How to Find What Codec a Video Uses

Q: How can I check a video codec without uploading the file?

Use a local file inspector that reads the media metadata in your browser. Media Player Codec Pack's Online File Inspector is designed to inspect supported local files without uploading the media file.

Q: What information should I look for?

Start with the container, video codec, and audio codec. Resolution, frame rate, bit depth, bitrate, channels, and subtitle streams can also explain compatibility or performance problems.

Quick answer

Use a media inspector and look first for container, video codec, and audio codec. Media Player Codec Pack's Online File Inspector can inspect supported local media files in the browser without uploading the media file.

Open Online File Inspector

What to look for

Container

Examples: MP4, MKV/Matroska, MOV/QuickTime, AVI, WebM. The container groups the streams together.

Video codec

Examples: H.264/AVC, HEVC/H.265, AV1, MPEG-2, ProRes, DivX, Xvid. This determines how the picture is decoded.

Audio codec

Examples: AAC, AC3, EAC3, DTS, FLAC, TrueHD, MP3, PCM. This determines how the audio stream is decoded.

Property	Why it matters
Resolution	4K or higher-resolution video can expose hardware or performance limits even when the codec is supported.
Frame rate	High-frame-rate video can be more demanding to decode smoothly.
Bit depth / HDR	10-bit or HDR video may need newer decoding and display paths.
Bitrate	Very high bitrates can stress storage, network, CPU, or GPU performance.
Audio channels	5.1/7.1 layouts can reveal output-device or passthrough configuration issues.
Subtitle streams	Some players handle embedded subtitle formats differently.

Example: what an MKV file might contain

File: movie.mkv\nContainer: Matroska / MKV\nVideo: HEVC / H.265, 3840x2160, 10-bit\nAudio: DTS, 5.1 channels\nSubtitles: SRT

In this example, “MKV support” alone does not tell you whether playback will work. The player also needs to handle HEVC video and DTS audio, and the computer needs enough performance for the particular video.

If the codec is unsupported

Use a player with suitable built-in decoding, add compatible Windows playback support, or convert the file to a more widely supported format.

Video codec help →

If the codec is supported but the file still fails

Check file completeness, corruption, DRM, cloud synchronisation, GPU drivers, output devices, and player configuration rather than installing more codecs.

Troubleshoot the symptom →

Frequently asked questions

How can I check a video codec without uploading the file?

Use a local media inspector. The Online File Inspector reads supported local media in the browser so you can identify its streams without uploading the media file.

What information should I look for first?

Start with container, video codec, and audio codec. Then check resolution, frame rate, bit depth, bitrate, channels, and subtitle tracks when the problem involves performance or partial playback.