Tech specs

What B/side runs on, what it opens and what it sends out. If something you need is not listed, ask us before you assume either way.

Where it runs

Browser: B/side is supported in Google Chrome and Microsoft Edge, kept up to date, on macOS and Windows.
Safari and Firefox: Not supported. B/side tells you so when you open it there, rather than letting you find out on a deadline.
Desktop helper: A/Side runs on the Mac or PC your drives are plugged into. It only makes outbound connections.
If the connection drops: Keep cutting. A banner tells you, and your edits wait on your computer until it is back. In Chrome, a project you have opened on this computer before still opens if you reload. Ingesting new footage and seeing other people's edits wait for the connection. Live status is at status.bside.video.

Footage

Ingest: Drop a card, a folder or a file into the app: .mp4, .mov, .m4v, .mxf, .mts, .m2ts, .avi, .braw, .r3d, .ari, .dng.
Camera formats: ProRes, camera RAW (R3D, BRAW, ARRIRAW) and most MXF come in through the desktop helper, which the app brings with it.

Frame rates: 23.976, 24, 25, 29.97 drop-frame, 29.97 non-drop, 30, 50, 59.94 drop-frame, 59.94 non-drop, 60
Timecode: Drop-frame timecode is exact across a full day. Every position on the timeline is a whole frame.

Track formats: Mono, stereo, 5.1 and 7.1 on the timeline, mixed and exported as stereo
Microphone names: Read from multitrack recorder files and shown on every channel, on Creator and up

Dailies lists: ALE, on every plan
Another editor’s project: Avid AAF, Avid bin and Premiere Pro project, on Creator and up
Whole Avid project folder: On Production

Your cut: H.264 at 1080, 720 or source size, and frame grabs, on every plan
Loudness: Web and vertical exports come out at −16 LUFS, a common level for streaming, on every plan. It is set with one volume change for the whole file and never turned up into clipping.
YouTube chapters: Exports for YouTube come with a chapter list made from your markers, ready to paste into the description. You pick which colour of marker are your chapters, so your notes stay out. On every plan.
Subtitles: Sidecar files (SRT, VTT, SCC), or captions burned into the picture
To sound and colour: AAF, EDL and change lists, on Editor seat and Production
Masters: ProRes 422 HQ through the desktop helper, on Editor seat and Production
Sound in a master: A master’s channels laid out from the mix, the stems or single tracks, up to 16
Collect Hi-Res: Gather just the footage your cut uses, with a second either side of each shot, to the cloud or to a folder on one computer. Then export from anywhere with the drives unplugged. Footage collected to the cloud counts toward your storage.

Specifications as of October 2026, during early access. They will grow; this page will say so when they do.