anought> Videos (MP4, M4V, MOV, WebM) up to 99MB. Video will be transcoded to H.264 MP4 with a maximum bitrate of 1300kbps and framerate of 120fps. Only one video can be attached, per post.
> Audio (MP3, OGG, WAV, FLAC, OPUS, AAC, M4A, 3GP) up to 99MB. Audio will be transcoded to MP3 using V2 VBR (roughly 192kbps). Only one audio file can be attached, per post.
https://docs.joinmastodon.org/user/posting/#media