Video Plays But Has No Sound
Your video file plays back visually but there is no audio — either the audio track is missing, the codec is unsupported, or the volume is muted.
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Video Has No Sound — Causes and Fixes
If your video plays but has no audio, work through these possibilities in order:
1. Check the Obvious First
- System volume — Is your device volume turned up? Is the video player muted?
- Headphones — Try unplugging and replugging. Try another audio output.
- Player mute button — Some players (VLC, QuickTime) have their own mute button separate from system volume.
2. The Video Has No Audio Track
Some videos are legitimately silent (screen recordings, animations, security camera footage). Verify in VLC: Tools → Media Information → Codec → Stream — look for "Audio: " in the codec details. If only "Video:" is listed, there's no audio track.
3. Unsupported Audio Codec
Windows Media Player and QuickTime don't support all audio codecs. If the audio is encoded in AAC (QuickTime on Windows), DTS, AC3 (Dolby), or FLAC, standard players may not decode it.
Fix: Install VLC Media Player — it supports virtually every audio codec and plays them without additional downloads.
4. The Audio Track Is Present but Silent
Some recordings (especially screen captures or webcam clips) record audio from the wrong source (no microphone, muted input).
Fix: You cannot add audio that was never recorded. You can add a new audio track using video editing software.
5. Corrupt Audio Track
If the video previously had sound and now doesn't after transferring or editing, the audio track may be corrupt.
Fix: Try opening the file in VLC → Tools → Media Information. If audio is listed but silent, try re-encoding with HandBrake (select the same video codec + AAC audio). HandBrake sometimes fixes broken audio tracks during re-encode.
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Frequently asked questions
Why does my video play but have no sound?
Common causes: (1) The audio uses a codec the player doesn't support (AC-3, DTS, or MP3 in an MP4 container expecting AAC). (2) The video was recorded without audio. (3) The audio stream is present but muted at the track level. Open the file in VLC → Tools → Codec Information → Streams tab to see if an audio stream exists.
How do I fix no audio in a video on Windows?
First try VLC: if VLC produces sound but Windows Media Player does not, install the K-Lite Codec Pack to extend WMP's codec support. If VLC also has no audio, the video either has no audio track or the track is corrupt. Use HandBrake to re-encode the video: if it detects an audio track, you can include it in the output; if it finds none, the original recording had no audio.
How do I add audio to a video that has no sound?
Use DaVinci Resolve (free professional editor): import the video, add a new audio track, import your audio file, align it, and export. Or use FFmpeg in a terminal: ffmpeg -i video.mp4 -i audio.mp3 -c:v copy -map 0:v:0 -map 1:a:0 output.mp4. Online alternatives: Kapwing and Clideo offer browser-based audio-addition tools.