{"action":"created","comment":{"url":"https://api.github.com/repos/google/spatial-media/pulls/comments/68803163","id":68803163,"diff_hunk":"@@ -13,13 +13,44 @@ GitHub.*\n ### MP4 (ISOBMFF)\n Spherical video metadata is stored in a new box, `sv3d`, defined in this RFC, in\n an MP4 (ISOBMFF) container. The metadata is applicable to individual video\n-tracks in the container.\n+tracks in the container. Since many spherical videos are also stereoscopic, this\n+RFC also defines an additional optional box, `st3d`, to specify metadata specific\n+to stereoscopic rendering.\n \n As the V2 specification stores its metadata in a different location, it is\n possible for a file to contain both the V1 and V2 metadata. If both V1 and V2\n metadata are contained they should contain semantically equivalent information,\n with V2 taking priority when they differ.\n \n+#### Stereoscopic 3D Video Box (st3d)\n+##### Definition\n+Box Type: `st3d`  \n+Container: Video Sample Description box (e.g. `avc1`, `mp4v`, `apcn`)  \n+Mandatory: No  \n+Quantity: Zero or one\n+\n+Stores additional information about stereoscopic rendering in this\n+video track.","path":"docs/spherical-video-v2-rfc.md","position":22,"original_position":22,"commit_id":"f6bf328cb8bc888e6d95f4c60a97891cd5541cce","original_commit_id":"f6bf328cb8bc888e6d95f4c60a97891cd5541cce","user":{"login":"suderman-google","id":10090641,"avatar_url":"https://avatars.githubusercontent.com/u/10090641?v=3","gravatar_id":"","url":"https://api.github.com/users/suderman-google","html_url":"https://github.com/suderman-google","followers_url":"https://api.github.com/users/suderman-google/followers","following_url":"https://api.github.com/users/suderman-google/following{/other_user}","gists_url":"https://api.github.com/users/suderman-google/gists{/gist_id}","starred_url":"https://api.github.com/users/suderman-google/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/suderman-google/subscriptions","organizations_url":"https://api.github.com/users/suderman-google/orgs","repos_url":"https://api.github.com/users/suderman-google/repos","events_url":"https://api.github.com/users/suderman-google/events{/privacy}","received_events_url":"https://api.github.com/users/suderman-google/received_events","type":"User","site_admin":false},"body":"Don't we want to avoid fallback / default value behavior? I'm concerned about users including the sv3d box but not the st3d hoping the fallback in monoscopic 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