# One Video, Three Deliverables: Eclipsa Audio for YouTube, Binaural for Phones and an Archive Master > How to turn one video project into three deliverables: a YouTube upload with Eclipsa Audio, a stereo or binaural version for social and phones, and a documented archive master. Web page: https://spatial9.ai/blog/one-video-three-audio-deliverables Author: Spatial9 Team Published: 2026-11-03. Updated: 2026-11-03. ## Key takeaways - Mix the video once in immersive, then print every deliverable from that one locked session so all versions stay in sync. - For YouTube, deliver a video MP4 with stereo plus Eclipsa Audio at 48 kHz, with no edit lists and the moov atom at the front. - Social apps and phones play two channels: stereo is the safe choice for speakers, binaural for headphone listening. Label which is which. - The archive package should hold the ADM BWF master, stems, the stereo and binaural prints, the Eclipsa Audio file and a notes file at native resolution. - Check every deliverable before it leaves with the free in-browser file checker, which uploads nothing. Short answer: finish the immersive mix once, then print three things from it. First, a video MP4 that carries a stereo track and an Eclipsa Audio track for YouTube. Second, a two-channel version for social apps and phones, as stereo for speakers and binaural for headphones. Third, an archive package with the ADM BWF master, stems, the stereo and binaural prints and a notes file. All three come from the same timeline, so they stay in sync and you never mix the same video twice. Most video projects now end up in more than one place: a YouTube upload, a few vertical cuts for social, and a copy for the client's archive. Treating each as a separate job leads to three slightly different mixes and three sets of problems. This guide shows how to plan for all three from the start. ## Start from one source of truth Every deliverable should come from a single locked session: the final picture edit and one immersive mix. Agree two things before you start: - Picture lock and frame rate. Any edit after the mix moves the sound, and every deliverable then needs fixing. - The immersive format of the session. A channel bed such as 7.1.4, an object-based ADM mix, or an ambisonic scene. Ambisonics suits 360 degree video, because the sound field can turn with the viewer; see ambisonics explained. If the video only has a stereo soundtrack today, read how to make YouTube videos sound cinematic first. It covers building space into a video mix before you think about formats. ## The three deliverables at a glance | Deliverable | Container and audio | Where it goes | Main check | | 1. YouTube immersive | MP4 with stereo plus Eclipsa Audio (IAMF), 48 kHz | YouTube | Stereo and immersive tracks both present | | 2. Social and phones | MP4 or WAV with two channels: stereo, binaural or both | Social apps, messaging, client review | Correct label, sensible loudness | | 3. Archive master | ADM BWF, stems, stereo, binaural, notes | Client or label archive | Complete, documented, native rate | ## Deliverable 1: the YouTube upload with Eclipsa Audio YouTube's recommended upload encoding settings list Eclipsa Audio as an audio codec next to AAC-LC and Opus. The channel option is "Stereo + Eclipsa Audio", at 48 kHz, in an MP4 with no edit lists and the moov atom at the front of the file. YouTube recommends 128 kbps per channel for Eclipsa Audio. Eclipsa Audio is built on IAMF, the open Immersive Audio Model and Formats specification from the Alliance for Open Media. Google's open source team has described an Eclipsa Audio video on YouTube that combines third-order ambisonics with a stereo element, 18 channels in total, and noted that YouTube compresses the channels with Opus. Google's Eclipsa Audio Renderer plugin can also mux a video track with the IAMF audio, so the export is ready to upload. A practical routine: - Export the immersive mix as IAMF, or convert an existing ADM master with the free ADM to Eclipsa converter. - Mux it with the final picture into one MP4, alongside the stereo track. - Upload as private or unlisted, then check the immersive version once processing finishes. Remember that most viewers will hear the stereo track or a device render, depending on what their device supports. Our Eclipsa Audio YouTube guide covers the upload step by step. ## Deliverable 2: stereo and binaural for social and phones Social apps and messaging services play two channels. That gives you a choice for each cut: - Stereo is the safe default when people may listen on phone speakers, laptops or TVs. - Binaural is rendered for headphones. It can keep much of the sense of space from the immersive mix, but it can sound coloured or narrow on loudspeakers. If you send both, label them clearly, for example ST and BIN in the file names, and tell the client where each one belongs. The trade-offs are explained in headphone vs speaker spatial audio and binaural vs spatial audio. Vertical edits are new edits. If