JPEGImage(<filename>) hangs

[Chris Green]

Chris Green <cl at isbd.net> wrote:
> Brian Oney <brian.j.oney at googlemail.com> wrote:
> > Could you please try another tool like `convert'? E.g.
> > 
> > $ convert 102_PANA/P1020466.JPG test.png
> > 
> > 
> > What does that say?
> 
> Well, after having returned home with the laptop where this was
> failing and doing exactly the same thing again, it now works.  However
> it did take several seconds before the >>> prompt appeared.
> 
> The problem seems to be intermittent as I'm calling the function while
> importing images from a camera SD card and, sometimes, the import
> hangs but most times it works OK.
> 
> I'll see if I can see anything common to when it hangs.
> 
... and the result is that it now hangs several images later in the
sequence!  It's almost as if some resource is running out.

If I try convert on the 'problem' image it too hangs absolutely
solidly needing a 'kill -9'.

After some experimentation....  OK, it's some sort of file
accessibility problem between the SD card and the computer:-

    Running 'convert 102_PANA/P1020493.JPG /tmp/xyz.png' hangs

    So 'kill -9' the convert

    Run 'cp 102_PANA/P1020493.JPG /tmp/fred' takes several seconds but returns

    Running 'convert 102_PANA/P1020493.JPG /tmp/xyz.png' now works

    My python program that uses jpegtran now also works OK

Wierd!  However it would seem it's not an issue with Python or the
jpegtran module.

-- 
Chris Green
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