Farhan,
don´t follow the advice accoding to bitrates – this doesn´t work. 9.8Mbit is a much to high bitrate, because of three main reasons:
1. the DVD-spec allow 10MBit for the entire stream (video+audio), for example if you´re using PCM- (uncompressed WAV/AIF) sound your bitrate will be to high and the DVD wont be playable.
2. another reason NOT to use high value bitrates is that every encoder (especially when using single-pass VBR) has bitrate-peaks that are a lot higher than the max. set bitrate.
3. most DVD-player (hardware) are only capable to playback DVD +/-R-media with maximum bitrate at 8.5Mbit, as DVD +/-R does not reflect as much as a replicated disc. the result is that the red laser wont be reflected enough so the disc wont be playing correct.
danny