Compression project.
 Compression project (most info is in Russian) >> About
In English: Video >> Public filters | Com. filters | Video Codecs Comparisons |
Our Video Codecs | Video Quality Metrics     ||     New: Compression Catalog!
  Personal (English) >> V.Yoockin | A.Ratushnyak
In Russian: "Compression Methods" book | Arctest | Download | FIDO | Forum | Links
---------------------------------------------------------
Hot news:
* 4-th H.264 codecs test!
* Million filters downloads!
* Video Quality Metric 1.5!
If you find a spelling error, please select an incorrect text and press Ctrl+Enter. Thank you!
Compression project >> Video Area Home  
RUSSIAN

MSU Quality Measurement Tool: FAQ

MSU Graphics & Media Lab (Video Group)

 

MSU Video Quality Measurement Tool FAQ

  1. What about command-line interface? Does MSU VQM support it?
  2. Your program reports that it failed to open input file.
  3. How can I obtain version for Linux?
  4. What values correspond to better quality for each metric?
  5. Where I can get more information about your own metrics (MSU Blocking/Blurring measure)?
  6. I recieve very strange results for AviSynth scripts. What's wrong?
  7. Why average value of the PSNR is not equal to arithmetic mean of the PSNR values for frames?
  8. Is it possible, to open video files, which are not supported by MSU VQMT directly (.mp4, .mpg, .mov etc.)??
  9. Results are very strange (too low) for one ore more codecs?

  • Q: What about command-line interface? Does MSU VQM support it?
    A: Public version doesn't support command line. We have such feature in PRO version, but it's available only with commercial license.

  • Q: Your program reports that it failed to open input file.
    A: Our tool supports .avi, .yuv, .avs, .bmp files as input. Other filetypes (.wmv, .vob, .mpeg, etc.) can be opened through AviSynth. Detailed information can be found in measure_files_with_directshow.avs and measure_mpeg1_mpeg2.avs in directory with the tool.
    If you experience a problem with .avi, then it is possible that MSU VQM is not compatible with this codec. Please send information about this codec, or part of such avi file (1-2 megabytes) to our e-mail.

  • Q:How can I obtain version for Linux?
    A: Sorry, our program is Windows-only now.

  • Q: What values correspond to better quality for each metric?
    A:
    Metric Values for sequences Interpretation
    Blocking measure 1 value for 1 video Lower values corresponds to lower blocking
    Bluring measure 1 value for 1 vide, 1 visualisation video for 2 input sequences Lower values corresponds to higher blurring.
    Delta 1 value for 2 sequences 0 means, that frames are equal. Positive and negative values means deviation. Lower absolute values are better.
    MSAD 1 value for 2 sequences 0 mean equal frames. Lower values are better.
    MSE 1 value for 2 sequences Lower values are better. 0 for equal frames.
    SSIM 1 value for 2 sequences Higher values are better, 1 for equal frames
    VQM 1 value for 2 sequences 0 for equal frames, lower values are better
    PSNR 1 value for 2 sequences 100 for equal frames, higher values are better


  • Q: Where I can find more information about your own metrics (MSU Blocking/Blurring measure)?
    A: We plan to prepare some paper first and next publish this measurement methods on our webpage.

  • Q: I recieve very strange results for AviSynth scripts. What's wrong?
    A: AviSynth support is unstable, because we have no reference source code for working with AVS files. If measurements are wrong try this:
    • Check our recomendations for AVS scripts.
    • Specify output colorspace using ConvertTo() instruction.


  • Q: Why average value of the PSNR is not equal to arithmetic mean of the PSNR values for frames?
    A: The correct way to calculate average PSNR for the sequence is to calculate average MSE for all frames (average MSE is arithmetic mean of the MSE values for frames) and after it calculate PSNR using ordinary equation for PSNR )

  • Q: Is it possible to open video, which are not supported by MSU VQMT directly (.mp4, .mpg, .mov etc.)?
    A: Our program supports AviSynth, which can be used to open such files. (it could be found in archive with program). Some formats (such as DVD) requires additional plugins for AviSynth. See AviSynth website for more information.

  • Q: Results are very strange (too low) for one ore more codecs?
    A: Some codecs (for example DivX 6.0) shift video file one or two frames back, or make two first frames equal. Check for this shift in your video files after encoding. You can open two encoded videos in two different VirtualDubs. After it go to the 10th frame, for example. And at last switch between them to see are 10th frames in two videos corresponded or not. If shift really exists, use AviSynth scripts with DeleteFrame() and DuplicateFrame() to fix it.

e-mail: 

See also MSU Video Quality Metric

 

Other resources

Video resources:

Public MSU video filters
Here are available VirtualDub and AviSynth filters. Commonly we develop a whole family of some kind of a filter. Generally there are also versions optimized for PC and hardware implementations (ASIC/FPGA/DSP). These optimized versions can be licensed to companies. Please contact us for details via video(at)graphics.cs.msu_ru. 		MSU filters for companies
We are working with Intel, Samsung, RealNetworks and other companies on adapting our filters other video processing algorithms for specific video streams, applications and hardware like TV-sets, graphics cards, etc. Some of such projects are non-exclusive. Also we have internal researches. Please let us know via video(at)graphics.cs.msu_ru if you are interested in acquiring a license for such filters or making a custom R&D project on video processing, compression, computer vision.
Codecs comparisons
Objective and subjective quality evaluation
tests for video and image codecs
Ext. link: x264 parameters efficiency comparison
Video quality metrics
Programs with different objective and subjective video quality metrics implementation
Video codecs projects
Different research and development
projects on video codecs 		Other
Other information

Bookmark this page:   Add to Del.icio.us Add to Del.icio.us     Digg It Digg It     reddit reddit

 
Last updated: 12-October-2007
Search (Russian):
Server size: 7629 files, 938Mb (Server statistics)

Project updated by
Server Team and MSU Video Group

Project sponsored by YUVsoft Corp.

Project supported by MSU Graphics & Media Lab
 
---------------------------------------------------------
  Send your comments to compression_##_graphicon.ru
  © Dr. D.Vatolin, Dr. M.Smirnov, A.Ratushnyak, V.Yoockin, content, 2001-2008
   © A.Andreev, pictures, 2002

Rambler's Top100 Ðåéòèíã@Mail.ru

This document available from http://www.compression.ru/video/quality_measure/vqmt_faq_en.html