Implement support for .avi files, via ffmpeg

- This commit introduces optional dependencies (namely ffmpeg):
  mat2 will spit a warning when trying to process an .avi file
  if ffmpeg isn't installed.
- Since metadata are obtained via exiftool, this commit
  also refactors a bit our exfitool wrapper.

1 files changed, 2 insertions, 0 deletions

diff --git a/libmat2/parser_factory.py b/libmat2/parser_factory.py
index 621640b..4a0ca0d 100644
--- a/libmat2/parser_factory.py
+++ b/libmat2/parser_factory.py
@@ -18,6 +18,8 @@ def __load_all_parsers():
             continue
         elif fname.endswith('__init__.py'):
             continue
+        elif fname.endswith('exiftool.py'):
+            continue
         basename = os.path.basename(fname)
         name, _ = os.path.splitext(basename)
         importlib.import_module('.' + name, package='libmat2')