Extract metadata from Canon CR2 and Nikon NEF raw files

rawextract.py

#!/usr/bin/env python

import sys
import os
from rawphoto.cr2 import Cr2
from rawphoto.nef import Nef


def print_entries(raw, ifd, level=1):
    for name in ifd.entries:
        e = ifd.entries[name]
        if name in ifd.subifds or isinstance(name, tuple):
            if isinstance(name, tuple):
                for n in name:
                    print(level * "\t" + n + ":")
                    print_entries(raw, ifd.subifds[n], level + 1)
            else:
                print(level * "\t" + name + ":")
                print_entries(raw, ifd.subifds[name], level + 1)
        else:
            if isinstance(name, str):
                if e.tag_type_key is 0x07:
                    print(level * "\t" + "{}: {}".format(
                        name,
                        "[Binary blob]"
                    ))
                else:
                    print(level * "\t" + "{}: {}".format(
                        name,
                        ifd.get_value(e)
                    ))

metadata = {}
filepath = sys.argv[1]
(filepath_no_ext, ext) = os.path.splitext(filepath)
filename_no_ext = os.path.basename(filepath_no_ext)
ext = ext.upper()
if ext == '.CR2':
    raw = Cr2(filename=filepath)
elif ext == '.NEF':
    raw = Nef(filename=filepath)
else:
    raise TypeError("Format not supported")
for i in range(len(raw.ifds)):
    ifd = raw.ifds[i]
    print("IFD #{}".format(i))
    print_entries(raw, ifd)
    # Hax.
    for subifd in ifd.subifds:
        if isinstance(subifd, int):
            print("Subifd ", subifd)
            print_entries(raw, ifd.subifds[subifd], 1)
with open(filename_no_ext + "_thumb.jpg", "wb") as outfile:
    try:
        outfile.write(raw.thumbnail_image)
        print("Wrote {}_thumb.jpg to disk...".format(filename_no_ext))
    except:
        pass
with open(filename_no_ext + "_preview.jpg", "wb") as outfile:
    try:
        outfile.write(raw.preview_image)
        print("Wrote {}_preview.jpg to disk...".format(filename_no_ext))
    except:
        pass
with open(filename_no_ext + "_uncompressed.jpg", "wb") as outfile:
    try:
        outfile.write(raw.uncompressed_full_size_image)
        print("Wrote {}_uncompressed.jpg to disk...".format(filename_no_ext))
    except:
        pass
with open(filename_no_ext + "_raw.data", "wb") as outfile:
    outfile.write(raw.raw_data)
    print("Wrote {}_raw.data to disk...".format(filename_no_ext))
raw.close()

Hi ! I try to get the exposure time of my pictures with your code but I got 1004 instead of 90.2 s. Any Idea about where this difference come from ?
Cheers

Sorry, I haven't looked at this in years and we no longer maintain rawkit, so I'm afraid it's not something I can help with.