Here’s a review of that specific release:

This is sourced from a legitimate BluRay, so the underlying master is likely good for a late-50s film. Encoded in x265/HEVC at 1080p, which means efficient compression—smaller file size than x264 while retaining good detail. However, playback compatibility is lower on older devices. SARTRE’s encodes are generally competent but not high-end (not as famous as SWTYBLZ or Tigole). Expect decent grain retention, but check for potential banding in darker scenes.

AAC audio. This is a lossy codec—acceptable for casual viewing, but purists would prefer AC3 or DTS from the original BluRay. Since the original mono track doesn’t need high bitrate, AAC is fine for dialogue clarity. No mention of multiple tracks; likely just the original English mono.