Configure FFmpeg -f Parameter for Rawvideo Muxer

Configuring the -f parameter in FFmpeg to use the rawvideo muxer allows you to export uncompressed, raw video data directly from a source file. This guide explains how to force the raw video format using the -f rawvideo flag, define the necessary video properties like pixel format, and read the resulting raw file back into a playable format.

Using the -f rawvideo Parameter

To output raw video, you must explicitly tell FFmpeg to use the rawvideo muxer by adding -f rawvideo before the output filename. Because raw video files do not contain header metadata (which normally stores resolution, frame rate, and pixel format), you must also specify the desired pixel format using the -pix_fmt flag to ensure the output is written correctly.

Here is the standard command to convert an input video to a raw YUV420P file:

ffmpeg -i input.mp4 -f rawvideo -pix_fmt yuv420p output.yuv

In this command: * -i input.mp4: Specifies the input source file. * -f rawvideo: Forces the output container format to be raw video. * -pix_fmt yuv420p: Sets the pixel format. Other common options include rgb24, rgba, or yuv422p. * output.yuv: The resulting raw output file.

How to Play or Decode Raw Video

Because the output file has no container header, media players cannot automatically detect the video’s dimensions, frame rate, or pixel format. To play or decode the raw file using FFmpeg or FFplay, you must manually specify these input parameters.

To play the raw video file using FFplay, use the following command:

ffplay -f rawvideo -pixel_format yuv420p -video_size 1920x1080 -framerate 30 output.yuv

To convert the raw video back into a compressed container like MP4, use:

ffmpeg -f rawvideo -pixel_format yuv420p -video_size 1920x1080 -framerate 30 -i output.yuv output.mp4

Ensure that the -pixel_format, -video_size (resolution), and -framerate parameters match the exact settings used when the raw file was originally created, otherwise the video will appear distorted or fail to play.