Re: [Openexr-devel] bug in exrmaketiled / lib?

[Axel Waggershauser]

On Thu, 2004-05-27 at 21:40, Florian Kainz wrote:
> Axel Waggershauser wrote:
> > Hi,
> > 
> > I have come across some weired problems with tiled images created by
> > exrmaketiled: sometimes the resulting image can not be opened with the
> > error "Unexpected tile x coordinate." and sometimes some tiles seem to
> > be written only partial, i.e. part of them is black. What makes it all
> > even weirder is that it is not reliably repeatable.
> > 
> > It might well be that my machine about to break (although I have no
> > problems other than these).
> > 
> > Has anyone ever experienced something like that?
> > 
> > Could it be that this is caused by the fact that I call exrmaketiled
> > with the system() C function from inside another program?
> > 
> 
> 
> I have not seen exrmaketiled behave this way.
> 
> Do you have an input file that makes exrmaketiled fail consistently,
> or at least most of the time?  If so, send me the file, and I'll
> try to reproduce the error.

No, I don't. It happened about 3 times out of 20 trials with different
files and when I repeated it with a file that failed first it always
worked. I'll try to get a better feeling in wich circumstances this
behavior occurs and try to reproduce it.

> Are the input files very large?  Is exrmaketiled possibly running
> out of memory, or out of disk space?  In this case, the program
> should abort with an error message, but I have been testing exrmaketiled
> on a machine with lots of RAM and file space, so I don't know for
> sure what happens.

The file size is 4096x4096 pixels of type half and I have 500M ram and
1G swap, I don't think its an out of memory problem.

> What operating system are you using?

I am using Debian testing, i.e. the used lib version is 1.1.1 since
there is no 1.2 package available, yet. But as I understand there is no
significant difference between 1.1.1 and 1.2, right?

I didn't really expect anyone to have come across this problem, but the
chance was worth the mail.

Thanks,
Axel.