5. Bitrate plots

Figures 4 and 5 show plots of the bit rates of the first four minutes of the VOB test file when played and streamed respectively.

Figure 4 : VOB (MPEG 2) file play bitrate plot

The VOB file maximum and average stream rates were about 20% lower than the file play rates. Peak to average rate ratios for both stream and file play were about 1.6.

Figure 5: VOB (MPEG 2) file stream bitrate plot

Figures 6 and 7 show plots of the bit rates of the entire DivX test file when played and streamed respectively.

Figure 6 : DivX file play bitrate plot

This time, the DivX maximum play rate was about 20% lower than the stream rate, while the average rates were probably within the limits of calculation error. The peak to average rate ratio for file play was 4.3 and 4.8 for streaming, the highest of the three files tested.

Figure 7 : DivX file stream bitrate plot