I have used the bicubic filter to do the up/down scaling. FFmpeg 46 both of which were used extensively and ImageMagick 47. Here is a simple one-liner that uses the filter_complex to do the resolution change and then computes the VMAF value. The results of this work show that real-time streaming video and image. ffmpeg.exe -i videoToCompare.mp4 -i originalVideo.mp4 -lavfi libvmaf="model_path=vmaf_v0.6.1.pkl":log_path=vmaf_logfile.txt -f null - However, in case the source and destination videos are not of the same resolution, then you have to ensure that the destination is brought to the same resolution as the source video before computing VMAF. All you need to do is point FFmpeg to the location of the VMAF model file and it will do the rest. If your source and destination videos are of the same dimensions (height and width), then you can directly compute the VMAF value using the command line below. How to Compute VMAF using FFmpeg Let's look at a couple of ways of computing VMAF. Now, you can concatenate them using the following FFmpeg command./ffmpeg -f concat -safe 0 -i fileList.txt -c copy mergedVideo.mp4. To understand how to install VMAF, please read our "VMAF Installation" article. FFmpeg and Netflix's VMAF are now part of every video processing and compression engineer's toolbox. It's become very popular as it succeeds (not fully) at automating subjective quality testing that usually requires humans to watch and score videos. Let's go ahead and take a look at these metrics and how they are computed, shall we? What is VMAF? VMAF from Netflix stands for Video Multi-method Assessment Fusion, and it is a video quality metric that combines human vision modeling with machine learning. If you are using FFmpeg in your workflow, it is very easy to compute these metrics instead of purchasing expensive tools. While working on videos (compression or post-processing), it is common to compute objective metrics in addition to doing subjective Visual Quality testing. In this article, let's learn to compute VMAF, PSNR, and SSIM using FFmpeg.
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