Abstract: By inserting a downsampling filter between the decoding and re-encoding parts of a transcoder, a reduced resolution transcoding is performed. Before transferring the decoded motion vectors to the encoding part, the motion vectors are processed by additional operations provided in order to take into account the fact that macroblocks before and after the resizing step no longer match.

Abstract: Two supporting elements (3) support a section of the driving belt, and a sensor (10) engages the driving belt in the central region between the supporting elements and deflects this belt towards the imaginary connection line between the supporting elements. In order that different thicknesses of driving belts (2) do not falsify the measuring result, the supporting elements (3) are displaceable and are pressed against the driving belt with a force which is larger than the counterforce applied by the sensor (10). Two stationary engagement elements (11) are arranged directly opposite to the supporting elements (3) so that the driving belt (2) is fixed at two places between a supporting element and the associated engagement element.