Patent ID: 8483551

Claim:
A trick play system, comprising: a transmission condition determining unit configured to determine instantaneous decoding refresh (IDR) transmission conditions based on a received speed value; and a double-speed IDR-unit generating unit configured to generate a double-speed IDR-unit by adjusting the number and data size of video frames to be transmitted in accordance with the transmission conditions determined by the transmission condition determining unit; wherein the double-speed IDR-unit generating unit receives total frames including an IDR frame and a plurality of prediction frames between the IDR frame and an immediately next IDR frame, removes a latter half of prediction frames from the total frames, and generates the double-speed IDR-unit with the remaining frames when a data size of the remaining frames is less than half of the data size of the total frames; and wherein the double-speed IDR-unit generating unit removes frames referring to the removed prediction frames from the remaining frames.