Can not support using copy of raw photo as thumbnail for some photos

[bafu]

Related issue: #14

Steps to Reproduce

bafu@bafu-XPS-13-7390  ~/codes/starling-cai/utils   master  sha256sum scott.jpg 
55146f1665fa84fe2a76d13772f7f83ea02a188cde68a047cb9acd2e28005d90  scott.jpg

bafu@bafu-XPS-13-7390  ~/codes/starling-cai/utils   master  cp scott.jpg scott-thumbnail.jpg 

bafu@bafu-XPS-13-7390  ~/codes/starling-cai/utils   master  python3 starling_multiple_injection.py scott.jpg 
Traceback (most recent call last):
  File "starling_multiple_injection.py", line 173, in <module>
    photo_bytes = starling.cai_injection()
  File "/home/bafu/codes/starling-cai/cai/starling.py", line 180, in cai_injection
    cai_data_bytes = self.multiple_claims_injection()  File "/home/bafu/codes/starling-cai/cai/starling.py", line 175, in multiple_claims_injection
    cai_data_bytes = insert_xmp_key(data_bytes, store_label=self.store_label)
  File "/home/bafu/codes/starling-cai/cai/core.py", line 93, in insert_xmp_key
    metadata.write()
  File "/home/bafu/.local/lib/python3.8/site-packages/pyexiv2/metadata.py", line 127, in write
    self._image._writeMetadata()
OSError: Input data does not contain a valid image

If we create a thumbnail with smaller size, injection can be done successfully:

bafu@bafu-XPS-13-7390  ~/codes/starling-cai/utils   master  convert -resize 100x100 scott.jpg scott-thumbnail.jpg 

bafu@bafu-XPS-13-7390  ~/codes/starling-cai/utils   master  python3 starling_multiple_injection.py scott.jpg 

Raw photo

• 

Environment

• starling-cai: v1.3.1
• Python: 3.8.2

[bafu]

This issue is fixed by v1.3.2.

There is a potential performance issue in this scenario.

The size of the example image above is ~5.7 MB, and every injection will add 2 thumbnails and increase 11.4 MB in total size. The injection takes ~28s, and my notebook CPU is 12-core Intel(R) Core(TM) i7-10710U CPU @ 1.10GHz.

# 6-injection test

$ time python3 james_multiple_injection.py scott-1.jpg
...
python3 james_multiple_injection.py scott-1.jpg  28.37s user 28.71s system 99% cpu 57.104 total