MP4 Corrupted?

[Microsoft Windows]

Hello!I recorded an almost 4 hour livestream awhile ago and decided to rewatch and edit it. It saved as an mp4 file on my computer.When I went to rewatch it with Windows Media Player, there was perfect sound, but no video whatsoever. Then when I opened the file into Microsoft Clipchamp, there was perfect video, but then the audio is only there for the first few minutes before it completely cuts out.Is there a way to fix it so the audio and video plays together?I've tried converting it through VLC to see if it would help, but no dice.TIA for any help!

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