Stella

Fix it with Stella · Video files

“This file can't be played”? It will be.

Sound but no picture, picture but no sound, or a flat “format not supported.” Stella looks at what's actually inside the file, converts exactly the codec your TV or phone rejects — HEVC to H.264, EAC3 audio to AAC — and hands back an MP4 that just plays. One file or the whole folder.

See pricing

Free. No credit card, no trial. Go is $5/mo, Pro is $15/mo.

Sound familiar?

You've probably already searched this.

  • mkv won't play on my tv fix
  • convert mkv to mp4 for samsung tv
  • video plays but no sound on tv convert
  • this file cannot be played format not supported
  • unsupported audio codec convert video
  • convert wmv to mp4 windows

How it works

Tell Stella. It works your computer. Done.

  1. 1You describe the problem in your own words.
  2. 2Stella uses your apps, browser, and files.
  3. 3You watch every step. Destructive work waits.

Try this prompt

“My TV won't play these MKVs — I get sound but no picture. Convert the folder to something it accepts.”

You: My TV won't play these MKVs — I get sound but no picture. Convert the folder to something it accepts. Stella: Video is HEVC; the TV wants H.264. I'll transcode just that stream and leave the rest. You: Whole folder. Stella: Batch is done. Outputs play — no upload, no DRM files in the set.

On this problem

What Stella actually does.

  • Inspects the file to see exactly which video or audio stream the device rejects
  • Remuxes when only the container is wrong — fast and lossless
  • Transcodes only the offending codec when it has to, keeping quality
  • Handles the whole folder in a batch and verifies the output plays

Ready when you are

Files that just play.

Download Stella for Mac or Windows and tell it what's broken.

More things Stella fixes

Free. No credit card, no trial.