[mythtv-users] How long should a mythdvd perfect rip take?

Mon Jun 26 13:32:01 UTC 2006

Hello -
  I'm writing to inquire about how long (on average) it requires for people
to do a "perfect rip" via MythDVD.  The reason I ask is because I believe
that I was able to do this via an older 0.18 version of myth in roughly 20
minutes.  I've since rebuilt this system (though kept the hardware the same)
and now that I'm running a recent version of myth (and mythplugins) checked
out from the svn trunk, It's taking between 65-75 minutes to do a perfect
rip.  Obviously my metrics aren't exact and the software load has changed
substantially, but I was just hoping I could get some feedback as to how
long it is taking others to get a perfect rip of a full-lenght dvd?  I
presume most dvd's these days are dual-layer, if that narrows down the
feedback at all.  If this is the same performance others are getting for
this type of DVD drive, then I can stop worrying this issue and move on to
other things!

Just to provide some insight into my system, here are the specs that might
be considered pertinent:

   - DVD Drive - Lite-On 1683S.  I've read numerous places on the web
   that these drives can only effectively read a dual-layer DVD a 8x.  I belive
   8x means 8*150Kbytes per second, which is 1.2Mbytes per second.  Doing
   the math, that means it would/should take 100+ minutes to read a 6-8Gig
   DVD.  This doesn't seem correct, so surely my logic is wrong.
   - My machine is running FC4 with 2.6.16-1.2115_FC4.  All software
   EXCEPT for myth is running at the latest version (as of 6/25/06) via a yum
   upgrade.
   - machine is writing to an LVM that is a hetergenous combination of
   SATA and IDE drives.  This concerned me at first, but I've done timing tests
   with 'dd' and don't see any difference writing the data from DVD to
   /dev/null or the mythvideo mount point.
   - I've included the output below attained from running cdrecord to
   dump params as well my dd tests below.

Thank you in advance for any information you may be able to provide.

thanks, doug.

[root at myth1 ~]# cat /proc/sys/dev/cdrom/info
CD-ROM information, Id: cdrom.c 3.20 2003/12/17

drive name:             hde
drive speed:            63
drive # of slots:       1
Can close tray:         1
Can open tray:          1
Can lock tray:          1
Can change speed:       1
Can select disk:        0
Can read multisession:  1
Can read MCN:           1
Reports media changed:  1
Can play audio:         1
Can write CD-R:         1
Can write CD-RW:        1
Can read DVD:           1
Can write DVD-R:        1
Can write DVD-RAM:      0
Can read MRW:           0
Can write MRW:          0
Can write RAM:          1

[root at myth1 mythtv]# cdrecord -prcap -dev=/dev/dvd
Cdrecord-Clone 2.01-dvd (i686-pc-linux-gnu) Copyright (C) 1995-2004 JA¶rg
Schilling
Note: This version is an unofficial (modified) version with DVD support
Note: and therefore may have bugs that are not present in the original.
Note: Please send bug reports or support requests to
http://bugzilla.redhat.com/bugzilla
Note: The author of cdrecord should not be bothered with problems in this
version.
scsidev: '/dev/dvd'
devname: '/dev/dvd'
scsibus: -2 target: -2 lun: -2
Linux sg driver version: 3.5.27
Using libscg version ' schily-0.8'.
cdrecord: Warning: using inofficial libscg transport code version (schily -
Red Hat-scsi-linux1.83 04/05/20 Copyright 1997 J. Schilling').
Device type    : Removable CD-ROM
Version        : 0
Response Format: 2
Capabilities   :
Vendor_info    : 'LITE-ON '
Identifikation : 'DVDRW SOHW-1693S'
Revision       : 'KS06'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.

Drive capabilities, per MMC-3 page 2A:

  Does read CD-R media
  Does write CD-R media
  Does read CD-RW media
  Does write CD-RW media
  Does read DVD-ROM media
  Does read DVD-R media
  Does write DVD-R media
  Does not read DVD-RAM media
  Does not write DVD-RAM media
  Does support test writing

  Does read Mode 2 Form 1 blocks
  Does read Mode 2 Form 2 blocks
  Does read digital audio blocks
  Does restart non-streamed digital audio reads accurately
  Does support Buffer-Underrun-Free recording
  Does read multi-session CDs
  Does read fixed-packet CD media using Method 2
  Does not read CD bar code
  Does read R-W subcode information
  Does not return R-W subcode de-interleaved and error-corrected
  Does read raw P-W subcode data from lead in
  Does return CD media catalog number
  Does return CD ISRC information
  Does support C2 error pointers
  Does not deliver composite A/V data

  Does play audio CDs
  Number of volume control levels: 256
  Does support individual volume control setting for each channel
  Does support independent mute setting for each channel
  Does not support digital output on port 1
  Does support digital output on port 2
  Does not send digital data LSB-first
  Does not set LRCK high for left-channel data
  Does not have valid data on falling edge of clock
  Length of data in BCLKs: 16

  Loading mechanism type: tray
  Does support ejection of CD via START/STOP command
  Does not lock media on power up via prevent jumper
  Does allow media to be locked in the drive via PREVENT/ALLOW command
  Is not currently in a media-locked state
  Does not support changing side of disk
  Does not have load-empty-slot-in-changer feature
  Does not support Individual Disk Present feature

  Maximum read  speed: 11080 kB/s (CD  62x, DVD  8x)
  Current read  speed: 11080 kB/s (CD  62x, DVD  8x)
  Maximum write speed: 22160 kB/s (CD 125x, DVD 16x)
  Current write speed: 22160 kB/s (CD 125x, DVD 16x)
  Rotational control selected: CLV/PCAV
  Buffer size in KB: 2048
  Copy management revision supported: 1
  Number of supported write speeds: 9
  Write speed # 0:  8467 kB/s CLV/PCAV (CD  48x, DVD  6x)
  Write speed # 1:  7056 kB/s CLV/PCAV (CD  40x, DVD  5x)
  Write speed # 2:  5645 kB/s CLV/PCAV (CD  32x, DVD  4x)
  Write speed # 3:  4234 kB/s CLV/PCAV (CD  24x, DVD  3x)
  Write speed # 4:  2822 kB/s CLV/PCAV (CD  16x, DVD  2x)
  Write speed # 5:  2112 kB/s CLV/PCAV (CD  12x, DVD  1x)
  Write speed # 6:  1764 kB/s CLV/PCAV (CD  10x, DVD  1x)
  Write speed # 7:  1411 kB/s CLV/PCAV (CD   8x, DVD  1x)
  Write speed # 8:   706 kB/s CLV/PCAV (CD   4x, DVD  0x)

[root at myth1 mythtv]# time -p dd if=/dev/cdrom of=/dev/null bs=1k count000
15000+0 records in
15000+0 records out
real 12.09
user 0.00
sys 0.68
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