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Subsampled raw YUV bitmap image file used in video processing.
File type: Bitmap image file
The .u file is a raw image format that stores subsampled YUV bitmap data, primarily used in digital video and image processing. It is typically opened with specialized video, multimedia, or image editing software that can handle raw YUV data.
Found 5 different file type records with the same u filename suffix.
File type category:
Bitmap image file
Date updated: June 21, 2026
The .u file extension represents a subsampled raw YUV bitmap image, commonly used for storing uncompressed video frame data with chroma subsampling. This format is often utilized in video encoding, decoding, and processing workflows, especially where raw, high-quality image data is required. The YUV color space separates luminance (Y) from chrominance (U and V), and subsampling reduces the amount of color information to optimize storage and transmission efficiency.
These files are often generated by digital cameras, video recorders, or during advanced video editing processes. As a raw format, the .u file contains uncompressed pixel data, making it suitable for high-fidelity processing but requiring compatible software for viewing and editing. It is platform-neutral but typically intended for professional or technical use, requiring specific understanding of its structure for correct interpretation.
Support for the .u format can be found across various multimedia processing tools, especially those geared toward video engineering, such as FFmpeg, VapourSynth, or custom software developed for video research and production. Since it stores raw data, users may need to specify resolution, color subsampling, and pixel format to correctly load and interpret the contents of the file.
To open .u files, specialized video processing or editing software is recommended. On Windows, programs like VLC media player may view raw YUV files but often require additional settings. More reliable options include FFmpeg and VapourSynth, which provide command-line tools to load and manipulate raw data.
On Mac, you can utilize FFmpeg or VLC media player. Linux users also rely on command-line tools such as FFmpeg to view or process these files, often specifying parameters like pixel format, resolution, and chroma subsampling to interpret the raw data correctly.
Converting .u files to more common formats like AVI, MP4, or JPEG can be achieved using FFmpeg, which supports raw YUV data with appropriate command-line options. Online converters are generally unavailable due to the specialized nature of raw formats, so desktop tools are recommended.
To convert, specify parameters such as width, height, pixel format, and color subsampling. For example, using FFmpeg, a typical conversion command might include flags like -f rawvideo, -pixel_format yuv420p, and the desired output format. This process allows embedding raw YUV data into standard video containers or extracting individual frames for further editing.
File type category:
Audio and sound file
Date updated: October 27, 2024
Record marked as obsolete and not updated for a long time.
The u file extension is associated with the AU audio file format.
AU audio file -an audio container format typically used to store encoded audio data. It was introduced by Sun Microsystems and is also used by MusicKit for the NeXT operating system. It contains a header that includes six 32-bit words, an optional information section, then the audio data.
AU files typically use theau.
Use compatible tools to work with *.u files.
Apps designed for playing u files:
Microsoft Windows
File type category:
Various data file
Date updated: May 1, 2012
The U file extension is associated with Nitpicker, a program for gathering internet traffic information. An *.u file contains saved IP flow.
Software applications that handle other tasks involving u files:
Linux/Unix
File type category:
Game file
Date updated: April 30, 2018
The u file extension is related to various video games based on Unreal video gaming engine.
The game uses these small applications (with .u file extension) in combination with the engine to perform numerous tasks.
For instance the 'UTServerAdmin.u' has the task of hosting games, and, if the WWW Admin has been activated on launch, send data to 'UWeb.u', which in turn acts as a gateway between webbased server console and the actual server.
Use Unreal Development Kit to work with *.u files.
Probably cannot be converted to anything else.
Software applications that can open u files:
Microsoft Windows
Software applications that can edit u files:
Microsoft Windows
Software capable of saving u files:
Microsoft Windows
Software apps that create u files:
Microsoft Windows
Software applications that handle other tasks involving u files:
Microsoft Windows
File type category:
Game file
Date updated: May 9, 2019
The u file extension is associated with the Unreal Tournament, a 3D action shooter video game for Microsoft Windows and Apple Mac computers, developed by Epic.
The u file stores various game data.
Probably not meant to be accessed by the user.
Probably cannot be converted to anything else.
Software applications that handle other tasks involving u files:
Microsoft Windows
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