InternalReadonlyoriginalReadonlysongThe song file as the CDN serves it (an MP4 on the song's own timeline: its fragments carry the song's timestamps), whole or holding at least the chosen segment.
ReadonlysongThe song's length, in milliseconds (the track's duration_in_ms).
ReadonlysongThe song's gain, gainOfVolumeSlider of the song slider.
ReadonlysongThe chosen start in the song, in milliseconds (audio_asset_start_time_in_ms).
Optional ReadonlytimeoutHow long FFmpeg may run, in real milliseconds; five minutes when absent. A test states a short one.
ReadonlyvideoThe developer's video: a non-fragmented MP4 with one video track and, optionally, its own sound in
AAC or PCM. Any other file is refused with ReelAudioMixError.
The original sound's gain,
gainOfVolumeSliderof the original-audio slider.