Use VLC Media Player, which has built-in error resilience.
Note: Re-encoding takes time (10-30 minutes) and slightly reduces quality, but it guarantees perfect sync. heyzo1122 fix
Another common complaint under the keyword "heyzo1122 fix" is —the audio starts fine but is 2 seconds off by the end of the file. This happens when the video stream has variable frame rate (VFR) but the player assumes constant (CFR). Use VLC Media Player, which has built-in error resilience
If the file plays but you cannot seek (drag the progress bar), the MP4 header is corrupt. Use a tool called or MyMP4Box GUI . Use VLC Media Player