Moving image reencoding device and moving image reencoding method

A moving image reencoding method, comprising:

• decoding encoded moving image data, by a computer processor, that is encoded by a first encoding method that enables switching for a frame encoding mode in which encoding is performed on the basis of a frame or a field encoding mode in which encoding is performed on the basis of a field, in a unit of each of a plurality of blocks into which each of frames of the encoded moving image data is divided, and acquiring importance degree information of an encoding mode that is switched in the unit of each of the plurality of blocks when decoding the encoded moving image data, the importance degree information relating to at least one of a ratio of the plurality of blocks that are encoded in the frame encoding mode and in the field encoding mode, and a degree of movement in each of the frames of the encoded moving image data;
• determining an encoding parameter that is set to a second encoding method, the second encoding method enabling switching for the frame encoding mode or the field encoding mode in a unit of each of the frames, the encoding parameter relating to a bit rate of the second encoding method for the decoded moving image data;
• determining an encoding mode of the second encoding method on the basis of the importance degree information that is acquired, and the encoding parameter that is determined, so that the field encoding mode has higher priority than the frame encoding mode as the bit rate to which the encoding parameter is related is lower and so that the frame encoding mode has higher priority than the field encoding mode as the bit rate to which the encoding parameter is related is higher;
• and
• performing the second encoding with respect to the moving image data that is decoded, in accordance with the encoding mode that is determined.

non-transitory computer-readable medium storing a moving image reencoding program that causes a computer to execute a process, comprising:

• decoding encoded moving mage data that is encoded by a first encoding method that enables switching for a frame encoding mode in which encoding is performed on the basis of a frame or a field encoding mode in which encoding is performed on the basis of a field, in a unit of each of a plurality of blocks into which each of frames of the encoded moving image data is divided, and acquiring importance degree information of an encoding mode that is switched in the unit of each of the plurality of blocks when decoding the encoded moving image data, the importance degree information relating to at least one of a ratio of the plurality of blocks that are encoded in the frame encoding mode and in the field encoding mode, and a degree of movement in each of the frames of the encoded moving image data;
• determining an encoding parameter that is set to a second encoding method, the second encoding method enabling switching for the frame encoding mode or the field encoding mode in a unit of each of the frames, the encoding parameter relating to a bit rate of the second encoding method for the decoded moving image data;
• determining an encoding mode of the second encoding method or the basis of the importance degree information that is acquired, and the encoding parameter that is determined, so that the field encoding mode has higher priority than the frame encoding mode as the bit rate to which the encoding parameter is related is lower and so that the frame encoding mode has higher priority than the field encoding mode as the bit rate to which the encoding parameter is related is higher;
• and
• performing the second encoding with respect to the moving image data that is decoded, in accordance with the encoding mode that is determined.