Mood: The mood of the video appears to be romantic and celebratory, with a focus on love and relationships. The theme seems to be centered around Valentine's Day, with the title 'Valentine Mashup 2019' and the use of red hearts. The overall emotion conveyed is one of joy, love, and togetherness.

Environment: The environment and setting of the video seem to be varied, with images of couples in different locations, including outdoor settings, parties, and intimate moments. The settings appear to be vibrant and lively, with a mix of traditional and modern elements.