ffmpeg speedup, windows path fix, season fingerprint for new episodes, repair mode

[mueslimak3r]

Changes

• speeds up ffmpeg by getting 2 frames for every second of video instead of getting every frame

• speeds up fingerprint processing by storing frame hashes as a list of ImageHash objects

• improve accuracy by use hamming for frame fingerprint comparison instead of just doing equality comparison

• corrected some math

• support comparing video segments of different lengths. This is used to compare episodes to season fingerprints, and during error correction

• save season fingerprint so it can be used to process new episodes

• changed structure of season fingerprint so its version can be checked and the hash fps the fingerprint was encoded at is known

• added logic for validating a season hash against the current specs, and for recreating it if needed

• fixed handling of windows file paths when used on other operating systems or in docker

• added --repair mode which can reprocess episodes with start and end times of 00:00,00:00 (failed the first time)

• added the diff_jellyfin_cache utility for comparing two jellyfin_cache folders to list the differences

Issues fixes #17