Adjusting encoding frame size based on available network bandwidth

• US 10,349,059 B1
• Filed: 07/17/2018
• Issued: 07/09/2019
• Est. Priority Date: 07/17/2018
• Status: Active Grant

• Current Assignee: Wowza Media Systems LLC
• Original Assignee: Wowza Media Systems LLC
• Inventors: Good, Charles F.
• Primary Examiner(s): Le, Peter D
• Application Number:
  US16/037,786
• Time in Patent Office: 357 Days
• CPC Class Codes: H04N 19/115 Selection of the code volume for a coding unit prior to coding
• CPC Class Codes: H04N 19/132 Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
• CPC Class Codes: H04N 19/152 by measuring the fullness of the transmission buffer
• CPC Class Codes: H04N 19/164 Feedback from the receiver or from the transmission channel
• CPC Class Codes: H04N 19/184 the unit being bits, e.g. of the compressed video stream
• CPC Class Codes: H04N 19/196 being specially adapted for the computation of encoding parameters, e.g. by averaging previously computed encoding parameters processing of motion vectors H04N19/513

Abstract

A method includes reducing, at an encoder, an encoding bit rate of video data in response to a first indication of available bandwidth for transmission of the encoded video data. The method includes reducing an encoding frame size of the video data in response to the encoding bit rate falling below a first threshold. The method also includes increasing the encoding bit rate in response to a second indication of the available bandwidth. The method further includes increasing the encoding frame size in response to the encoding bit rate rising above a second threshold. The second threshold is greater than the first threshold.

Claims

1. A method of encoding video data, the method comprising:

reducing, at an encoder, an encoding bit rate of video data in response to a first indication of available bandwidth for transmission of the encoded video data;

reducing an encoding frame size of the video data in response to the encoding bit rate falling below a first threshold;

increasing the encoding bit rate in response to a second indication of the available bandwidth;

increasing the encoding frame size in response to the encoding bit rate rising above a second threshold, the second threshold greater than the first threshold, wherein the first threshold and the second threshold are based on a first bit rate threshold and a window size;

increasing the encoding bit rate in response to a third indication of the available bandwidth; and

increasing the encoding frame size in response to the encoding bit rate rising above a third threshold, the third threshold greater than the second threshold.

2. The method of claim 1, wherein the encoding frame size is reduced from a first frame size to a second frame size in response to the encoding bit rate falling below the first threshold, and wherein the encoding frame size is increased from the second frame size to the first frame size in response to the encoding bit rate rising above the second threshold.

3. The method of claim 1, wherein the first bit rate threshold corresponds to a midpoint between the first threshold and the second threshold.

4. The method of claim 3, wherein the window size corresponds to a difference between the second threshold and the first threshold.

5. The method of claim 1, wherein the third threshold is based on a second bit rate threshold and the window size.

6. The method of claim 1, further comprising transmitting a stream of encoded data to a remote device over a network connection.

7. The method of claim 1, wherein the first indication of the available bandwidth corresponds to an amount of encoded data in a write buffer exceeding a first backlog threshold.

8. The method of claim 7, wherein the second indication of the available bandwidth corresponds to the amount of encoded data in the write buffer falling below a second backlog threshold.

9. A device comprising:

an encoder configured to;

reduce an encoding bit rate of video data in response to a first indication of available bandwidth for transmission of the encoded video data;

reduce an encoding frame size of the video data in response to the encoding bit rate falling below a first threshold;

increase the encoding bit rate in response to a second indication of the available bandwidth;

increase the encoding frame size in response to the encoding bit rate rising above a second threshold, the second threshold greater than the first threshold, wherein the first threshold and the second threshold are based on a first bit rate threshold and a window size;

increase the encoding bit rate in response to a third indication of the available bandwidth; and

increase the encoding frame size in response to the encoding bit rate rising above a third threshold, the third threshold greater than the second threshold.

10. The device of claim 9, further comprising a write buffer coupled to the encoder, wherein the first indication of the available bandwidth corresponds to an amount of encoded data in the write buffer.

11. The device of claim 10, further comprising a network interface configured to transmit a stream of the encoded data from the write buffer to a remote device.

12. The device of claim 9, wherein the encoder includes a frame size selector configured to select the encoding frame size.

13. A computer-readable storage device storing instructions that, when executed by a processor, cause the processor to perform operations comprising:

reducing, at an encoder, an encoding bit rate of video data in response to a first indication of available bandwidth for transmission of the encoded video data;

reducing an encoding frame size of the video data in response to the encoding bit rate falling below a first threshold;

increasing the encoding bit rate in response to a second indication of the available bandwidth;

increasing the encoding frame size in response to the encoding bit rate rising above a second threshold, the second threshold greater than the first threshold, wherein the first threshold and the second threshold are based on a first bit rate threshold and a window size;

increasing the encoding bit rate in response to a third indication of the available bandwidth; and

increasing the encoding frame size in response to the encoding bit rate rising above a third threshold, the third threshold greater than the second threshold.

14. The computer-readable storage device of claim 13, wherein the instructions when executed further cause the processor to:

reduce the encoding frame size from a first frame size to a second frame size in response to the encoding bit rate falling below the first threshold; and

increase the encoding frame size from the second frame size to the first frame size in response to the encoding bit rate rising above the second threshold.

15. The computer-readable storage device of claim 13, wherein the operations further include transmitting a stream of encoded data to a remote device over a network connection.

16. The computer-readable storage device of claim 13, wherein the first indication of the available bandwidth corresponds to an amount of encoded data in a write buffer exceeding a first backlog threshold.