The phrase "Avengers Infinity War Hindi audio track download MP3 work" implies you want a functional, non-corrupted file. The only way to guarantee it "works" is to extract it yourself from a verified source (your own DVD/Blu-ray or Hotstar download).

The most reliable way to experience the film in Hindi is through licensed platforms. These services allow you to switch audio tracks seamlessly and download the content for offline use within their respective apps. Disney+ Hotstar (India)

Disney released Avengers: Infinity War in Hindi with two variants:

Open your Avengers.Infinity.War.2018.1080p.Hindi.mkv file in MKVToolNix. Look for the "Tracks" section. You will see:

Avoid random websites promising "Infinity War Hindi MP3 320kbps Direct Link." They will give you malware or a recording of a guy coughing in a cinema. Do it the open-source way with FFmpeg, and you will have a clean, working Hindi audio track that makes Thanos’ snap sound terrifying—in perfect Desi Dolby Digital.