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Handle thumbnail creation of video files correctly

See original GitHub issue

On the commit https://github.com/LibrePhotos/librephotos/commit/187cfa2da9c04330cbe3402ad4b2ebd3408aff23 is_valid_media is remove then all file are processed.

On my folder there is mp4 video are processed with the bellow error :

20200118_195052.mp4

reason: delegate failed `'ffmpeg' -nostdin -v -1 -i '%i' -vframes %S -vcodec pam -an -f rawvideo -y '%u.pam' 2> '%u'' @ error/delegate.c/InvokeDelegate/1966
Traceback (most recent call last):
  File "/usr/lib/librephotos/backend/api/directory_watcher.py", line 90, in handle_new_image
    photo._generate_thumbnail()
  File "/usr/lib/librephotos/backend/api/models/photo.py", line 132, in _generate_thumbnail
    with Image(filename=self.image_path) as img:
  File "/usr/lib/librephotos/.local/lib/python3.9/site-packages/wand/image.py", line 9110, in __init__
    self.read(filename=filename)
  File "/usr/lib/librephotos/.local/lib/python3.9/site-packages/wand/image.py", line 9705, in read
    self.raise_exception()
  File "/usr/lib/librephotos/.local/lib/python3.9/site-packages/wand/resource.py", line 222, in raise_exception
    raise e
wand.exceptions.DelegateError: delegate failed `'ffmpeg' -nostdin -v -1 -i '%i' -vframes %S -vcodec pam -an -f rawvideo -y '%u.pam' 2> '%u'' @ error/delegate.c/InvokeDelegate/1966

After install ffmpeg

20200118_195052.mp4

reason: cache resources exhausted `/tmp/magick-RKvHmvmInW9R3NWGXP6FveysIVHoWR56.pam' @ error/cache.c/OpenPixelCache/4095
Traceback (most recent call last):
  File "/usr/lib/librephotos/backend/api/directory_watcher.py", line 134, in rescan_image
    photo._generate_thumbnail()
  File "/usr/lib/librephotos/backend/api/models/photo.py", line 132, in _generate_thumbnail
    with Image(filename=self.image_path) as img:
  File "/usr/lib/librephotos/.local/lib/python3.9/site-packages/wand/image.py", line 9110, in __init__
    self.read(filename=filename)
  File "/usr/lib/librephotos/.local/lib/python3.9/site-packages/wand/image.py", line 9705, in read
    self.raise_exception()
  File "/usr/lib/librephotos/.local/lib/python3.9/site-packages/wand/resource.py", line 222, in raise_exception
    raise e
wand.exceptions.CacheError: cache resources exhausted `/tmp/magick-RKvHmvmInW9R3NWGXP6FveysIVHoWR56.pam' @ error/cache.c/OpenPixelCache/4095