Peter Pearson <pkpearson@nowhere.invalid> wrote: > On Fri, 28 Sep 2018 15:01:41 +0100, Chris Green <c...@isbd.net> wrote: > > Chris Green <c...@isbd.net> wrote: > >> Brian Oney <brian.j.o...@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 > [snip] > > If copying that particular file takes longer than copying other files, > I'd start to suspect that it's stored in a failing spot in memory. Is > 102_PANA/P1020493.JPG being read from a camera's flash memory? Does > "convert" hang on /tmp/fred? Does 102_PANA/P1020493.JPG have an unusual > size? Can you use smartctl to ask the storage device if it's > encountering many errors? > Thanks, that sounds like a good explanation. The SD card has been in use for quite a while so it might have some problems. I think I'll retire it and see how things go.
-- Chris Green ยท -- https://mail.python.org/mailman/listinfo/python-list
