问题：您能否推荐一款外置 DVD 播放器，让我可以使用 Ubuntu 18.04 观看欧洲合法电影（区域代码：2）？
我买了一台新笔记本和一个外置 DVD 播放器，因为它没有。我安装了 Ubuntu，并安装了所有必要的libdvd*软件包：
ii libdv4:amd64 1.0.0-11
ii libdvbpsi10:amd64 1.3.2-1
ii libdvd-pkg 1.4.2-1-1
ii libdvdcss-dev:amd64 1.4.2-1~local
ii libdvdcss2:amd64 1.4.2-1~local
ii libdvdnav4:amd64 6.0.0-1
ii libdvdread4:amd64 6.0.0-1
ii ubuntu-restricted-extras 66
ii regionset 0.1-3.1
然后我想播放 DVD 并收到 3 页错误消息：
$ vlc dvd://sr0
VLC media player 3.0.8 Vetinari (revision 3.0.8-0-gf350b6b5a7)
libdvdnav: Using dvdnav version 6.0.0
libdvdnav: DVD Title: VENOM_2018
libdvdnav: DVD Serial Number: 4d9292d9
libdvdnav: DVD Title (Alternative):
libdvdnav: DVD disk reports itself with Region mask 0x00e50000. Regions: 2 4 5
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 0x00000167
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_01_0.VOB at 0x000002f5
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_01_1.VOB at 0x0000d271
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_15_0.VOB at 0x002dade8
libdvdread: Error cracking CSS key for /VIDEO_TS/VTS_15_0.VOB (0x002dade8)
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_15_1.VOB at 0x002daf42
libdvdread: Error cracking CSS key for /VIDEO_TS/VTS_15_1.VOB (0x002daf42)!!
libdvdread: Elapsed time 0
libdvdread: Found 15 VTS's
libdvdread: Elapsed time 0
libdvdread: Invalid IFO for title 14 (VTS_14_0.BUP).
libdvdread: Can't seek to block 2993628
libdvdread: Can't seek to block 2993628
libdvdread: Can't seek to block 2993628
libdvdread: Can't seek to block 2997149
libdvdread: Can't seek to block 2997149
libdvdread: Can't seek to block 2997149
libdvdread: Invalid IFO for title 15 (VTS_15_0.BUP).
libdvdread: Can't seek to block 2963152
libdvdread: Can't seek to block 2963152
libdvdread: Invalid IFO for title 12 (VTS_12_0.IFO).
libdvdnav: ifoOpenVTSI failed
然后我将外置 DVD 连接到带有内置 DVD 的旧笔记本。我能够通过内置 DVD 播放 DVD，但外置 DVD 返回了相同的错误消息。
设备：
$ dmesg | grep -i dvd
[ 5164.196463] scsi 2:0:0:0: CD-ROM HL-DT-ST DVDRAM GP57ES40 PF01 PQ: 0 ANSI: 0
[ 5164.220633] sr 2:0:0:0: [sr0] scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray
$ sudo lshw -C disk
*-cdrom
description: DVD-RAM writer
product: DVDRAM GP57ES40
vendor: HL-DT-ST
physical id: 0.0.0
bus info: scsi@2:0.0.0
logical name: /dev/cdrom
logical name: /dev/cdrw
logical name: /dev/dvd
logical name: /dev/dvdrw
logical name: /dev/sr0
version: PF01
capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram
configuration: status=ready
*-medium
physical id: 0
logical name: /dev/cdrom
$ ls -l sr0
brw-rw----+ 1 root cdrom 11, 0 Nov 8 19:11 sr0
故障排除：
- 没有光盘菜单：
我删除了文件夹中与电影相关的文件夹~./dvdcss。我No disc menus在 VLC UI 中勾选了复选框，然后它播放了 DVD，但当播放到 19:18 时就停止了dvdread demux error: read failed for 3/4 blocks at 0x72d80
我尝试过了从命令行播放没有光盘菜单，它也可以工作：vlc dvdsimple://sr0
然后我尝试播放它定义title和chapter但它总是播放第一个标题：
vlc dvdsimple://sr0@01
vlc dvdsimple://sr0@02
我尝试列出titles和，chapters但当我尝试播放它时产生了相同的输出：
$ lsdvd /dev/sr0
libdvdread: Can't seek to block 2676815
libdvdread: Can't seek to block 2676815
libdvdread: Can't seek to block 2676815
libdvdread: Can't seek to block 2678061
libdvdread: Can't seek to block 2678061
libdvdread: Can't seek to block 2678061
libdvdread: Invalid IFO for title 2 (VTS_02_0.BUP).
