libdvdread fails on multiple copies of the same DVD at the same point.

There isn't enough information to troubleshoot this problem. Try collecting a log from playing this movie in mplayer with debug turned on and attach that to the bug report. Also, please test if this issue can be reproduced in maverick.

This bug still exist, 10.10 cannot play dvd's stable. Does not matter what kinda drive, sata / pata, does not matter which player is used. Tested vlc, video-player and gnome-mplayer with this. Here you get a mplayer debug from this issue. Movies are only played some minutes, then suddenly stops.

ERROR: mplayer: No such file or directory
Playing dvd://1.
ERROR: Failed to open LIRC support. You will not be able to use your remote control.
ERROR: libdvdread: Using libdvdcss version 1.2.10 for DVD access
ID_DVD_TITLES=7
ID_DVD_TITLE_1_CHAPTERS=36
ID_DVD_TITLE_1_ANGLES=1
ERROR: libdvdread: Can't seek to block 3214014
ID_DVD_TITLE_2_CHAPTERS=2
ERROR: libdvdread: Can't seek to block 3214014
ID_DVD_TITLE_2_ANGLES=1
ERROR: libdvdread: Invalid IFO for title 2 (VTS_02_0.IFO).
ID_DVD_TITLE_3_CHAPTERS=2
ERROR: libdvdread: Can't seek to block 3800091
ID_DVD_TITLE_3_ANGLES=1
ERROR: libdvdread: Can't seek to block 3800091
ID_DVD_TITLE_4_CHAPTERS=2
ERROR: libdvdread: Invalid IFO for title 3 (VTS_03_0.IFO).
ID_DVD_TITLE_4_ANGLES=1
ERROR: libdvdread: Can't seek to block 3214014
ID_DVD_TITLE_5_CHAPTERS=2
ERROR: libdvdread: DVDDiscId read returned 0 bytes, wanted 34816
ID_DVD_TITLE_5_ANGLES=1
ERROR:
ID_DVD_TITLE_6_CHAPTERS=2
ERROR: libdvdread: Attempting to retrieve all CSS keys
ID_DVD_TITLE_6_ANGLES=1
ERROR: libdvdread: This can take a _long_ time, please be patient
ID_DVD_TITLE_7_CHAPTERS=1
ERROR:
ID_DVD_TITLE_7_ANGLES=1
ERROR: libdvdread: Get key for /VIDEO_TS/VIDEO_TS.VOB at 0x0000013e
ID_DVD_TITLE_1_LENGTH=6876.360
ERROR: libdvdread: Elapsed time 0
ID_DVD_VOLUME_ID=DELTA_GOODREM
ERROR: libdvdread: Get key for /VIDEO_TS/VTS_01_0.VOB at 0x00000197
There are 7 titles on this DVD.
ERROR: libdvdread: Elapsed time 0
ID_DVD_CURRENT_TITLE=1
ERROR: libdvdread: Get key for /VIDEO_TS/VTS_01_1.VOB at 0x00027516
There are 1 angles in this DVD title.
ERROR: libdvdread: Elapsed time 0
audio stream: 0 format: ac3 (5.1) language: unknown aid: 128.
ERROR: libdvdread: Get key for /VIDEO_TS/VTS_02_0.VOB at 0x00310acf
ID_AUDIO_ID=128
ERROR: libdvdread: Elapsed time 0
audio stream: 1 format: ac3 (stereo) language: unknown aid: 129.
ERROR: libdvdread: Get key for /VIDEO_TS/VTS_02_1.VOB at 0x00319194
ID_AUDIO_ID=129
ERROR: libdvdread: Elapsed time 0
number of audio channels on disk: 2.
ERROR: libdvdread: Get key for /VIDEO_TS/VTS_03_0.VOB at 0x0039fc24
number of subtitles on disk: 0
ERROR: libdvdread: Elapsed time 0
CHAPTERS: 00:00:00,00:05:47,00:05:55,00:10:06,00:14:29,00:16:18,00:19:48,00:20:06,00:24:39,00:25:56,00:29:11,00:32:46,00:38:00,00:38:57,00:43:41,00:47:45,00:48:57,00:53:01,00:53:42,00:58:04,00:58:36,01:02:07,01:05:50,01:07:04,01:13:42,01:18:34,01:22:30,01:25:44,01:27:46,01:31:54,01:33:49,01:37:50,01:38:37,01:45:07,01:53:06,01:54:34,
ERROR: libdvdread: Get key for /VIDEO_TS/VTS_03_1.VOB at 0x0039fc2b
ID_VIDEO_ID=0
ERROR: libdvdread: Elapsed time 0
MPEG-PS file format detected.
ERROR: libdvdread: Found 3 VTS's
ID_AUDIO_ID=129
ERROR: libdvdread: Elapsed time 0
VIDEO: MPEG2 720x576 (aspect 3) 25.000 fps 8600.0 kbps (1075.0 kbyte/s)
ERROR: open: No such file or directory
ID_FILENAME=dvd://1
ERROR: [MGA] Couldn't open: /dev/mga_vid
ID_DEMUXER=mpegps
ERROR: open: No s...

Does not matter which dvd, i have many dvd concerts and viewed them well up to ubuntu 9.xx versions. VLC shows the same bogus, the error seems to be in libdvdread.

libdvdread: Elapsed time 0
libdvdread: Found 4 VTS's
libdvdread: Elapsed time 0
libdvdread: Can't seek to block 229876

Have fixed the problem with firmware upgrades at both drives and checking their cabling. This is a bit ugly, users with this error should check their drives.

[Expired for libdvdread (Ubuntu) because there has been no activity for 60 days.]

This bug still exists on Ubuntu 11.10 and vlc. Some movies stop after e.g. 2:30 h with
libdvdread: Can't seek to block xxxxxxx

This bug was fixed in the package libdvdread - 5.0.0-1ubuntu1

---------------
libdvdread (5.0.0-1ubuntu1) utopic; urgency=medium

  * Merge from Debian unstable. Remaining changes:
    - Re-add missing install-css.sh.
    - debian/control: add Suggests for install-css.sh on debhelper,
      fakeroot, and build-essential.
    - debian/rules: install install-css.sh, leave perms executable.

libdvdread (5.0.0-1) unstable; urgency=medium

  [ Matteo F. Vescovi ]
  * New upstream release
    - debian/patches: patchset re-worked against v4.9.9
  * Imported Upstream version 4.9.9
  * debian/patches: patchset re-worked against v4.9.9

  [ Benjamin Drung ]
  * dvdread-config is gone now.
  * Drop dvdread-config_manpage.patch.
  * DEVELOPMENT-POLICY.txt is gone.
  * debian/rules: Update list of unused files.
  * Add missing pkg-config dependency.

  [ Reinhard Tartler ]
  * Imported Upstream version 5.0.0
    - Fixes libdvdread runs out of memory (LP: #377414)
    - Fixes: libdvdread4 unable to read Wall.e encrypted DVDs (LP: #590983)
    - Fixes: libdvdread: Can't seek to block (LP: #983535, #446664, #1066317)
    - Fixes: Zero check failed in ifo_read.c:904 for pgc->subp_control[i]
             = 0x00000001 (LP: #1179913, Closes: #504256)
  * Refresh patches, drop merged patches
 -- Benjamin Drung <email address hidden> Sun, 17 Aug 2014 23:03:17 +0200