0:00:00:00:02
> libdvdcss debug: opening target `d:\video_ts/VTS_02_4.VOB'
> libdvdcss debug: using libc for access
> libdvdcss debug: cracking title key at block 0
> libdvdcss debug: at block 4096, still cracking...
> libdvdcss debug: at block 8192, still cracking...
> libdvdcss debug: at block 12288, still cracking...
> libdvdcss debug: at block 16384, still cracking...
> libdvdcss debug: successful attempts 1/1, scrambled blocks 5076/17439
> libdvdcss debug: vts key initialized
> libdvdcss debug: title key is c0:00:00:00:02
> libdvdcss debug: opening target `d:\video_ts/VTS_02_5.VOB'
> libdvdcss debug: using libc for access
> libdvdcss debug: cracking title key at block 0
> libdvdcss debug: at block 4096, still cracking...
> libdvdcss debug: at block 8192, still cracking...
> libdvdcss debug: at block 12288, still cracking...
> libdvdcss debug: at block 16384, still cracking...
> libdvdcss debug: at block 20480, still cracking...
> libdvdcss debug: at block 24576, still cracking...
> libdvdcss debug: successful attempts 1/1, scrambled blocks 5017/26209
> libdvdcss debug: vts key initialized
> libdvdcss debug: title key is c0:00:00:00:02
> libdvdcss debug: opening target `d:\video_ts/VTS_02_6.VOB'
> libdvdcss debug: using libc for access
> libdvdcss debug: cracking title key at block 0
> libdvdcss debug: at block 4096, still cracking...
> libdvdcss debug: at block 8192, still cracking...
> libdvdcss debug: at block 12288, still cracking...
> libdvdcss debug: at block 16384, still cracking...
> libdvdcss debug: at block 20480, still cracking...
> libdvdcss debug: at block 24576, still cracking...
> libdvdcss debug: at block 28672, still cracking...
> libdvdcss debug: at block 32768, still cracking...
> libdvdcss debug: successful attempts 1/1, scrambled blocks 10978/35566
> libdvdcss debug: vts key initialized
> libdvdcss debug: title key is c0:00:00:00:02
>
>
> Any comments, thoughts, is this normal ?
>
> Thanks
>
> N