Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss
DVD - which filing system does cdfs use?
30 views
Skip to first unread message
Jim Lesurf
Jun 27, 2012, 4:59:21 AM6/27/12
to
Not sure which group to raise this on, so I chose misc...
I have a number of home-recorded Video DVDs. Some (recorded on Philips
videorecoders) are easily accessible on my Iyonix and my Linux boxes. But
others (Panasonic recorders) are fine on the Iyonix but need me to take an
action like modifying /etc/fstab to over-rule permissions to be fully
accessible with Linux.
I am using cdfs (normally) on the Iyonix, and running Xubuntu 11.10 on
Linux.
I'd assumed until recently that the Iyonix/RO was able to access the discs
because RO file 'permission' and 'ownership' is more basic than for Linux.
But it has occurred to me that there may be an alternative reason which
prompts my question.
What filing system does cdfs use to access a video DVD?
According to the DVD Video specs, the discs should contain at least two
different filers. One is the a form of UDF, the other iso9660. (Ok, it is
more complex than that!) I know that the Linux machine tries UDF and uses
that if present, only then defaulting to iso. So if the Iyonix/RO uses iso,
not UDF that might explain the 'problem' on Linux being due to something in
the UDF filer info that is absent from the iso info.
So what does cdfs (and cdromfs) do when presented with a disc with more
than one filer system on offer?
Slainte,
Jim
--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scots_Guide/intro/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html
I have a number of home-recorded Video DVDs. Some (recorded on Philips
videorecoders) are easily accessible on my Iyonix and my Linux boxes. But
others (Panasonic recorders) are fine on the Iyonix but need me to take an
action like modifying /etc/fstab to over-rule permissions to be fully
accessible with Linux.
I am using cdfs (normally) on the Iyonix, and running Xubuntu 11.10 on
Linux.
I'd assumed until recently that the Iyonix/RO was able to access the discs
because RO file 'permission' and 'ownership' is more basic than for Linux.
But it has occurred to me that there may be an alternative reason which
prompts my question.
What filing system does cdfs use to access a video DVD?
According to the DVD Video specs, the discs should contain at least two
different filers. One is the a form of UDF, the other iso9660. (Ok, it is
more complex than that!) I know that the Linux machine tries UDF and uses
that if present, only then defaulting to iso. So if the Iyonix/RO uses iso,
not UDF that might explain the 'problem' on Linux being due to something in
the UDF filer info that is absent from the iso info.
So what does cdfs (and cdromfs) do when presented with a disc with more
than one filer system on offer?
Slainte,
Jim
--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scots_Guide/intro/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html
Chris Evans
Jul 3, 2012, 8:26:43 AM7/3/12
to
In article <52a650d...@audiomisc.co.uk>, Jim Lesurf
AIUI it can access DVD ROM/RAM data CDs but not Video DVDs
Presumably the Video DVD player that Spellings (Adrian Lees) had suitable
drivers.
> According to the DVD Video specs, the discs should contain at least two
> different filers. One is the a form of UDF, the other iso9660. (Ok, it is
> more complex than that!) I know that the Linux machine tries UDF and uses
> that if present, only then defaulting to iso. So if the Iyonix/RO uses iso,
> not UDF that might explain the 'problem' on Linux being due to something in
> the UDF filer info that is absent from the iso info.
>
> So what does cdfs (and cdromfs) do when presented with a disc with more
> than one filer system on offer?
Chris Evans
--
CJE Micro's / 4D 'RISC OS Specialists'
Telephone: 01903 523222 Fax: 01903 523679
ch...@cjemicros.co.uk http://www.cjemicros.co.uk/
78 Brighton Road, Worthing, West Sussex, BN11 2EN
The most beautiful thing anyone can wear, is a smile!
<URL:mailto:no...@audiomisc.co.uk> wrote:
> Not sure which group to raise this on, so I chose misc...
>
> I have a number of home-recorded Video DVDs. Some (recorded on Philips
> videorecoders) are easily accessible on my Iyonix and my Linux boxes. But
> others (Panasonic recorders) are fine on the Iyonix but need me to take an
> action like modifying /etc/fstab to over-rule permissions to be fully
> accessible with Linux.
>
> I am using cdfs (normally) on the Iyonix, and running Xubuntu 11.10 on
> Linux.
>
> I'd assumed until recently that the Iyonix/RO was able to access the discs
> because RO file 'permission' and 'ownership' is more basic than for Linux.
> But it has occurred to me that there may be an alternative reason which
> prompts my question.
>
> What filing system does cdfs use to access a video DVD?
I didn't think RISC OS as standard could access video DVDs at all!
> Not sure which group to raise this on, so I chose misc...
