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Old 05-28-2009, 02:38 PM   #1
maxque
LQ Newbie
 
Registered: Apr 2005
Location: Vancouver
Distribution: Debian
Posts: 28

Rep: Reputation: 15
Jpegs show as NOT jpeg files on hybrid iso9660/hfs cdrom and DVDs


No other similar threads seem to have encountered this problem. I take a lot of digital images. They range in side from 1 - 4 megabyte to. I use Image Capture on MacOS X 10.4/10.5 to down load up to a gig and a half of images each session. ALL the .JPG files from my Canon SX1000 are valid .JPG files when downloaded.

I burn them off to a dvd when I can fill a DVD with images. The images are all good when viewed on Mac OS X or on a Windows machine. So I know the hybrid file systems are working correctlty.

I had problems mounting hybrid DVD or CDROMS in Linux until I installed HFS/HFS+ untils. At that point I had no more problems mounting these hybrid cdroms.

The problem nos is that if I try to download images from my camera directly to Linux, they will not all download. If I try to view all the files I'v burned to DVD as a hybrid file system I get this error

Code:
Error interpreting JPEG image file (Not a JPEG file: starts with 0x00 0x00)
All these files are valid jpeg files. All of them open on Mac OS X and all of htem are viewable in the camera itself. What is happening here? Why is Linux the only system on which I cannot view or use these images. Personally I'd prefer to be using tiff or png files but jpeg is what is available to me with this model of Canon camera so I'm stuck. I'm not dissatisfied with the quality of jpeg. I think they are high enough qualityy that there is no lossy compression being done.

What is the problem and how can it be remedied?

Cheers,
Maxque

Hardware: eeepc 1000 (SD hard drives)
Processor:Intel Atom 1.6 ghz
Kernel 2.6.27-8-eeepc
 
Old 05-30-2009, 10:19 AM   #2
maxque
LQ Newbie
 
Registered: Apr 2005
Location: Vancouver
Distribution: Debian
Posts: 28

Original Poster
Rep: Reputation: 15
replying to my own post about jpegs on hybrid cd's

I'm guessing that neither mac os x or Windows which ever one, reads both file systems.


If I had to read HFS+ and NTFS filesystems and correlate them at the same time I think I'd go crazzy and have to be locked up in the loooney bin. But I have an idea this is what Linux is trying to do rathe than mount either one or the other.

However, I think this will take some actual prgramming which I cannot do. It should say something like:a

If CDROM or DVD ROM is hypbrid and
if media (CDROM DVDROM) is data

then Mount (one or the other) file system.

ask user which file system:

mount file system chosen by user.

end

both the dual file systems on hybrid cdroms and dvdroms would have to be entered in /etc/fstab as well as the optional entrys for one or the other file system.

With Fuse, Linux is now capable of dealing with mnultiple file systems at the same time.ou

THere is no logival reason why Linux cannot deal lwith both iso9660 and HFS+..

I think Linux --- Ubuntu especially caters almost excvlusively to the Windows crowd being that these are the largest group of users you wish to capture.

that said, you have a growing number of Apple machiens which are being made incapable of running newer versions of Mac OS X and these are very likely people who would put linux on these systems in the future. I am one of them... its just that mostly Linux ignores us Mac useers so thingss like netatalk are almost but not quite ready for prime time. Things like hfs+ utils are good as far as they go, documentation understandable by us mere mortals is in short supply.

Am I on the right track here?

cheers,
davidf
 
  


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