Method of transmitting 360-degree video, method of receiving 360-degree video, device for transmitting 360-degree video, and device for receiving 360-degree video

A digital receiver for providing at least one subtitle for a VR (virtual reality) service, the digital receiver comprising:

• a controller configured to:
• extract bitstreams for audio data and video data;
• parse metadata related to the VR service;
• decode the audio data and the video data based on the metadata related to the VR service;
• render the audio data and the video data based on a user's viewport detected by a head or eye tracking component;
• a display configured to:
• display the video data in a display module and outputting the audio data in a speaker or a headphone;
• display a first subtitle for a first object and a second subtitle for a second object when the displayed video data includes the first and second objects depending on the user's viewport;
• and
• continue to display the first subtitle and the second subtitle by rendering the first and the second subtitles even when the displayed video data includes either the first object or the second object depending on the user's viewport.

A method of providing at least one subtitle for a VR (virtual reality) service in a receiver, the method comprising:

• extracting bitstreams for audio data and video data;
• parsing metadata related to the VR service;
• decoding the audio data and the video data based on the metadata related to the VR service;
• rendering the audio data and the video data based on a user's viewport detected by a head or eye tracking component;
• displaying the video data in a display module and outputting the audio data in a speaker or a headphone;
• displaying a first subtitle for a first object and a second subtitle for a second object when the displayed video data includes the first and second objects depending on the user's viewport;
• displaying the first subtitle without rendering the second subtitle when the displayed video data includes the first object and does not include the second object depending on the user's viewport;
• and
• displaying the second subtitle without rendering the first subtitle when the displayed video data includes the second object and does not include the first object depending on the user's viewport.

A method of providing at least one subtitle for a VR (virtual reality) service in a receiver, the method comprising:

• extracting bitstreams for audio data and video data;
• parsing metadata related to the VR service;
• decoding the audio data and the video data based on the metadata related to the VR service;
• rendering the audio data and the video data based on a user's viewport detected by a head or eye tracking component;
• displaying the video data in a display module and outputting the audio data in a speaker or a headphone;
• displaying a first subtitle for a first object and a second subtitle for a second object when the displayed video data includes the first and second objects depending on the user's viewport;
• continuing to display the first subtitle and the second subtitle by rendering the first and the second subtitles even when the displayed video data includes either the first object or the second object depending on the user's viewport.