sigal - pillow issue with this addon

[Simon566]

Hi,

when running this with a single heic image with the static image generation (sigal) which uses pillow then i get:

INFO: Using 4 cores
DEBUG: Albums:
dict_values([(path='.', title='test')])
INFO: IMG_20210724_155951.jpg exists - skipping
Traceback (most recent call last):
File "/home/simon/py_sigal/./bin/sigal", line 8, in
sys.exit(main())
File "/home/simon/py_sigal/lib/python3.9/site-packages/click/core.py", line 1137, in call
return self.main(*args, **kwargs)
File "/home/simon/py_sigal/lib/python3.9/site-packages/click/core.py", line 1062, in main
rv = self.invoke(ctx)
File "/home/simon/py_sigal/lib/python3.9/site-packages/click/core.py", line 1668, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/home/simon/py_sigal/lib/python3.9/site-packages/click/core.py", line 1404, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/home/simon/py_sigal/lib/python3.9/site-packages/click/core.py", line 763, in invoke
return __callback(*args, **kwargs)
File "/home/simon/py_sigal/lib/python3.9/site-packages/sigal/init.py", line 157, in build
gal.build(force=force)
File "/home/simon/py_sigal/lib/python3.9/site-packages/sigal/gallery.py", line 756, in build
for status in self.pool.imap_unordered(worker, media_list):
File "/usr/lib/python3.9/multiprocessing/pool.py", line 870, in next
raise value
File "/usr/lib/python3.9/multiprocessing/pool.py", line 537, in _handle_tasks
put(task)
File "/usr/lib/python3.9/multiprocessing/connection.py", line 211, in send
self._send_bytes(_ForkingPickler.dumps(obj))
File "/usr/lib/python3.9/multiprocessing/reduction.py", line 51, in dumps
cls(buf, protocol).dump(obj)
TypeError: cannot pickle 'module' object
(py_sigal) simon@odroidh2:~/py_sigal$

Is this familiar ? Any tip ?

[mara004]

I think the issue here is that we are in a multiprocessing context, but certain objects are not picklable (this however is a requirement for multiprocessing). Though I'm not sure whether this is at all related to pyheif-pillow-opener. Does the issue also happen with other kinds of PIL images, or is it really limited to HEIF?