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Last update on 03/June/2013 - included additional results for H.264 video subject to transmission losses over IP networks.


The material published in this site is the result of subjective video quality assessment tests that have been performed in IST - Technical University of Lisbon and ISCTE-IUL since April / 2008. Video sequences displayed in the tests have been encoded using H.264 and MPEG-2 encoders. Two different types of artifacts have been considered: artifacts due to lossy encoding and artifacts due to packetized video transmission over error-prone networks.

The main goal of those tests was to obtain truth data useful for the development and evaluation of no-reference video quality metrics.

Accessing the material

Access to the subjective quality data is free. However, the copyright notice must be respected (see below).

If you use this site's material in your research, we kindly ask that you reference this website and/or acknowledge our team (listed below).


The subjective experiments have been designed and supervised by:

  • Prof. Maria Paula Queluz (;
  • Prof. Tomás Brandão (;
  • Eng. Luís Roque  (former MSc. student);
  • Eng. Márcio Gonçalves (former MSc. student);
  • Mr. Rui Almeida (MSc. student).

Additional Information

Additional information on the subjective test experiments (as well as applications) can be found in the following papers:

Copyright notice

Permission is hereby granted, without written agreement and without license or royalty fees, to use the contents provided in this site for research purposes only. In no event shall Instituto de Telecomunicações be liable to any party from direct, indirect, special, incidental, or consequential damages arising out of the use of the data and its documentation. Instituto de Telecomunicações specifically disclaims any warranties. The data provided hereunder is on an "as it is" basis and Instituto de Telecomunicações has no obligation to provide maintenance, support, updates, enhancements, or modifications.