Multiple audio bitrate calculator for DVDR?

[Disco Makberto]

Dear all,

Hi! Is anybody of you aware of a bitrate calculator for DVDR et. al. that allows me to input multiple audio bitrates for one resulting video bitrate? I know of some that are supposed to do this, but they assume that the multiple audio bitrates are constant, so they just double (or triple and so on) the calculation for one audio bitrate which remains constant for all audio streams. However, if I want to use different bitrates for the audio streams, like in the case of LPCM and AC3, whose bitrates are obviously different, the calculators I mentioned before don't work. Hence, if you are familiar with a bitrate calculator that works with my settings, please let me know.

Carlos L.
Disco Mak

[guns1inger]

Audio bitrate is constant on a track by track basis for DVD. Just add up the bitrate for all tracks and use that if it has a custom option. Otherwise, encode the audio first, add up the space it all needs, and put this into the extra space section left for menus etc., then set the number of audio tracks to 0 to get the video bitrate.

[Disco Makberto]

Hey, Scott!

I am not sure if I undersand you correctly.

Yes, I know that the audio is constant on a track by track basis. But what about having two audio options that are constant within themselves but each audio option are encoded with different bitrates?

So, let's say that I encode the whole video part with AC3 at 256 kbps. This remains constant for the whole video on a track by track basis. Then, for the second audio, I decide to use MP2 at 384 kbps. This also remains constant for the whole video on a track by track basis. Are you telling me that this is not possible?

In other words, what I would like to achieve is similar to having two audio streams with two different languages, let's say English and Spanish. However, I would like the two languages to be encoded at different bitrates.

Please let me know, and thank you for your help in advance.

CAL
Disco Mak

[manono]

But what about having two audio options that are constant within themselves but each audio option are encoded with different bitrates?

He said to add them up. In your example, 256 + 384 = 640. So, you figure the video bitrate based on an audio bitrate of 640. The bitrate calc in GKnot allows you to input both audios separately. It also has a total one of 660 which is close enough for most purposes.

[guns1inger]

I don't know of one that does what you want. I use VideoCalc (vcalc), which, like most, supports multiple audio tracks on the assumption they are all the same. On the few occasions I have had multiple audio tracks to worry about, I have encoded the audio tracks first, and added up the disc space required for all of them. In vcalc I set the number of audio tracks to 0, and put the total disc space for the audio tracks into the "Space for Extra Files" slot, plus a little extra for menus. The bitrate that remains is for video encoding only.

[Disco Makberto]

Gotcha, my e-buddies! Thanks very much.

CAL or "Disco Mak"