Why does my video have no sound after converting it? Causes & fixes
Two likely causes: the conversion tool copied only the video stream and dropped audio, or the target container needs a specific audio codec (WebM needs Opus or Vorbis, not AAC/MP3) that wasn't used.
Check these first
- Whether the source file has audio in the first place
- Which audio codec the conversion actually produced, if you can check it
Likely causes
- The conversion step dropped the audio stream
A command or tool that copies only the video stream (common in quick trims or format-only conversions) produces a file that is silent by construction, not by platform behavior.
- WebM needs Opus (or Vorbis) audio, not AAC or MP3
A WebM container built with an AAC or MP3 audio stream is invalid - check the actual encoded audio with a media inspector; browser metadata here cannot identify that codec.
Fix it
- Re-run the conversion with an explicit audio codec
For inputs up to 100 MB, this converter selects output codecs automatically; it does not expose audio-codec controls. Preview the generated audio, and use an editor with explicit track selection if a particular track is required.
Convert with audio
Prepare a copy in Koldflux, review its output and check the current destination requirements before publishing.
Automate this in Koldflux