360 DEGREE MULTI-VIEWPORT SYSTEM

1 . A method comprising:

receiving metadata indicating which portion of a 360-degree video corresponds to a first viewport of the 360-degree video displayed on a fixed display;

tracking an orientation of a mobile device relative to the fixed display;

determining a second viewport of the 360-degree video synchronized in time and orientation relative to the 360-degree video displayed on the fixed display based on the metadata and the orientation of the mobile device relative to the fixed display; and

displaying the second viewport on the mobile device.

2 . The method of claim 1 , wherein determining the second viewport comprises:

determining a first angle from the orientation of the mobile device relative to the fixed display;

determining a second angle from a center of the first viewport of the 360-degree video displayed on the fixed display; and

orienting, for the second angle, the 360-degree video synchronized in time and space to generate the second viewport.

3 . The method of claim 1 , wherein determining the second viewport of the 360-degree video comprises determining a virtual mirror viewport of the 360-degree video.

4 . The method of claim 1 , wherein determining the second viewport of the 360-degree video comprises selecting a location of a virtual mirror corresponding to a portion of the 360-degree video displayed on the fixed display.

5 . The method of claim 4 , wherein displaying the second viewport of the 360-degree video comprises rendering a portion of the 360-degree video corresponding to the location of the virtual mirror.

6 . The method of claim 1 , further comprising:

recording an image from a front-facing camera of a mobile device to generate a recorded image; and

overlaying the recorded image on the second viewport to generate an updated second viewport,

wherein displaying the second viewport displays the updated second viewport.

7 . The method of claim 1 , further comprising:

recording an image from a front-facing camera of a mobile device to generate a recorded image; and

displaying the recorded image as an overlay over the second viewport on the mobile device.

8 . The method of claim 7 , wherein the second viewport is a virtual mirror of the first viewport.

9 . The method of claim 1 , further comprising:

selecting an object within the second viewport of the 360-degree video as a virtual mirror object,

wherein displaying the second viewport comprises replacing the virtual mirror object with a portion of the first viewport of the 360-degree video.

10 . The method of claim 1 , further comprising:

selecting an object within the 360-degree video as a virtual mirror object; and

replacing the virtual mirror object with a portion of the first viewport of the 360-degree video,

wherein displaying the second viewport comprises displaying the virtual mirror object replaced with the portion of the first viewport of the 360-degree video.

11 . The method of claim 1 , wherein the second viewport is a virtual mirror of the first viewport.

12 . The method of claim 1 , further comprising:

recording an image from a front-facing camera of a mobile device to generate a recorded image;

determining a boundary of a user in the recorded image to generate a shape of the user;

cropping the recorded image by tracing the shape of the user to generate a cropped image; and

displaying the cropped image as an overlay over the second viewport on the mobile device.

13 . The method of claim 1 , wherein determining the second viewport of the 360-degree video comprises:

capturing an image of the 360-degree video displayed on the fixed display to generate a captured image;

determining a first time instant that the captured image is captured;

determining a second time instant that a first portion of the 360-degree video corresponding to the captured image is displayed;

determining a time delay as the difference between the first time instant and the second time instant;

time-adjusting the second viewport based on the time delay to generate a time-adjusted viewport; and

displaying the time-adjusted viewport on the mobile device.

14 . The method of claim 1 , wherein tracking the orientation of the mobile device relative to the fixed display comprises:

determining a first direction of the mobile device when the fixed display is parallel to the mobile device at a first time;

determining a second direction of the mobile device at a second time;

determining a heading difference between the first direction and the second direction; and

storing the heading difference as the orientation of the mobile device relative to the fixed display.

15 . The method of claim 1 , wherein tracking the orientation of the mobile device relative to the fixed display comprises:

determining a first direction of the mobile device relative to the fixed display at a first time;

determining a second direction of the mobile device relative to the fixed display at a second time;

determining a heading difference between the first direction and the second direction; and

storing the heading difference as the orientation of the mobile device relative to the fixed display.

16 . The method of claim 1 , wherein the metadata comprises a media presentation description file.

17 . The method of claim 1 , wherein the metadata indicates a change in spatial location of the first viewport of the 360-degree video.

18 . The method of claim 1 , wherein receiving metadata indicating which portion of the 360-degree video corresponds to the first viewport of the 360-degree video displayed on the fixed display further comprises receiving metadata indicating the extent to which the portion of the 360-degree video corresponding to the first viewport of the 360-degree video is changing with time.

19 . An apparatus comprising:

a processor; and

a non-transitory computer-readable medium storing instructions that are operative, when executed by the processor, cause the apparatus to:

receive metadata indicating which portion of a 360-degree video corresponds to a first viewport of the 360-degree video displayed on a fixed display;

track an orientation of a mobile device relative to the fixed display;

determine a second viewport of the 360-degree video synchronized in time and orientation relative to the 360-degree video displayed on the fixed display based on the metadata and the orientation of the mobile device relative to the fixed display; and

display the second viewport on the mobile device.

20 . A method comprising:

receiving an immersive video displayed with a first viewport on a first display;

receiving metadata indicating the first viewport of the immersive video;

tracking a relative orientation between the first display and a second display;

synchronizing an orientation of a second viewport of the immersive video relative to the first viewport to generate a synchronized immersive video for the second viewport;

determining a modified viewport of the synchronized immersive video based on the first viewport and the relative orientation; and

displaying the modified viewport on the second display.

21 - 26 . (canceled)