Macroblock-level adaptive quantization in quality-aware video optimization

A method for video optimization of an encoded video stream comprising one or more video frames, each video frame comprising a plurality of macroblocks, the method being performed by at least one processor, the method comprising:

• receiving information for a macroblock of a video frame of the encoded video stream;
• extracting a first quantization parameter corresponding to quantization settings originally used for compressing the macroblock;
• determining, using the received information, motion vector information for at least one motion vector associated with the macroblock;
• computing a second quantization parameter for re-encoding the macroblock, the second quantization parameter based at least in part on the first quantization parameter and the motion vector information;
• and
• re-encoding the macroblock based on the second quantization parameter;
• and
• transmitting the re-encoded macroblock to a user device;
• wherein the macroblock was encoded using inter-prediction, and the motion vector information is indicative of relative positions of one or more prediction blocks.

A non-transitory computer readable medium that stores a set of instructions that is executable by a at least one processor of a video optimization system to cause the video optimization system to perform a method for video optimization of an encoded video stream comprising one or more video frames, each frame comprising a plurality of macroblocks, the method comprising:

• receiving information for a macroblock of a video frame of the encoded video stream;
• extracting a first quantization parameter corresponding to quantization settings originally used for compressing the macroblock;
• determining, using the received information, motion vector information for at least one motion vector associated with the macroblock that indicates a location of at least one prediction block within the video frame or another video frame which was subtracted from the macroblock prior to encoding;
• computing a second quantization parameter for re-encoding the macroblock, the second quantization parameter based at least in part on the first quantization parameter and the motion vector information;
• re-encoding the macroblock based on the second quantization parameter;
• and
• transmitting the re-encoded macroblock to a user device.

A non-transitory computer readable medium that stores a set of instructions that is executable by a at least one processor of a video optimization system to cause the video optimization system to perform a method for video optimization of an encoded video stream comprising one or more video frames, each frame comprising a plurality of macroblocks, the method comprising:

• receiving information for a macroblock of a video frame of the encoded video stream;
• extracting a first quantization parameter corresponding to quantization settings originally used for compressing the macroblock;
• determining, using the received information, motion vector information for at least one motion vector associated with the macroblock;
• computing a second quantization parameter for re-encoding the macroblock, the second quantization parameter based at least in part on the first quantization parameter and the motion vector information;
• re-encoding the macroblock based on the second quantization parameter;
• and
• transmitting the re-encoded macroblock to a user device;
• wherein the macroblock was encoded using inter-prediction, and the motion vector information is indicative of relative positions of one or more prediction blocks.

A video optimizer for video optimization of an encoded video stream comprising one or more video frames, each frame comprising a plurality of macroblocks, the video optimizer comprising:

• a decoder configured to:
• receive information for a macroblock of a video frame of the encoded video stream and
• extract a first quantization parameter corresponding to quantization settings originally used for compressing the macroblock;
• a quantization parameter adjustment module configured to:
• determine, using the received information, motion vector information for at least one motion vector associated with the macroblock that indicates a location of at least one prediction block within the video frame or another video frame which was subtracted from the macroblock prior to encoding;
• compute a second quantization parameter for re-encoding the macroblock, the second quantization parameter based at least in part on the first quantization parameter and the motion vector information;
• and
• an encoder configured to:
• re-encode the macroblock based on the second quantization parameter;
• and
• provide the re-encoded macroblock for transmission to a user device.

A video optimizer for video optimization of an encoded video stream comprising one or more video frames, each frame comprising a plurality of macroblocks, the video optimizer comprising:

• a decoder configured to receive information for a macroblock of a video frame of the encoded video stream, and to extract a first quantization parameter corresponding to quantization settings originally used for compressing the macroblock;
• a quantization parameter adjustment module configured to:
• determine, using the received information, motion vector information for at least one motion vector associated with the macroblock;
• compute a second quantization parameter for re-encoding the macroblock, the second quantization parameter based at least in part on the first quantization parameter and the motion vector information;
• and
• an encoder configured to re-encode the macroblock based on the second quantization parameter and to provide the re-encoded macroblock for transmission to a user device;
• wherein the macroblock was encoded using inter-prediction, and the motion vector information is indicative of relative positions of one or more prediction blocks.