#metabrainz

Yeah there is. Just like DVDs have an audio standard.

the traditional way for doing disc ids for dvd is to just do an md5 hash of one or more of the info files in the filesystem, iirc

i imagine something similar would work for bd

keep in mind that DVD and Blu-Ray are both just computer filesystems (UDF) full of files, they don't really have a structure with "tracks" etc.

Reading title/chapter/etc. requires parsing some files on a dvd; for identification a simple hash is easier.

Standard Title ID might work well for many, many disks

*discs

particularly since title/chapters/etc in the dvd structure don't really match up with the user-visible dvd contents, since it's all done with menus and programming.

not sure what you mean by "title id", the filesystem label?

I thought the disc format had an id string at least for movie type discs, seems I'm wrong, at least on bluray.

the disk filesystem itself has a label string, which is what shows up when you e.g. put the disk in a computer

but that's just entered arbitrarily by the person who mastered the disk, so it's meaningless and not unique

(many DVD and Blu-Ray backup software can copy the disk contents to a folder on your HD, which means this filesystem label string is lost completely)

although they normally use that label to name the folder, at least by default :)

oh, huh, I'm wrong for DVDs at least, the name is also in the VIDEO_TS.IFO file

Ah so I was correctly remembering that.

but yeah, if I was making and ID to use to lookup a DVD, I'd use a hash of the VIDEO_TS.IFO, or maybe a hash over all the *.IFO files.

might be a bit complex for DVDs, I dunno if you have to authenticate to the drive before you can read those off a physical disk :/

No DVD is pretty simple I think

Pretty sure those are all laid bare since they are used to identify which files to play

hmm, until a player has authenticated to the drive, the drive will reject read attempts on the DVD with an I/O error

kind of annoying, really

but if you can mount the disk, it's easy; if you can play it with some other player, then you can read the files afterwards just fine :/

Pretty sure authenticating the drive is not a problem.

hmm. it must be something like that, tho.

if I try to read a disk before starting a dvd player on it or using a libdvdcss app on it, it gives IO errors rather than data :/

...sometimes, usually only the first time after boot

Yeah that's right

there's nothing like that on Blu-Ray disks; instead, the encryption is done on the individual files rather than at the disk level

so you can mount a blu-ray and see the encrypted files and read them just fine.

without doing anything special

actually decrypting them is harder, of course ;)

Yeah I have one bluray drive, which is read only and for desktops. I'd need a USB one to test.

Or to exploit my DVD player and force it to copy the disc

I got a blu-ray writer simply because read-only drives were harder to fine. I don't think I'll ever actually get any writable media for it...

I'd love to have some discs and a writer. I think it'd be a good backup scheme.

hmm. on an encrypted BD disk, there's actually a unique volume id (32 hex digits) stored in a cleartext xml file on the disk

which would be perfectly reasonable to use for lookups

this is apparently the ISAN number

Yeah that would make sense.

not present on disks without encryption tho (but all commercial releases have encryption)

lol, of course this is too good to be try. The first random BD I check doesn't have a 'contentID' number stored there

too good to be true.

Can you upload the file somewhere?

Also what is [off]? I keep seeing it and now I have no idea what it means.

it prevents that message from being logged in the official chatlogs

Ahh

Off the record

:O

I never made that connection

... is the chat logger actually running atm?

yeah, BrainzBot is here

the old chatlogs.musicbrainz.org page links to archive.org

so I'm not sure how to see the logs

chatlogs.metabrainz.org is the new page :P

I miss the chatlogger on all the channels I'm in on EsperNet. It has such a nice stats page

that khobbits one?

Yeah

Not as nice chat display as the one here, but stats page is fun.

yeah, I love that, the quotes are always fun to read

I was topping a few "most nicks", I used to change my nick for everything. Now I typically use /away

For some reason the channels I'm in mostly use away nicks instead.

but this is mostly because a lot of official stuff, including meetings, is discussed here and being able to link to that is quite useful

yeah, the mcmf.xml file seems kinda useless as an ID

Hashing the first stream might be alright then. Only the player itself would have decrypted versions.

So it's not like it would be different hashes for different people

nah, there's a bunch of other info files and stuff on the disk that could be hashed

we wouldn't want to actually hash a stream, they can be massive

Wouldn't matter, most every CPU has significant hashing power.

Even arm chips have hardware acceleration

the limit is disc read speed :)

Hmm

00000.m2ts on this disk is 5.6gb, and my drive can pull maybe 20mb/s

That's a hella slow drive.

between 4x and 6x depending on the region of the disk, yeah

it's not a fast drive, it's a fairly early drive, and on the cheap end :)

Ah

it's definitely fast enough for realtime playback, of course.

probably even for 4k bd

Maybe

Actually yes it is

I was confusing megabits and megabytes

lets see. Hashing index.bdmv and MovieObject.bdmv, alongside maybe also the CLIPINF/*.clpi files would probably be sufficiently unique.

that seems to work rather well. Reads 100-200kb on most disks

hmm. should probably do the mpls files too

I wonder if there's any media library programs (kodi?) that have already solved this

Maybe

hl_calc isn't running anymore on spike, is this expected ? apparently it was stopped manually

zas: OSUOSL no longer gets new data dumps, can you see why?

I can access data.mb.o normally.

Hey chirlu

i'll have a look

Project search_server build #75: STILL FAILING in 23 sec: https://ci.metabrainz.org/job/search_server/75/

* rob: Make the necessary change to cope with Jaxb's new class format.

* rob: More fix-ups related to the jaxb changes.

* rob: Replacing WTF code with actual code. WTF *was* that? :D

chirlu: on our side, rsync is running and accessible locally, but i can't access to rsync from the rest of the world, prolly this port is blocked by the firewall in front of ours, i'll ask DWNI to check

ok ticket sent

i see nothing wrong on our side, i suspect the DWNI firewall because we had such issues (unaccessible services from outside) before

How does the syncing happen? Via rsync?

yes

modwizcode: /away > nick change