We consider centralized cross-layer resource allocation for a device-to-device (D2D) video transmission system, given knowledge of the channel state information and the rate distortion information of the video streams, and propose an iterative algorithm for subcarrier assignment and power allocation. In the resource allocation, the performance improvement by applying the exact symbol error rate (SER) is compared with the conventional signal-to-interference-plus- noise-ratio (SINR) based SER evaluation method that uses a Gaussian approximation (GA) for the aggregated interference. An exact SER expression for a D2D system using multicarrier bandlimited QAM is derived and then used in the resource allocation algorithm. Bit-level simulations for different numbers of D2D pairs demonstrate a considerable improvement on user capacity and video peak signal-to-noise ratio by incorporating the proposed SER expression compared to the GA.