The aim of the study was to identify the problem related to the lack of sound normalization and law regulations in the online streaming. The method was based on analysis of samples of recorded materials from PC's web browser players and Android and iOS apps. Samples were taken from the Polish Internet streaming stations. The data were analysed and the results were compared. The results showed that the loudness of Polish web streaming was very differentiated. There is significant discrepancy in the loudness between the stations. Moreover, in some cases, there are substantial loudness differences between, advertisements, music and programs.
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