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Why don’t I hear sound after converting into MP4?

In all likelihood, it has to do with an audio codec issue.
1) Download and install codec packs:
For Windows – https://codecguide.com/download_k-lite_codec_pack_mega.htm

In all likelihood, it has to do with an audio codec issue.  Download and install codec packs

For MAC – https://perian.org

 Download and install codec packs

2) After installation, reboot the system.
3) Try playing the video again.