- pay attention to the correct chroma sample positions
- heif_image now holds a list of decoding warnings
- use AOM AOM_USAGE_ALL_INTRA mode instead of AOM_USAGE_GOOD_QUALITY
- 'strict' decoding mode with more checks for standard conformity of input
- support for EXIF data >64k in JPEG output
- proper library initialization and cleanup
- separate quality settings for alpha channel (AOM)
- improve color conversion speed (no lroundf)
- build and packaging fixes