PROJECT TITLE: Subjective Video Quality Dependance on Transponder Broadcast Plan and Earth Station Parameters — SVIQUALTES

Coordinator: University Politehnica Bucharest – Research Center for Spatial Information (UPB-CEOSpaceTech) 

Partners: -

Period: 29 November 2013 - 28 November 2016

Project director: Ioan Tache

Project team:


Video Quality Measurement solutions:

Perceptual Video Quality (PVQ) Measurements 

Constant Bit-Rate (CBR) allocation for each TV channel is a simple allocation method, easy to implement, but it doesn’t give the best results in terms of transponder bandwidth efficiency (number of TV channels per transponder). 

The most common bit-rate allocation on each TV channel in the transponder is the statistical multiplexing, that allows more TV channels to be carried by a transponder than in the case CBR allocation. Each TV channel has a Variable Bit-Rate (VBR), assigned on a statistical base. 

PVQ measurements will be performed with real video content broadcasted by satellite TV channels. In this way, the effects of bit-rate allocation for each TV channel in the satellite transponder through statistical multiplexing and channels priority list can be clearly specified. 

For TV satellite providers there is always a tradeoff between the maximum number of TV channels (SDTV or HDTV) per transponder, compression standard (MPEG-2 or MPEG-4) and available bit-rate for each channel at any moment. When there are too many TV channels in the transponder and the video content on many of them requests a high bit-rate at a time, only the channels that are in a higher position on the transponder priority list will receive enough bit-rate from the multiplexer in order to display a good quality image. The rest of the transponder channels will receive lower bit-rates and the image displayed will be affected by over-compression artifacts (e.g. blockiness) even if there are no technical non-compliance errors in the transport stream.  

Project objectives:


Contributions to the STAR programme objectives: