First Scale MP4 Videos using VAAPI HW Accel, FFmpeg, and AMD on Linux

First Scale MP4 Videos Using VAAPI HW Accel, FFmpeg, and AMD Linux

In this article, we will discuss how to first scale and then pad MP4 videos using VAAPI hardware acceleration, FFmpeg, and AMD Linux. This process is often referred to as the opposite of the typical "pad and then scale" approach. We will provide a detailed explanation of the key concepts and steps involved in this process, as well as examples of how to implement it using code blocks formatted in the appropriate programming language.

Key Concepts

VAAPI (Video Acceleration API) is an open-source library that allows for hardware acceleration of video processing tasks. It is supported by a wide range of hardware, including AMD GPUs. FFmpeg is a popular, open-source multimedia framework that can be used for tasks such as video encoding, decoding, and processing. By combining VAAPI and FFmpeg, we can take advantage of hardware acceleration to improve the performance of video processing tasks on Linux systems with AMD GPUs.

In this case, we want to first scale the video and then pad it to a specific size. This is the opposite of the typical "pad and then scale" approach, which is often used to maintain the aspect ratio of a video when resizing it. To accomplish this, we will use the "scale" and "pad" filters provided by FFmpeg.

Example Code

Here is an example of how to first scale and then pad an MP4 video using VAAPI HW acceleration, FFmpeg, and AMD Linux:

In this example, the "scale" filter is used to resize the video to a width of 1280 pixels and a height of 720 pixels. The "pad" filter is then used to add black bars to the video, increasing its width to 1920 pixels and its height to 1080 pixels. The "x" and "y" values specify the coordinates of the top-left corner of the padded area, and the "w" and "h" values specify the width and height of the padded area, respectively.

The "-vaapi\_device" option is used to specify the VAAPI device to use for hardware acceleration. In this case, we are using the first available VAAPI device, which is typically the integrated GPU on an AMD APU or the discrete GPU on an AMD GPU. The "-i" option specifies the input video file, and the "-vf" option is used to apply the "scale" and "pad" filters to the video.

The "-c:v hevc\_vaapi" option specifies the codec to use for the output video. In this case, we are using the HEVC (High Efficiency Video Coding) codec, which is also known as H.265. The "-b:v 5000k" option specifies the bitrate of the output video. In this case, we are using a bitrate of 5000 kbps.

• VAAPI is an open-source library that allows for hardware acceleration of video processing tasks.
• FFmpeg is a popular, open-source multimedia framework that can be used for tasks such as video encoding, decoding, and processing.
• By combining VAAPI and FFmpeg, we can take advantage of hardware acceleration to improve the performance of video processing tasks on Linux systems with AMD GPUs.
• To first scale and then pad an MP4 video using VAAPI HW acceleration, FFmpeg, and AMD Linux, we can use the "scale" and "pad" filters provided by FFmpeg.

References

• FFmpeg - Arch Linux Wiki
• Hardware video acceleration - Arch Linux Wiki
• Hardware Acceleration - FFmpeg Trac Wiki

This article includes references to the following types of resources:

• Online articles and documentation