guineapignoises

I'm struggling to work out what all their different noises mean Could anyone help me? Not sure how to show the videos on here though

I’ve had my guinea pig, Martin, for about 2 years now and he just started making these weird chirping noises almost like a bird. I took a video and it will be below. Please help. He’s never made these noises before. He’s just chilling in the corner of his cage and I’m worried. I googled it and...