pyexiv2-developers team mailing list archive

[Iform <iform@xxxxxxxx>]

On 05/11/2010 08:20 AM, Olivier Tilloy wrote:

>  Hello,
>
>  Your description of the issue suggests that it may very well be an issue
>  in pyexiv2 itself.
>  It would help a lot the investigation if you could let us know what
>  version of pyexiv2 you are using, and provide your script or a minimal
>  script that reproduces this behaviour.
>
>  Note that pyexiv2 0.2.0 had a nasty memory leak that was fixed in
>  pyexiv2 0.2.1, could that be the same issue?
>
>  Cheers,
>
>  Olivier
>
>
>  On 2010-05-11, S. J.<iform@xxxxxxxx>   wrote:
>
> >  Hi,
> >
> >  I have written a small python app that uses the pyexiv2 library.
> >  However, when running the app, I see an interesting behavior.
> >
> >  My app walks through a directory and its subfolders, renaming each file
> >  according to it exif data metadata.  It also writes the old filename to
> >  the xmp metadata fields as keywords.  The at first the app functions
> >  normally, memory usage is under control, the processor barely being used
> >  and near constant file I/O.  However, it came to a point where memory
> >  usage climbs, processor is maxed at 50% (only using one core). and disk
> >  I/O is very sporadic.
> >
> >  I get error messages to the console such as the below....
> >
> >  Warning: Directory NikonPreview, entry 0x0201: Data area exceeds data
> >  buffer, ignoring it.
> >
> >
> >  I am wondering what might be causing this.  I cannot reproduce the error
> >  or the conditions using the exiv2 binary for windows.  It seems to read
> >  all the metadata without errors.  So I am not sure whether this is a bug
> >  in exiv2 or pyexiv2.
> >
> >  -Please Help
> >  iform
Hi,

After running a few more tests...it looks like the culprit is not
reading the metadata, but writing it.

Included is a sample script that has the writeTags function of my app.

Behavior is observed using pyexiv2 .21

Hope this helps
iform



import subprocess
import os,datetime
import pyexiv2
import gapclasses

def callExiv2(file):
    rcode = subprocess.call(["exiv2", "-pa", file])
    print "exiv2: %s" % rcode

def writeTags(filePath, relativePath, artistString=""):
    """Write EXIF artist tag to copied file"""
    print "\n\nEntered gapclasses.writeTags"
    keywords = []
    newT = pyexiv2.ImageMetadata(os.path.abspath(filePath))

    try:
        print "Reading data first try %s"%filePath
        newT.read()
        newT['Exif.Image.Artist'].value
        print "Read Success: %s"%filePath
    except KeyError:
        #Program will NOT remove existing values
        print "Setting artist string"
        newT['Exif.Image.Artist'] = artistString
        print "Set artist string"
        print "Generating Keyword List"
        keywords = os.path.normpath(relativePath).split(os.sep)
        print "Keyword list generated"
        try:
            print "Getting existing keywords"
            existingKeywords = newT['Xmp.dc.subject'].value
            print "Got keywords...now appending keyword list"
            newT['Xmp.dc.subject'] = existingKeywords + keywords
        except KeyError:
            print "KeyError...no existing keywords. Setting keywords"
            newT['Xmp.dc.subject'] = keywords
    except IOError:
        print "Unsupported file Type"


    print "FYI: Starting to attempt writing %s"%filePath
    try:
        print "Attempting to write all the data"
        print newT.write()
        print "Wrote data SUCCESSFUL %s"%filePath
    except:
        print "Write Failed!\n"

topdir = os.path.abspath("/home/ryan/testRAW")

for path, dirs, file in os.walk(topdir, topdown=False):
    for f in file:
        #callExiv2(os.path.join(path,f))
        fileName = os.path.join(path,f)
        writeTags(fileName, os.path.relpath(fileName), "Ryan Grout")