Method and device for processing video signal by using inter prediction

A method of encoding a video signal by a device, comprising:

• constructing a reference picture list of a current picture;
• and
• generating code information for constructing the reference picture list,
• wherein the code information includes a number of entries in the reference picture list, a first flag indicating whether an entry of the reference picture list is a short-term reference picture (STRP) entry or a long-term reference picture (LTRP) entry, a picture order count (POC) difference between a reference picture related to the STRP entry and another picture, and a POC modulo value of a reference picture related to the LTRP entry,
• wherein the another picture is the current picture based on that the entry marked as the STRP is a first STRP entry in the marking of each of entries of the reference picture, or the another picture is a previous STRP in the reference picture list based on that the entry marked as the STRP is not the first STRP in the marking of each of entries of the reference picture;
• wherein the number of entries has a maximum value as a maximum required size of a decoded picture buffer plus 13.

A transmission method for a bitstream related to a video signal, the method comprising:

• generating the bitstream related to the video signal;
• and
• transmitting the bitstream,
• wherein the bitstream is generated by performing the steps of:
• constructing a reference picture list of a current picture;
• and
• generating code information for constructing the reference picture list,
• wherein the code information includes a number of entries in the reference picture list, a first flag indicating whether an entry of the reference picture list is a short-term reference picture (STRP) entry or a long-term reference picture (LTRP) entry, a picture order count (POC) difference between a reference picture related to the STRP entry and another picture, and a POC modulo value of a reference picture related to the LTRP entry,
• wherein the another picture is the current picture based on that the entry marked as the STRP is a first STRP entry in the marking of each of entries of the reference picture, or the another picture is a previous STRP in the reference picture list based on that the entry marked as the STRP is not the first STRP in the marking of each of entries of the reference picture;
• wherein the number of entries has a maximum value as a maximum required size of a decoded picture buffer plus 13.