Efficient approach to dynamic frame size and frame rate adaptation

A system for dynamically adapting video encoding parameters of a video data sender to an available bandwidth of a video data receiver, comprising:

• at least one processor operative to execute at least one program out of at least one memory:
• to obtain a target bitrate of encoded video for the video data receiver;
• to obtain a set of scaled frame size/frame rate pairs, each scaled frame size/frame rate pair including a frame size scaled by a predetermined spatial scaling factor, and a frame rate scaled by a predetermined temporal scaling factor;
• for each scaled frame size/frame rate pair:
• to obtain a fair quality bitrate of the encoded video as a function of at least the scaled frame size, the scaled frame rate, and a content complexity of the encoded video;
• to obtain a scaling penalty as a function of at least a frame size of a previous encoded frame of the encoded video, a frame rate of the previous encoded frame of the encoded video, and the content complexity of the encoded video;
• and
• to obtain a score value as a function of at least the scaling penalty and an absolute difference between the fair quality bitrate and the target bitrate of the encoded video;
• and
• to configure a video encoder of the video data sender with the scaled frame size and the scaled frame rate included in the respective scaled frame size/frame rate pair having a score value satisfying a predetermined condition.

In a multimedia communications system, a method of dynamically adapting video encoding parameters of a video data sender to an available bandwidth of a video data receiver, comprising:

• obtaining a set of scaled frame size/frame rate pairs, each scaled frame size/frame rate pair including a frame size scaled by a predetermined spatial scaling factor, and a frame rate scaled by a predetermined temporal scaling factor;
• for each scaled frame size/frame rate pair:
• obtaining a fair quality bitrate of encoded video as a function of at least the scaled frame size, the scaled frame rate, and a content complexity of the encoded video;
• obtaining a scaling penalty as a function of at least a frame size of a previous encoded frame of the encoded video, a frame rate of the previous encoded frame of the encoded video, and the content complexity of the encoded video;
• and
• obtaining a score value as a function of at least the scaling penalty, the fair quality bitrate, and a target bitrate of the encoded video for the video data receiver;
• and
• configuring a video encoder of the video data sender with the scaled frame size and the scaled frame rate included in the respective scaled frame size/frame rate pair having a score value satisfying a predetermined condition.