For a physical high-quality copy, the film was released on and DVD by Yash Raj Films , which offers the most reliable "verified" audio and video quality.
If you already have an MKV, run MediaInfo. If it matches the specs above, you’re good. If not – re-download from a source that lists release group and source (e.g., “Chak.De.India.2007.1080p.BluRay.x264-DDR”). mkv of chak de india verified