A video player for Linux that tells you exactly why a file will or will not play. A lightweight Linux alternative to codec-aware players such as GOM Player.

What it really does:

• Plays video through a bundled FFmpeg build (H.264, HEVC, VP8/VP9, AV1, MPEG-2/4, ProRes and many more). Video only: this release has no audio output.
• Codec Doctor reads every stream of the open file and checks each codec against the real decoder list of the bundled FFmpeg: PLAYABLE or MISSING DECODER. It does not download codecs.
• Test-decode runs a real 10 second decode pass and reports errors.
• One click converts a problem file to MP4 (H.264+AAC), MKV (H.265+Opus) or WebM (VP9+Opus) with a progress bar.
• Library Check scans your Videos, Downloads and removable media and flags files that need conversion.
• Codec Inventory lists every decoder and encoder available in this build, with a filter.

Disclaimer: This project is an independent open-source tool and is not affiliated with, sponsored by, or endorsed by the authors or owners of GOM Player.