Effective error recovery method using packet loss rate of networks in realtime video transfer system

An error recovery method of a video transfer system comprising the steps of:

• setting an intra refresh rate on the basis of a packet loss rate of a video frame transmitted from a receiving party;
• counting macro-blocks in an inter mode without a coefficient when the packet loss rate is above a certain value, and encoding the block in an intra mode when the count value reaches a reference packet loss rate;
• and
• omitting the operation of counting the macro-blocks in the inter mode without a coefficient when the packet loss rate is below a certain value;
• wherein the refresh rate is set by using the following equation:
• 4 REFRESH_RATE = INT ⁡ [ - ( 132 100 ) × PLR ] + 132 ,
• wherein INT is an integer and PLR is a packet loss rate.

An error recovery method of a video transfer system in which when macro-blocks with a coefficient are transmitted, every 132th macro-block at minimum is forcefully encoded in an intra mode, comprising the steps of:

• linearly setting an intra refresh rate on the basis of a packet loss rate of a video frame transmitted form a receiving party;
• counting macro-blocks in an inter mode without a coefficient when the packet loss rate is above a certain value, and encoding the macro-blocks into an intro mode when the count value reaches a reference packet loss rate;
• and
• omitting the operation of counting the macro-blocks in the inter mode without a coefficient when the packet loss rate is above a certain value,
• wherein the refresh rate is set by using the following equation:
• 6 REFRESH_RATE = INT ⁡ [ - ( 132 100 ) × PLR ] + 132 ,
• wherein INT is an integer and PLR is a packet loss rate.