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@noah
Created January 4, 2017 16:26
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Count unique EXIF tags
def grouper(iterable, n, fillvalue=None):
args = [iter(iterable)] * n
return izip_longest(*args, fillvalue=fillvalue)
# read exif data and build a list of unique keys
media_files = []
for root, sub_folders, files in walk(app.config['MEDIA_ROOT']):
for f in files:
media_files.append(path.join(root, f))
chunksize=512
lm = len(media_files)
ng = lm / chunksize
exif_keys = {}
with ExifTool() as et:
print "Examining {} files ({} groups)".format(lm, ng)
for i, group in enumerate(grouper(media_files, chunksize)):
group = filter(None, group)
print "group #{}/{} group sz: {}".format(i, ng, len(group))
metadata = et.get_metadata_batch(group)
for entry in metadata:
for k,v in entry.items():
if k in exif_keys: exif_keys[k] += 1
else: exif_keys[k] = 1
print "Found {} keys".format(len(exif_keys))
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