libdvdread: Can't seek to block 2993628
libdvdread: Can't seek to block 2993628
libdvdread: Can't seek to block 2993628
libdvdread: Can't seek to block 2997149
libdvdread: Can't seek to block 2997149
libdvdread: Can't seek to block 2997149
libdvdread: Invalid IFO for title 15 (VTS_15_0.BUP).
Segmentation fault (core dumped)
- 我通过软件包将区域代码改为 2（我住在欧洲）
regionset。但没用。
$ regionset /dev/sr0
regionset version 0.1 -- reads/sets region code on DVD drives
Current Region Code settings:
RPC Phase: II
type: SET
vendor resets available: 4
user controlled changes resets available: 4
drive plays discs from region(s): 2, mask=0xFD
Would you like to change the region setting of your drive? [y/n]:n
我检查了 的值
DVDCSS_METHOD。它是空的。我将其更改为title、disc和key。它们都没有帮助。我安装了
mplayer，mplayer-gui和mencoder。修复了 GUI 错误并尝试播放 DVD。
$ mplayer dvd://
它对各个章节的识别不同（参见Error cracking CSS key以下内容）：
Playing dvd://.
There are 41 titles on this DVD.
There are 1 angles in this DVD title.
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 0x00000167
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_01_0.VOB at 0x000002f5
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_01_1.VOB at 0x0000d271
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_02_0.VOB at 0x0028d858
libdvdread: Error cracking CSS key for /VIDEO_TS/VTS_02_0.VOB (0x0028d858)
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_02_1.VOB at 0x0028d9b2
libdvdread: Error cracking CSS key for /VIDEO_TS/VTS_02_1.VOB (0x0028d9b2)!!
libdvdread: Elapsed time 0
它播放了 DVD 的前 4 章，直到播放到电影的同一时刻，就崩溃了。有趣的是，时间戳是 40 秒，更像是 19:50：
错误：
MPlayer interrupted by signal 2 in module: decode_video
A: 369.6 V: 369.6 A-V: -0.021 ct: 0.059 9237/9237 7% 1% 2.3% 0 0
如果我尝试播放其他 DVD，情况也是一样。是编码、驱动程序还是硬件错误？
你知道我该如何修复它吗？或者你有适合的外置 DVD 播放器吗？
答案1
我买了一台华硕 Zen Drive 外置 DVD 播放器，它运行良好。
所以结论是。不要为您的 Debian Linux 系统购买 Hitachi-LG 外置 DVD 播放器，因为它可能无法工作！
答案2
我的 DVD 驱动器坏了，我买了一个新的，遇到了类似的问题，控制台输出也类似。同一台 Ubuntu 18.04 计算机上的同一张 DVD 光盘在使用 VLC 之前可以正常工作，但使用新驱动器时却不行。我还安装了所有库。我以为我的新驱动器有问题。
但重新安装库使用
sudo apt install libdvd-pkg && sudo dpkg-reconfigure libdvd-pkg
成功了，现在新驱动器运行正常。对于原始发帖者来说，它可能不起作用，但希望它能帮助其他遇到类似问题的人。
附言！我有连接到计算机的新驱动器当我重新安装并重新配置 libdvd 时（我不知道这是否相关）。
PS！也许sudo dpkg-reconfigure libdvd-pkg也可以（尚未测试，因为我的现在正在工作）。查看更多信息Ubuntu 帮助页面。