Open the file in MediaInfo. Look for:
A bad “fix” might just be the same broken file with a renamed extension. goodfellas1990720pblurayx264englishwith fix
If you have a bad 720p rip and want to fix it yourself: Open the file in MediaInfo
That’s a real “fix” – not just renaming. A bad “fix” might just be the same
The most frequent problem. The x264 encode might have a constant or gradually worsening audio delay (e.g., 250ms off by the second hour). A “fix” re-muxes the audio with corrected timestamps.