Action Details
Requirements and how-to articles for Facebook's action:

Requirements
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Caption (optional)
You can add a text caption to accompany your 360 video if you wish.
360 Video
File format: .mp4/.mov
Maximum file size: 10GB (larger files can be uploaded but may experience longer upload and processing times.)
Maximum video length: Recommended up to 30 minutes (longer videos may experience longer processing times.)
Codec: h.264
Maximum resolution: 5120 x 2560 pixels (monoscopic) 5120 x 5120 pixels (stereoscopic)
Aspect ratio: 2:1 (monoscopic) 1:1 (stereoscopic)
Frame rate: 30fps (frames per second)
Bitrate: Up to 45Mbps for 4K videos (recommended 25-60 Mbps overall.)
Pixel format: YUV 420p
Projection Format: Equirectangular/Cubemap
Audio: .aac codec at 128 Kbps
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