Bandwidth adjustment for real-time video transmission

A method of adjusting bandwidth for receiving a video bitstream from a sender, comprising:

• receiving, by a receiver, a series of data packets associated with a first portion of the video bitstream encoded using a current bitrate;
• determining, by the receiver using a processor, receiver-side bandwidth parameters based on the series of data packets, wherein the receiver-side bandwidth parameters comprise an accumulated time difference parameter determined based on a difference between a time stamp difference and a time period, wherein
• the time stamp difference is determined between the time stamp of the last data packet to arrive at the receiver within the time window and the time stamp of the first data packet of the series of data packets, and
• the time period is determined by the receiver as a difference between a current local time and a local time when the first data packet arrives at the receiver;
• decoding the encoded first portion of the video bitstream from the series of data packets;
• transmitting, to the sender, back channel messages, each comprising the receiver-side bandwidth parameters;
• and
• receiving, from the sender, a second portion of the video bitstream encoded using an adjusted current bitrate determined based on the receiver-side bandwidth parameters in response to receiving the back channel messages,
• wherein the current bitrate is adjusted based on the bandwidth indicator parameter and the accumulated time difference parameter of the receiver-side bandwidth parameters,
• wherein based on a determination that the absolute difference of the bandwidth indicator parameter and a preset threshold meets a first criteria and the accumulated time difference parameter meets a second criteria, the current bitrate is adjusted by multiplying the current bitrate with both the bandwidth indicator parameter and a first incremental value,
• wherein the bandwidth indicator parameter is determined, by the receiver, based on a ratio of a time window preset by the sender and a time stamp difference between the time stamp of a first data packet to arrive at the receiver within the time window and the time stamp of a last data packet to arrive at the receiver within the time window, the first and second data packets are associated with the series of data packets, and
• wherein the accumulated time difference parameter is determined based on a difference between a time stamp difference and a time period, wherein the time stamp difference is determined between the time stamp of the last a data packet to arrive at the receiver within the time window and the time stamp of the first data packet of the series of data packets, and the time period is determined by the receiver as a difference between a current local time and a local time when the first data packet arrives at the receiver.