Video reception method, video transmission method, video reception apparatus, and video transmission apparatus
Provided is a video reception method performed by a video reception apparatus including a display. The video reception method includes: receiving a reception signal multiplexed from video data and audio data; outputting, as first transfer characteristics information, transfer characteristics obtained by demultiplexing the reception signal; outputting, as second transfer characteristics information, transfer characteristics obtained by decoding the video data, the second transfer characteristics information being information for specifying, at frame accuracy, a transfer function corresponding to a luminance dynamic range of the video data; and displaying the video data while controlling a luminance dynamic range of the display at frame accuracy according to the second transfer characteristics information.
1. A decoding method comprising:
receiving a system stream transmitted from a transmission apparatus, the system stream including a video data, an audio data, and a descriptor, the descriptor including first information indicating a transfer function specifying a luminance dynamic range of the video data;
decoding the video data to generate frames and second information, the frames including a first frame and a second frame following the first frame in a time axis; and
converting the frames into input signals input into a display while controlling a converting scheme applied to each frame based on at least one of the first information or the second information, a first converting scheme being applied to convert the first frame, a second converting scheme different from the first converting scheme being applied to convert the second frame.
2. The decoding method according to claim 1 , wherein the second information is used to control the converting scheme applied to each frame.
3. The decoding method according to claim 1 , wherein the first information is provided in the multiplexing layer in unsynchronized with the frames.
4. The decoding method according to claim 1 , wherein the second information is provided in the video coding.
5. The decoding method according to claim 1 , further comprising:
determining whether the video signal is correctly obtained; and
controlling the maximum luminance displayed at the display to be lower than the maximum luminance of a Standard Dynamic Range (SDR) when the video signal is obtained incorrectly.
6. A decoding apparatus comprising:
a receiver; and
a processor that, in operation, performs:
receiving, through the receiver, a system stream transmitted from a transmission apparatus, the system stream including a video data, an audio data, and a descriptor, the descriptor including first information indicating a transfer function specifying a luminance dynamic range of the video data;
decoding the video data to generate frames and second information, the frames including a first frame and a second frame following the first frame in a time axis; and
converting the frames into input signals input into a display while controlling a converting scheme applied to each frame based on at least one of the first information or the second information, a first converting scheme being applied to convert the first frame, a second converting scheme different from the first converting scheme being applied to convert the second frame.
7. The decoding apparatus according to claim 6 , wherein the second information is used to control the converting scheme applied to each frame.
8. The decoding apparatus according to claim 6 , wherein the first information is provided in the multiplexing layer in unsynchronized with the frames.
9. The decoding apparatus according to claim 6 , wherein the second information is provided in the video coding.
10. The decoding apparatus according to claim 6 , further comprising:
determining whether the video signal is correctly obtained; and
controlling the maximum luminance displayed at the display to be lower than the maximum luminance of a Standard Dynamic Range (SDR) when the video signal is obtained incorrectly.