Electronic device and video processing method using same

An electronic device comprising:

• a display;
• memory storing instructions;
• and
• at least one processor,
• wherein the instructions, when executed by the at least one processor, cause the electronic device to:
• detect an input to request playback of a first time point of a video while playing the video;
• identify a number of frames from the first time point to a second time point indicating a previous sync frame based on a table related to frames of the video;
• calculate time for decoding based on maximum performance of a codec according to resolution of the video and the identified number of frames;
• and
• decode the video, based on the maximum performance of the codec according to the resolution of the video and the frames from the first time point to the second time point in case that the calculated time for decoding is within a reference time.