AVS2 to H.265 ultrahigh-definition and H.264 high-definition double transcoder

The utility model relates to the technical field of broadcast digital televisions, in particular to an AVS2 to H.265 ultrahigh-definition and H.264 high-definition double transcoder which comprises amain board, a front panel and a power panel which are arranged in a machine shell, the front panel is arranged in front of the main board, the power panel is arranged on the left side of the main board, and the front panel and the power panel are connected with the main board through wires. The mainboard comprises a main control CPU unit, an AVS2 4K decoding unit, a coding unit, a code stream processing unit and an ASI/IP input and output unit. An AVS2 4K code stream signal is decoded into an ultrahigh-definition baseband video and audio signal through a built-in AVS2 4K decoding unit and a built-in coding unit, then the video signal is recoded into an H.265 ultrahigh-definition code stream and an H.264 high-definition code stream, the audio signal is recoded into an MPEG1 _ L2 code stream, the video and audio cod