MP3 Has No Sound or Cuts Off?

Two different problems: truncation (incomplete file) vs silence (source or player issue).

If it cuts off early

Likely an incomplete download. Re-download the file completely.

If there is no sound at all

• Test the original YouTube video: does it have audio?
• Try a different player
• Re-convert the link

Prevention

• Wait for the download to complete fully
• Check file size: suspiciously small means incomplete

See no sound guide and file won't play.