>
> I have a number of home-recorded Video DVDs. Some (recorded on Philips
> videorecoders) are easily accessible on my Iyonix and my Linux boxes. But
> others (Panasonic recorders) are fine on the Iyonix but need me to take an
> action like modifying /etc/fstab to over-rule permissions to be fully
> accessible with Linux.
>
> I am using cdfs (normally) on the Iyonix, and running Xubuntu 11.10 on
> Linux.
>
> I'd assumed until recently that the Iyonix/RO was able to access the discs
> because RO file 'permission' and 'ownership' is more basic than for Linux.
> But it has occurred to me that there may be an alternative reason which
> prompts my question.
>
> What filing system does cdfs use to access a video DVD?
AIUI it can access DVD ROM/RAM data CDs but not Video DVDs
Presumably the Video DVD player that Spellings (Adrian Lees) had suitable
drivers.
> According to the DVD Video specs, the discs should contain at least two
> different filers. One is the a form of UDF, the other iso9660. (Ok, it is
> more complex than that!) I know that the Linux machine tries UDF and uses
> that if present, only then defaulting to iso. So if the Iyonix/RO uses iso,
> not UDF that might explain the 'problem' on Linux being due to something in
> the UDF filer info that is absent from the iso info.
>
> So what does cdfs (and cdromfs) do when presented with a disc with more
> than one filer system on offer?
--
CJE Micro's / 4D 'RISC OS Specialists'
Telephone: 01903 523222 Fax: 01903 523679
ch...@cjemicros.co.uk http://www.cjemicros.co.uk/
78 Brighton Road, Worthing, West Sussex, BN11 2EN
The most beautiful thing anyone can wear, is a smile!
Jim Lesurf
Jul 4, 2012, 4:13:37 AM7/4/12
to
In article <ant03124...@client.cjemicros.co.uk>, Chris Evans
meaning assumed for 'access'. :-)
If I put a DVD Video (be it commercial or home-recorded on a DVD
Videorecorder) into the DVD drive on my Iyonix then cdfs will let me open a
filer window showing the contents (directories/files).
And for home recorded discs I can then use ffmpeg to do things like extract
an audio track from one of the 'VOB' files that contain the AV data. And
the ffmpeg player will play them. And ffmpeg can be used to generate mpeg
versions which play with other RO apps. However this is all much sloooower
than doing the same on a Linux box for hardware reasons.
It can't make sense of CSS-scrambled Video recordings, though. That isn't
really the fault of cdfs!
And some versions of cdfs will only show upper-case filenames. But that
doesn't prevent being able to read the files.
However it looks like cdfs uses the iso9660 filer on DVDs. This *may* be
why it accesses some -RW discs that (out of the box) some Linux distros
show as having 'inaccessible' directories for permissions reasons.
Video DVDs have (normally) both an iso9660 filer structure *and* a UDF one.
Both actually mininal partial versions. But by default Linux goes for udf
as being a 'better' filer.
<ch...@cjemicros.co.uk> wrote:
> In article <52a650d...@audiomisc.co.uk>, Jim Lesurf
> <URL:mailto:no...@audiomisc.co.uk> wrote:
> >
> > What filing system does cdfs use to access a video DVD?
> I didn't think RISC OS as standard could access video DVDs at all! AIUI
> it can access DVD ROM/RAM data CDs but not Video DVDs
Yes, it can access Video DVDs. However we do need to take care with the
> In article <52a650d...@audiomisc.co.uk>, Jim Lesurf
> <URL:mailto:no...@audiomisc.co.uk> wrote:
> >
> > What filing system does cdfs use to access a video DVD?
> I didn't think RISC OS as standard could access video DVDs at all! AIUI
> it can access DVD ROM/RAM data CDs but not Video DVDs
meaning assumed for 'access'. :-)
If I put a DVD Video (be it commercial or home-recorded on a DVD
Videorecorder) into the DVD drive on my Iyonix then cdfs will let me open a
filer window showing the contents (directories/files).
And for home recorded discs I can then use ffmpeg to do things like extract
an audio track from one of the 'VOB' files that contain the AV data. And
the ffmpeg player will play them. And ffmpeg can be used to generate mpeg
versions which play with other RO apps. However this is all much sloooower
than doing the same on a Linux box for hardware reasons.
It can't make sense of CSS-scrambled Video recordings, though. That isn't
really the fault of cdfs!
And some versions of cdfs will only show upper-case filenames. But that
doesn't prevent being able to read the files.
However it looks like cdfs uses the iso9660 filer on DVDs. This *may* be
why it accesses some -RW discs that (out of the box) some Linux distros
show as having 'inaccessible' directories for permissions reasons.
Video DVDs have (normally) both an iso9660 filer structure *and* a UDF one.
Both actually mininal partial versions. But by default Linux goes for udf
as being a 'better' filer.
0 new messages