Although the mythwebburn script seems pretty near perfect in R5A22, it stops when it gets to the point where it should burn my DVD-R. I get the following error:

Burning DVD-R image
Sent UDP/XML packet to IP 255.255.255.255 and port: 6948
unable to open64("/dev/dvd",O_RDONLY): Permission denied
***********************************
MythTV BurnDVD stopped due to error
***********************************
Sent UDP/XML packet to IP 255.255.255.255 and port: 6948



I can easily write a DVD-R from an xterm window using the growisofs command, but I'd rather it all happen within the mythwebburn script. I'm pretty sure my DVD writer is actually mounted as /dev/cdrom and not as /dev/dvd. What would be the best course of action: relabel my DVD writer as /dev/dvd and risk things elsewhere not working properly, or alter the /dev/dvd line within the mythwebburn script. If the latter, where do I find it - I've looked in all the .php files and .conf files I can find that are related to DVD burning.

Thanks.

Maybe add another device for /dev/dvd. I'm pretty sure it's OK to have the same name for two different devices.

Here are the relevant entries in my box:

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My box also has very similar entries, ie. - both /dev/cdrom and /dev/dvd are linked (if that's the correct term" to /dev/hda - so I don't think that's the problem. I put a blank DVD-R in the drive and tried



but it said it was read-only and couldn't mount the drive. Are there other "devices" that are defined as DVD writeable that would allow me to mount the blank DVD-R?

Those are symbolic links and you can have as many of them as you want to the same file system object. For example:

Here you see two symbolic links cdrom and dvd (notice the 'l' in the first colum) with the same destination, /dev/hdc. The 'b' in the first column for that tells you that it's a "block device" - i.e. a disk or tape of some kind.

OK, that sounds screwy, since /dev/hda (the primary master IDE drive) is normally your hard disk. Do this:
and post the results here.

tjc:

I have a SATA drive instead of an IDE drive. Consequently my hard drive is actually /dev/sda.

Here are the results of the grep:

OK, I kind of figured that was one of the possibilities. What does this show?

I am getting the same error when I try Mythwebburn. I just installed R5a26. All else seems to work.

mythtv@mythtv:~$ ls -al /dev/cdrom /dev/dvd /dev/hda
lrwxrwxrwx 1 root cdrom 8 Nov 25 20:20 /dev/cdrom -> /dev/hdc
lrwxrwxrwx 1 root cdrom 8 Nov 25 20:20 /dev/dvd -> /dev/hdc
brw-rw---- 1 root disk 3, 0 May 7 2004 /dev/hda
mythtv@mythtv:~$ grep cdrom /etc/group
cdrom:*:24:mythtv,tb12
mythtv@mythtv:~$


mythtv@mythtv:~$ grep [hs]d[abcdefgh][:1234567] /var/log/dmesg
ide0: BM-DMA at 0xfff0-0xfff7, BIOS settings: hda:DMA, hdb:pio
ide1: BM-DMA at 0xfff8-0xffff, BIOS settings: hdc:DMA, hdd:pio
hda: Maxtor 6L200R0, ATA DISK drive
hdc: MATSHITADVD-RAM SW-9585, ATAPI CD/DVD-ROM drive
hda: max request size: 1024KiB
hda: 398297088 sectors (203928 MB) w/16384KiB Cache, CHS=24792/255/63, UDMA(66)
hda: cache flushes supported
hda: hda1 hda2 hda3 hda4
hdc: ATAPI 40X DVD-ROM DVD-R-RAM CD-R/RW drive, 2048kB Cache, UDMA(66)
Adding 996020k swap on /dev/hda2. Priority:-1 extents:1
EXT3 FS on hda1, internal journal
EXT3 FS on hda4, internal journal

Any ideas??

TB, if your CD/DVD is /dev/hda, then having /dev/cdrom and /dev/dvd point to /dev/hdc won't do much. Try this as root:

cd /dev
rm cdrom dvd
ln -s /dev/hdc cdrom
ln -s /dev/hdc dvd
chmod 666 hdc

and then try to burn the disk again (the following command will be much faster then re-running the burn scripts)

growisofs -Z /dev/dvd -dvd-video -V "MythTV BurnDVD" /myth/mythburn/DVD

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It worked!!

Thanks, Nigel.

Knoppmyth...so butter.

For anyone else out there facing this problem, you might also consider adding the user that will be running the script to the cdrom group.

For me, /dev/dvd links to /dev/hdc. If I run "ls -a /dev/hdc" I get:



In a knoppmyth install (I have R5A16) mythtv is in the cdrom group by default, however, the web server runs as www-data. To allow burning dvd's from the webserver su into root or use sudo and run the following command:



This will work for any user you want to have cdrom rw access by substituting the username in for "www-data". This is a little more secure as it still restricts who can write to the cdrom drive. To change your rwx permissions to match mine, as root you would run:

This is definitely the more correct solution.

This doesn't seem to work in my instance. I have added www-data to the cdrom group, and if I were to 'su - www-data' and then do an 'id', I get:
uid=33(www-data) gid=33(www-data) groups=24(cdrom),33(www-data)

However, when I put an 'id' command in mythtvburn.sh, this is what is output:
uid=33(www-data) gid=33(www-data) groups=33(www-data)

So, whereever mythburn is being invoked, it is not picking up the cdrom group from /etc/groups, and therefore, I still get "Permission denied".

Nevermind the above. I stopped and restarted my apache server, and now the www-data user has cdrom in its group:

uid=33(www-data) gid=33(www-data) groups=24(cdrom),33(www-data)