Performing NVIDIA GPU Scaling with FFmpeg using ddgrab (Windows)

Performing NVIDIA GPU Scaling with FFmpeg using ddgrab (Windows)

In this article, we will discuss how to combine options related to screen grabbing with ddgrab and FFmpeg, and encoding using the NVIDIA NVENC scaling process. This guide will provide detailed instructions on how to successfully capture your desktop using these tools on a Windows system.

What is ddgrab and FFmpeg?

ddgrab is a command-line tool for capturing video from a variety of sources, including the desktop. FFmpeg is a powerful, open-source multimedia framework that can be used for a wide range of tasks, including video and audio encoding, decoding, and processing.

Using ddgrab with FFmpeg

To capture video from the desktop using ddgrab and FFmpeg, you will need to use the following command:

This command uses ddgrab to capture video from the desktop in YUV420P format at a size of 1920x1080 and a framerate of 30. The video is then piped to FFmpeg, which encodes it using the NVIDIA NVENC hardware accelerator. The output is saved as an Matroska file named "output.mkv"

Using the NVENC Scaling Process

The NVENC scaling process can be used to improve the performance of video encoding by offloading the scaling task to the NVIDIA GPU. To use the NVENC scaling process with FFmpeg, you will need to add the following options to the command:

These options tell FFmpeg to use the NVIDIA NVENC hardware accelerator for encoding, and to use the "slow" preset for the best possible quality. The -rc vbr\_hq option sets the rate control to variable bitrate with a high quality setting. The -b:v, -maxrate, and -bufsize options set the bitrate, maximum bitrate, and buffer size for the encoded video.

• ddgrab is a command-line tool for capturing video from a variety of sources, including the desktop.
• FFmpeg is a powerful, open-source multimedia framework that can be used for a wide range of tasks, including video and audio encoding, decoding, and processing.
• To capture video from the desktop using ddgrab and FFmpeg, use the command: ddgrab -devices 0 -format yuv420p -size 1920x1080 -framerate 30 -i desktop0 | ffmpeg -hwaccel\_device 0 -i pipe:0 -c:v h264\_nvenc -preset slow -rc vbr\_hq -b:v 5000k -maxrate 5000k -bufsize 5000k -f matroska output.mkv
• To use the NVENC scaling process with FFmpeg, add the following options to the command: -hwaccel\_device 0 -c:v h264\_nvenc -preset slow -rc vbr\_hq -b:v 5000k -maxrate 5000k -bufsize 5000k

References

• FFmpeg
• ddgrab
• NVIDIA Video Codec SDK

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