Calculating Bitrate with AC3 Sound

[Bathrone]

Hi folks

So the Divx pro codec comes with a bitrate calculator. As too I know of others around.

My problem is, lets say Im wanting to transcode some vobs into AC3 Divx, and the audio stream is 6ch 48khz 448 Kbs audio.

Is there a bitrate calculator than can handle this? All of them seem to just be based on mp3 or similar 2ch stuff. As a result Im kinda guessing as to my selected bitrate because I cant accurately put in the audio part of it.

[killingspree]

ahmm... well honestly i've never used the divx 6 bitrate calculator, BUT even if it only does it for mp3 files (which, honestly would surprise me quite a bit) calculating the difference by hand, wouldn't be too hard.

an example. if you enter a desired audio bitrate of 128kbit (mp3) and you get a resulting video bitrate of, lets say 1100 kbit, you then have a total bitrate of 1228 kbit... now just take the ac3 file into account instead - the 448 kbit - and you'll end up with a 780 kbit video bitrate for the video...

btw, gk supports bitrate calculations with ac3 files... it doesn't supprt divx6 atm though...

kr
steVe

[mg262]

I've always found Google to be the most flexible bit rate calculator...

you can type something like this:

4.38GB/114minutes - 448 kbps in kbps

to get:

((4.38 GB) / (114 minutes)) - (448 kbps) = 4 923.65249 kbps

[Bathrone]

Thanks all

With a fresh head this morning I managed to search and find this on the web:

http://www.divxland.org/bitcalc.htm

It opens up the AC3 file and handles it nice. Its designed for Divx 5 so Ill do an encode and see how close it is.