For instance, taking a look at the H.264 codec, a split in a frame differently than a key-frame (B or P frames) could end up in an useless video file as the other frames depend on information registered in the key frame. Another problem comes with the synchronization of audio and video as the frame size of each one may not be equal.
VI. EXPERIMENTAL EVALUATION
In this section we show the evaluation of the mobile user experience using cloud services. The evaluation is divided into two parts. First, mobile user experience improvements such as zooming, segment-based and tag-based browsing are evaluated in a user study. Second, the advantages of video processing in the cloud are compared, especially the advantages of chunk based processing in comparison to single file processing. MVCS client has been implemented for the Android platform. We used HTC Desire smartphone with Android OS version 2.2, 3.7 inch wide screen multi-touch display with 480x800 pixels