The test system according to the invention for determining processing parameters of audio and/or video data in a mobile-radio device with a test device (10) comprising an audio/video unit (11) which stores the audio/video data and outputs them as audio and/or video data-packets. Moreover, the test device (10) comprises a mobile-radio unit (12), which is connected to the audio/video unit (11), whereas the mobile-radio unit (12) is embodied for the transmission of the audio and/or video data via a mobile-radio interface (17) to a mobile-radio device (30) under test; a detection unit (13), which is connected to the mobile-radio device (30) under test and is embodied in order to detect audio and/or video data; and an analysis unit (14), which is connected to an analysis interface (15) between the audio/video unit (11) and the mobile-radio unit (12) and to the detection unit (13).