Subject: [Cellar] spherical video+

From: Dave Rice <[email-masked]>
Date: Wed, 6 Apr 2016 16:54:20 -0400

Hi all,

I recently saw the RFC draft work at https://github.com/google/spatial-media/blob/master/docs/spherical-video-rfc.md.

Regarding the combination of frame cropping and stereo mode it clarifies: "Cropping, initial view, and projection properties are shared across the left/right eyes. Each video frame is divided into the left/right eye regions then cropping and view information is applied treating each region as a separate video frame." Is this considered true for Matroska. From my reading of the current Matroska spec I would presume that the PixelCrop* elements refer to the overall frame regardless of StereoMode data.

Also this document proposes storing spherical video metadata in XML form in the Tags elements instead of in EBML sub-elements of the Video Element. Is anyone aware of this project? Or is it worthwhile to collaborate to include the considerations of this document within current Matroska specification efforts.

Best Regards,
Dave Rice