The phrase is a combination of technical specifications used to market a specific type of file:
While a 2-hour HD movie can typically consume 6GB, "fixed" 300MB versions utilize advanced encoding to maintain visual fidelity at a fraction of the size. quality and all size free dual audio 300mb movies fixed
"REPACK: Previous audio drifted after 01:23:45. Re-synced and re-encoded." The phrase is a combination of technical specifications