Convert RGB Video to UT Video Using FFmpeg

This article provides a quick and direct guide on how to convert an uncompressed RGB video sequence into the lossless UT Video format using the FFmpeg command-line tool. You will learn the precise command syntax to perform this conversion while preserving perfect color accuracy and alpha channels.

Converting a Video File

To convert an existing uncompressed RGB video file (such as an AVI or MOV) to the UT Video format, use the following FFmpeg command:

ffmpeg -i input_rgb.avi -c:v utvideo -pix_fmt gbrp output.avi

Command Breakdown: * -i input_rgb.avi: Specifies the input uncompressed RGB video file. * -c:v utvideo: Selects the UT Video encoder. * -pix_fmt gbrp: Sets the pixel format to planar RGB (8-bit). This is crucial because it prevents FFmpeg from converting your RGB source into a lossy YUV color space, preserving mathematical losslessness. * output.avi: The resulting UT Video file (commonly stored in an AVI or MKV container).

Converting an Image Sequence (RGB)

If your uncompressed RGB sequence is a folder of raw images (such as BMP, PNG, or TIFF files), you can compile them directly into a UT Video file using this command:

ffmpeg -framerate 30 -i frame_%04d.png -c:v utvideo -pix_fmt gbrp output.mkv

Command Breakdown: * -framerate 30: Sets the playback speed of the output video to 30 frames per second. * -i frame_%04d.png: Specifies the input naming pattern (e.g., frame_0001.png, frame_0002.png). * -pix_fmt gbrp: Forces the output to remain in the RGB color space.

Handling Alpha Channels (RGBA)

If your uncompressed RGB source contains transparency (an alpha channel) that you want to preserve, you must use the gbrap pixel format instead:

ffmpeg -i input_rgba.mov -c:v utvideo -pix_fmt gbrap output.avi