Audio and video

mp3 wav m4a aac aiff flac ogg opus bwf 3gpp, video as mp4 mov mkv webmavi, and MIDI as mid midi

Audio and video play in place, with the app's own player and its own decoders: H.264, HEVC, VP9 and AV1 pictures; AAC, MP3, FLAC, Opus, Vorbis and PCM sound. Nothing has to be installed, and no codec is fetched.

Structure mode walks the container a sound came in — the MPEG frames of an mp3, the chunks of a wav, the boxes of an m4a — each one with its offset, its bitrate and its size. It answers what a player never shows: how the file is actually put together.

MIDI

A MIDI file opens playing: the app's own synthesizer sounds its notes at the file's tempos, a piano-like tone for every instrument and drums on the percussion channel, on every platform.

Its table holds a row for each event: the track, the tick and the time, what kind of event it is, the channel, the note and its velocity, a controller and its value, and any text. Structure mode shows its header — the format, the track count, the ticks to a quarter note — and every track with its name and how many events of each kind it holds.

Next: fonts.