So I'm working out my bit budgeting for a DVD I'm putting together by following the examples given in the Encore help files.
It says there that in order to determine the maximum video data rate, I need to subtract the combined audio data rates (0.192 Mbps x 22 audio files, in this case, which = 4.224) from the maximum DVD video data rate (9.8 Mbps), which comes out to 5.576 Mbps. Is this correct? That is, do I need to multiply the audio data rate times the number of audio tracks there are in my project?
I only ask because I have come to a calculation of a data rate for my video (34,837.888 Mbits available / 4,920 seconds of video = 7.08 Mbps) that is apparently greater than the maximum video data rate for my disc (5.576 Mbps). Should this be possible? If so, do I just set the data rate for my video to 5.576? Have I miscalculated something? Any help you could give me with this problem would be much obliged. Thanks!
Bid budgeting is confusing. You don't need to calculate 0.192 by the number of audio files in your project....just by the number of audio TRACKS you have per timeline. I assume you only have one audio track in each timeline. Audio and video bitrates together can be no more than 9.8Mbps.
The way I calculate a bitrate is as follows.
36096 Mbits / 4920 seconds = 7.3Mbps - 1 audio track (0.192) = 7.1 Mbps.
So 7.1Mbps total bitstream will fill your disc with your 82 minute program that cpntains one video track and one audio track per timeline.
This is the calculation I use all the time and it comes very close (because the video bitrate I use is a variable bitrate)