Help with Bitrate please...

[gmpman]

I just tried to author a dvd for the first time. The whole process went fine until I tried to burn the disc and my VOB files ended up being 5.7GB. I am burning with sony dru-530A 8x burner and to memorex 8x 4.7GB. I have made a bunch of *.svcd and never had a problem. I used the bitrate calculator and entered the avg value as 5744, the min as 0 and the max at 9668. Those numbers I got from the bitrate calculator.

the *.mpg file I got was 4.5 gb and the *.AC3 file I had was 120,000 kb so why was everything so large? I am just lost here and would appreciate someones help please.

My process:
g-spot
virtual dub
fit-cd
CCE 2.67
Bitrate Calculator
Encode with CCE
PulldownFE batch
AC3 machine
DVD Architect (this is where I found out my file was too large)(the last step)


Peace

[Baldrick]

You can author to your hd and then use dvd shrink to reduce the size.

We need to know the runtime of your video to be able to see if the average bitrate is incorrect.

[gmpman]

Thanks for the fast response, my video runtime is 1:49:04

Here are my settings for the bitrate calc

Video length 1:49:04
Type: DVD
Advanced mode
DVDs:1 x Custom GB custom size 4700 MB Bps 1kb = 1000 bits (should I have changed this to the other value????)
Audio bitrate 224kb/s custom audio 224kb/s x 1 tracks ISO 25MB/DVD (25 MB default)
Video size equals 4399 MB MPEG/author overhead=96 MB Audio size=178 MB ISO= 25MB Total 4700MB

calculated bitrate 5639 DVD max bitrate 9570

Hope that helps, I'll be looking forward to the response

Thanks again

[dafreak]

I calculated ~5200 for average bitrate using 224 kb/s ac3 audio.
9250 max
2050 min

although I usually just leave max and min at 8000 and 2000 respectively.


but like baldrick mentioned, you shouldn't worry too much if it goes over cuz you can just use dvdshrink to shrink it down.

[dafreak]

1 x Custom GB custom size 4700 MB Bps 1kb = 1000 bits (should I have changed this to the other value????

I think this is were you made the error.
1kb=1024 bytes.

4.7 gb dvd-r's does not equal 4700 mb.
1 dvd-r equals 4464-4474 mb

[FulciLives]

As dafreak said the error made was that you used the wrong size for the DVD size.

The bitrate calculator located HERE has a size option called 4.37(DVD5) and that is how big a standard DVD disc is be it DVD-R/RW or DVD+R/RW

Some things to note about using this calculator:

1.) MP2 audio and AC-3 audio are the same size at the same bitrate. LPCM WAV audio is fixed at 1536 but with MP2 and AC-3 you have many options. Most people use AC-3 and I suggest for best quality you go with 256kbps 2.0 AC-3 audio unless you are doing 5.1 AC-3 audio then you should use a bitrate of 448kbps

2.) The 25MB default for ISO is a bit low if you ask me. You are better off being conservative with your bitrate setting than leaning towards the high end. I prefer to set this to 80MB myself. You don't want to risk your final DVD being just a tad too big to fit on a DVD-R

3.) I would consider setting your maximum to no higher than 8000kbps for any bitrate setting associated with MP2 or AC-3 audio. If you are using LPCM WAV audio then you should set your maximum to 7500kbps

4.) Try not to set your minimum bitrate below 2000kbps unless you are using a really low average bitrate (under 3500kbps) then yeah I guess you can try lower but I would still keep it around 1000kbps to 1500kbps

Of course points 3 and 4 apply to multi-pass VBR encoding only. If you do CBR then the highest you should go is 8000kbps with MP2/AC-3 audio or 7500kbps with LPCM WAV audio.

- John "FulciLives" Coleman

*** EDITED ***
Edited for a couple of dumb ass spelling mistakes

[gmpman]

Thanks for the help everyone.....I wasn't sure if I was using that calc right that is why I had to ask. I'm sure that fixed the problem, but if not and I can't figure it out......

I'll be back