Techniques for synchronization of audio and video

An apparatus comprising:

• at least one hardware logic comprising:
• a video renderer;
• a video renderer buffer;
• an audio renderer;
• an audio renderer buffer;
• and
• a presentation timing module to receive presentation time stamps and video renderer buffer level and audio renderer buffer level of the video renderer and audio renderer, wherein the presentation timing module is to determine whether modification of a presentation time stamp is permitted, wherein modification of the presentation time stamp is permitted in response to a change in a difference between the presentation time stamp and a theoretical presentation time stamp not exceeding a threshold for a period of time, and
• wherein the presentation timing module is to permit modification of the presentation time stamp by an amount in response to a determination that modification of the presentation time stamp is permitted, the amount is based in part on a difference between a presentation time stamp value and a theoretical presentation time stamp value, the presentation timing module is to reduce the amount in response to a decreasing or steady difference between a current buffer level and a stable buffer level, and the presentation timing module is to increase the amount in response to an increasing difference between the current buffer level and the stable buffer level.

A system comprising:

• a wireless network interface;
• a display;
• and
• a processor configured to:
• determine whether to permit audio-video synchronization using both a system time clock and presentation time stamps based in part on whether differences between the presentation time stamps and theoretical presentation time stamps of at least one of a video or audio stream do not change by more than a threshold value over a period of time and
• in response to permission for audio-video synchronization using both the system time clock and the presentation time stamps, the processor is to determine an amount to adjust a presentation time stamp of at least one of the video or the audio stream, wherein the amount is based in part on a difference between a presentation time stamp value and a theoretical presentation time stamp value, the processor is to reduce the amount in response to a steady or reduced buffer overflow or underflow condition, the processor is to increase the amount in response to increased buffer overflow or underflow condition, and the processor is to reduce the presentation timestamp value by the amount in response to a current buffer level exceeding a stable buffer level or increase the presentation timestamp value by the amount in response to the current buffer level not exceeding the stable buffer level.