To achieve the best results, follow these guidelines:
Better than a standard "fast" or "low-quality" encode. Subtitled: Pre-baked with English text (engsub).
In 2014, the digital landscape was in flux. Physical media (DVDs) were dying, but the standard definition rips (AVI, often 700MB to 1.4GB in size) were being replaced by High Definition (HD) MP4 and MKV containers. The term "convert" suggests a transgression of format. The original uploader likely possessed a DVD image (ISO) or a raw MPEG-2 file, which was too large for easy sharing on the bandwidth-constrained forums or torrent sites of the time.