US 11,445,243 B2 · Adaptive rate control adjustment for hardware encoder

Abstract

Correcting encode bit rate errors developed by a hardware encoder with an outer software rate adjustment loop. The rate adjustment loop maintains a VBV (video buffering verifier) buffer model. When VBV buffer fullness is over a threshold, the rate adjustment loop drops frames. If below the threshold, periodically a rate adjustment analysis performed. If a number of frames above a threshold have been dropped, the hardware encoder bit rate is decreased. A leaky bucket is checked to determine in bits and out bits. If the number of in bits exceeds the number of out bits times a multiplier, the hardware encoder bit rate is decreased. If the number of in bits times a multiplier is less than the number of out bits, the hardware encoder bit rate is increased. Dropping frames on buffer condition provides shorter term correction and adjustment of the hardware encoder bit rate provides longer term correction.

Claims20

Dependent claims

An encoded video transmitter comprising:

a video input;
an encoded video output;
a hardware video encoder coupled to the video input and to the encoded video output;
an outgoing video buffer coupled to the hardware video encoder and to the encoded video output and receiving frames from the hardware video encoder and providing frames to the encoded video output;
a processor coupled to the hardware video encoder, the video input and the outgoing video buffer;
and
a non-transitory memory coupled to the processor and storing instructions to cause the processor to perform a method comprising the steps of:
receiving a video frame to be encoded;
determining a fullness level value of the outgoing video buffer;
causing encoding of the received video frame to be skipped when the buffer fullness level value is above a threshold;
and
periodically performing video encoding rate operations and adjusting of an encoding bit rate of the hardware video encoder if appropriate.

9 more elements

A method of transmitting encoded video from an encoded video transmitter using a hardware video encoder, the method comprising:

receiving a video frame to be encoded;
determining a fullness level value of an outgoing video buffer;
causing encoding of the received video frame to be skipped when the buffer fullness level value is above a threshold;
and
periodically performing video encoding rate operations and adjusting of an encoding bit rate of the hardware video encoder if appropriate.

2 more elements

A non-transitory memory coupled to a processor and storing instructions to cause the processor to perform a method comprising the steps of:

receiving a video frame to be encoded;
determining a fullness level value of an outgoing video buffer;
causing encoding of the received video frame to be skipped when the buffer fullness level value is above a threshold;
and
periodically performing video encoding rate operations and adjusting of an encoding bit rate of a hardware video encoder if appropriate.

2 more elements

Dependencies are inferred from the claim text.

Adaptive rate control adjustment for hardware encoder

Life of this patent

Adaptive rate control adjustment for hardware encoder

Life of this patent

Abstract

Claims20