What is a y4m file and how do I open a y4m file?
The Y4M file extension is a video file created in the YUV4Mpeg format. It stores a sequence of uncompressed YCbCr images that make up the video frame by frame, used as a raw, colour sensitive video format before compressing into a more popular video format such as MPEG-2 or MKV.
Relevant y4m file links:How to open y4m file on Youtube
How to open y4m file on Wikipedia
How to open y4m file on Microsoft.com