In terms of operational paradigm, VQMT and Elecard can compare up to two encoded files to a single source in the GUI with similar command line operation.
In addition, VQMT and Elecard run on the specified operating systems and are primarily single-person tools.
On the downside, VQMT can only compare files of identical resolution, so if you're analyzing lower-resolution rungs on your encoding ladder, you'll have to manually scale them to full resolution first, which takes time and lots of hard disk space.
Hybrik is also much more CPU efficient than MSU VQMT when running VMAF, so it can make more efficient use of all cloud instances.
This is shown in Figure 4, which is the Results visualization screen from the Moscow State University VQMT
, which plots the MSSSIM results for the PERSEUS Sharp clip (in red) and the HEVC clip (in blue) at 1500Kbps.
Briefly, VQMT is an algorithm-agnostic tool that lets you run more than 20 different quality algorithms, or versions of algorithms, including the familiar Peak Signal-to-Noise (PSNR) ratio, and Structural Similarity Index (SSIM).
The GUI can process two files simultaneously (Figure 1), which is amazingly convenient when you're comparing different encoding alternatives and want to view the differences in the actual frames, which the VQMT interface facilitates.
Chart 1 shows the talking head results as measured by the MSU VQMT tool.
Chart 3 (on the next page) shows the VQMT scores for the concert clips, both source and transcoded.
This is an invaluable feature of the VQMT
tool and is particularly great for showing consulting clients the quality differences delivered by the various compression alternatives being analyzed.
These differences were pure gold, particularly because the VQMT
made it a simple matter to view the differences in the files and confirm the results.
Here are the appealing features: First, VQMT
can calculate 19 different objective quality metrics, such as peak signal-to-noise ratio (PSNR), structural similarity index (SSIM), and video quality metric (VQM), which quantify the quality of your encoded files.