Reducing AC3 files

Sargondvd · 18th November 2002, 14:14

Hi all

What program to use to reduce the size if the AC3 files to lower bit rate ,and put back to AC3 for Maestro. ( directors comments track)

what is the lowest bit rate that should be considered.

what space is it likly to save on say a 250mg file?
available space on the DVD is very very tight for the title i am working on.

regards

slk001 · 18th November 2002, 23:13

Well, if your original bitrate was 384kbps, and you change it to 192kbps, then the new file size should be roughly half the original. There's a pattern here that shouldn't be too difficult to figure out.

For audio only, 128kbps or even lower will work okay for you. You may want to experiment to determine what is your threshold bitrate for acceptable quality of your audio.

auenf · 19th November 2002, 10:57

http://www.dolby.com/tech/

there is one specific one that will give you the optimum bitrate for each audio mode (1/0, 2/0, 3/0, etc), but its sitting on my computer at work and i cant remember the name.

Enf...

Sargondvd · 19th November 2002, 11:17

what program will allow ac3 to ac3 , but change the sample rate ?

benf2 · 20th November 2002, 03:42

SONIC FOUNDRY SOFT ENCODE ALLOWS U TO LOWER THE BIT RATE OF AC3 FILES

foxmolder · 20th November 2002, 10:50

I would try AC3Machine and BeSweet

LB · 1st December 2002, 20:24

I second the besweet idea. There is no EASY way to convert to AC3 if you are new to it. It's going to require some reading on your behalf. The best way is to get ahold of besweet. If you can learn how to use that, it can do a lot more too. It's basically a gui that functions around many programs. So, if you can learn how to use it, you can convert any audio source (being realistic) you have to any output you desire.

Only thing I found it had problems with was mpa to ac3. I got some crackles. Best way around this was to convert the mpa to a wav file first and then feed it through besweet.

LB

Sargondvd · 2nd December 2002, 00:25

AC3machine works well , but i find that it drops the volume a lot ,

besweet seems to require ac3 to wav , wav back to ac3 , ill take further look , but ac3machine gies me an ac3 output easly , just that volume output is very low

regards

UTec · 2nd December 2002, 09:14

Did you try experimenting with the Dynamic compression and Gain settings?

Sargondvd · 3rd December 2002, 00:12

no not much, any good guide for settings for say 6 channel ac3 and 2ch ac3 , most of the ac3 tracks i reduce are those other than english or commontary tracks

regards

18th November 2002, 14:14	#1 \| Link
Sargondvd Registered User Join Date: Oct 2002 Posts: 42	Reducing AC3 files Hi all What program to use to reduce the size if the AC3 files to lower bit rate ,and put back to AC3 for Maestro. ( directors comments track) what is the lowest bit rate that should be considered. what space is it likly to save on say a 250mg file? available space on the DVD is very very tight for the title i am working on. regards

19th November 2002, 10:57	#3 \| Link
auenf avatar doesn't support IE Join Date: Feb 2002 Location: The Great Southland Posts: 2,238	http://www.dolby.com/tech/ there is one specific one that will give you the optimum bitrate for each audio mode (1/0, 2/0, 3/0, etc), but its sitting on my computer at work and i cant remember the name. Enf... __________________ Sometimes I get halfway through a paragraph explaining something, then I just completely forget what I was thinking about which is when you will notice that the paragraph just ends rather abruptly...

1st December 2002, 20:24	#7 \| Link
LB Registered User Join Date: Feb 2002 Posts: 285	besweet I second the besweet idea. There is no EASY way to convert to AC3 if you are new to it. It's going to require some reading on your behalf. The best way is to get ahold of besweet. If you can learn how to use that, it can do a lot more too. It's basically a gui that functions around many programs. So, if you can learn how to use it, you can convert any audio source (being realistic) you have to any output you desire. Only thing I found it had problems with was mpa to ac3. I got some crackles. Best way around this was to convert the mpa to a wav file first and then feed it through besweet. LB __________________ 1. CPUs:2x2.4_LV @ 3.6 (16x229) 1.5v MB:DH800 HS:E3W-NPTXS-04 CRT:FP2141SB HDs:8x147gbU320 1x36gbU320 2x250gbIDE GPU:X800XT DVDRW:PX-712A PSU:2xAntec 550w CASE:PC-78 2. CPUs:1x2.4A @ 3.0 MB:SFF SB61G2BV3 CRT:KVM(see above) HDs:2x120gb IDE GPU:Ti4600 DVDRW:A107 3. Notebook:T40p

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

18th November 2002, 23:13	#2 \| Link
slk001 Registered User Join Date: Apr 2002 Posts: 399	Well, if your original bitrate was 384kbps, and you change it to 192kbps, then the new file size should be roughly half the original. There's a pattern here that shouldn't be too difficult to figure out. For audio only, 128kbps or even lower will work okay for you. You may want to experiment to determine what is your threshold bitrate for acceptable quality of your audio.

19th November 2002, 11:17	#4 \| Link
Sargondvd Registered User Join Date: Oct 2002 Posts: 42	what program will allow ac3 to ac3 , but change the sample rate ?

20th November 2002, 03:42	#5 \| Link
benf2 Registered User Join Date: Dec 2001 Posts: 340	SONIC FOUNDRY SOFT ENCODE ALLOWS U TO LOWER THE BIT RATE OF AC3 FILES

20th November 2002, 10:50	#6 \| Link
foxmolder Registered User Join Date: Oct 2002 Posts: 6	I would try AC3Machine and BeSweet

2nd December 2002, 00:25	#8 \| Link
Sargondvd Registered User Join Date: Oct 2002 Posts: 42	AC3machine works well , but i find that it drops the volume a lot , besweet seems to require ac3 to wav , wav back to ac3 , ill take further look , but ac3machine gies me an ac3 output easly , just that volume output is very low regards

2nd December 2002, 09:14	#9 \| Link
UTec Registered User Join Date: Jul 2002 Posts: 40	Did you try experimenting with the Dynamic compression and Gain settings?

3rd December 2002, 00:12	#10 \| Link
Sargondvd Registered User Join Date: Oct 2002 Posts: 42	no not much, any good guide for settings for say 6 channel ac3 and 2ch ac3 , most of the ac3 tracks i reduce are those other than english or commontary tracks regards