a 9:16 cut removes or moves scenes, conform the audio to that cut rather than trimming the full-length mix by ear, and check that no sound starts or stops abruptly at the new edit points. ### Hear the difference on headphones The player below is an illustration of what a two-channel headphone version can do. Put on headphones: it switches between the original stereo soundtrack of the Spatial9 demo video and a Spatial9 spatial version. Both are AAC two-channel files rendered for headphones. They are a binaural illustration, not a native 5.1, ADM or IAMF deliverable, so they show what deliverable 2 can sound like, not deliverable 1. ## Deliverable 3: the archive and master package The archive is what lets the client make a fourth or fifth version years from now without coming back to you. Include: - The ADM BWF master of the immersive mix, with its chna and axml chunks intact. Our ADM BWF guide explains what those chunks hold. - Stems at the session rate, all with the same start and length. - The stereo and binaural prints, so nobody has to recreate them. - The Eclipsa Audio file that went to YouTube, for reference. - A notes file with frame rate, start timecode, sample rate, channel order, loudness figures and version history. Keep the native resolution. Dolby's music delivery playbook suggests saving a 96 kHz master for archive when you worked at 96 kHz, even though deliveries are at 48 kHz. The Library of Congress Recommended Formats Statement prefers Broadcast WAVE files with embedded metadata, and files in their native resolution rather than up-sampled. ## Keep the three in sync Before anything leaves, line the deliverables up against each other: - the same first frame of picture and sound in every file; - the same length, unless a cut is deliberately different; - no drift between the stereo track and the immersive track inside the YouTube MP4; - consistent loudness between versions, measured with the ITU-R BS.1770 method. ## Check each file before it goes out Drop each deliverable into the free Spatial9 file checker. It runs in your browser and uploads nothing. It confirms what each file really is, whether that is an ADM master, an Eclipsa Audio MP4, a stereo or mono file or a video with stereo sound. It plays ADM and surround files in a virtual 7.1.4 room, lets you compare Eclipsa Audio and ambisonic files in stereo and binaural, and runs a BS.1770 loudness, true-peak and clipping check. The loudness figure is a guide, not a certified meter. ## Where Spatial9 fits, and what this guide does not cover Spatializer for Video, which pairs immersive sound with picture and exports Eclipsa Audio for YouTube, is in early access. The ADM to Eclipsa Audio converter is free today for mixes that already exist as ADM masters. This guide does not cover picture deliverables, captions, platform-specific social specs or contracts, and it does not predict how any platform will process or play your file. Always check the current help pages of each destination. ## Frequently asked questions ### Can one MP4 serve YouTube and social apps? Not reliably. YouTube's settings include a stereo plus Eclipsa Audio option, but most social apps expect a single two-channel track. Make a separate stereo or binaural file for social. ### Should the social version be binaural or stereo? If the audience mostly watches on headphones, binaural can keep more of the space. If many people listen on phone or laptop speakers, stereo is safer. When in doubt, deliver both and label them. ### Do I need to mix the video three times? No. Mix once in immersive, then render the stereo, binaural and Eclipsa Audio versions from that mix. Check the stereo fold-down by ear, because some mixes need small adjustments to translate. ### What if I only have a stereo soundtrack? You can still make deliverable 2 today. For an immersive YouTube version, you need an immersive mix first. See how to make YouTube videos sound cinematic. ## Sources - YouTube recommended upload encoding settings, YouTube Help. - Use spatial audio in 360-degree and VR videos, YouTube Help. - Introducing Open Source DAW Plugin for Eclipsa Audio, Google Open Source Blog. - Introducing Eclipsa Audio: immersive audio for everyone, Google Open Source Blog. - Immersive Audio Model and Formats (IAMF) specification, Alliance for Open Media. - ITU-R BS.2076: Audio Definition Model, International Telecommunication Union. - ITU-R BS.1770: Algorithms to measure audio programme loudness and true-peak audio level, International Telecommunication Union. - Dolby Atmos Music Delivery Playbook, Dolby Laboratories. - Recommended Formats Statement: Audio Works, Library of Congress. ## One mix, every screen Plan the three deliverables before the mix and they come almost for free at the end. Spatial9 turns ADM masters into Eclipsa Audio for YouTube today, and Spatializer for Video is in early access. Dolby and Dolby Atmos are trademarks of Dolby Laboratories. Spatial9 is not affiliated with or endorsed by Dolby Laboratories.