MP4, MOV, WebM, MKV, OGG, WAV, MP3, AAC, H264, Theora, VP8, VP9
For more information about supported formats/codecs, see here: https://www.chromium.org/audio-video
Unsupported files can now be recomposed (quickly) or encoded (slowly) into a friendly format/codec from the File menu. The processed version will open in the player. Cropping will still be performed using the source file as input, that is, lossless. Potentially, this makes it possible to open any file that FFmpeg can decode.