Nearly there !!..Reducing AVI file size to fit on a 700MB CD

[ukcalibrauk]

I am following a guide given via this forum, to reduce the size of an AVI file so that it will fit on a 700MB CD
I used DIVX4 bitrate calculator which gave me 631 as the figure

I entered tis into VirtualDub and set as Full Processing, but the estimated file size; according to the display window during the conversion, says 1448MB

Maybe when it's finished it will actually be 700MB...I don't know...But if it is 1448MB...what did I do wrong

Calibra

PS the frame rate is 25 fps in BRC should this be left as is, do I need to match this to the original file

[Akai Rounin]

What is your chosen AUDIO bitrate then? How long is the movie? Do you intend to leave it as AVI or convert it to MPEG1 for a VCD later? If you do intend to create a VCD, you may find the quality will be better if you simply encode the original huge AVI to MPEG1 instead.

HUN-YA!

Akai Rounin

[ukcalibrauk]

You must realise this is all very new to me. I used the bitrate calculator as suggested, the movie is 2hrs 9 minutes in AVI format. I wish to reduce the size to fit on a single CD. Therefore it will need to be about 10 MB smaller. Using the BRC I selected an 700 MB CD and set the time to 2hrs 9 mins and it gave me a setting of 631 with the audio at 128....I.m not sure what the original audio was, and don't know how to tell.

But when I entered 631 into Virtual dub the resulting file was 1500MB !!!!!


So that is my problem

Plz can you help

[CryptKeeper]

:)

you set the Video to full processing mode

but you forgot to set the codec
you need to select DIVX for encoding

load the movie in virtualdub
press CTRL C
it'll bring up the compression codecs box
look for and click on this on the left side: DIVX ;-) MPEG-4 Low Motion
then click configure

another box will appear with the settings for the codec

use these settings

Options:
keyframes every 10 seconds

Compression Control
slide the bar to 75

Data Rate (Kilobits per second)
slide the bar to 631

click OK and click OK again

set Video to "Full Processing Mode"
set Audio to "Direct Stream Copy"

press F7 and save the avi

video will be encoded to 631 Kbits
while the audio will just be copied into the new file as the original encoding.

everything should work out fine :)
and your new video should be below 700mb's

[ukcalibrauk]

I will try what you said....

The only thing I wasn't sure about was, how did you arrive at the compression rate of 75 !!!

One other slightly related question, if you would be so kind...

When I try to delete the trailer from the beginning of an AVI movie, I load it into VirtualDub, then play, using the 2nd button from the left, then press STOP at the appropiate point, click on the `set this as the start point, then push the slider to the end and select this as the end point and then save as direct stream copy.

Sounds good so far, BUT I can't see any of the video I am editing I can only hear the sound...I would really appreciate if you could explain this

Thanks

Calibra

[ukcalibrauk]

Honest I'm not stupid, but I can't find ehere to enter the settings you proposed

I found Data Rate631 ok

In General parameters there is a Keyframe option, called max keyframe interval, default is 300, should I put the 10 in here ???

Also can't find the compression slider you mentioned....I am using V 1.4...

Calibra

[CryptKeeper]

I will try what you said....

The only thing I wasn't sure about was, how did you arrive at the compression rate of 75 !!!

I began using the compression of 75 when someone from another site mentioned it to Me that the video would be smoother.

One other slightly related question, if you would be so kind...

When I try to delete the trailer from the beginning of an AVI movie, I load it into VirtualDub, then play, using the 2nd button from the left, then press STOP at the appropiate point, click on the `set this as the start point, then push the slider to the end and select this as the end point and then save as direct stream copy.

Sounds good so far, BUT I can't see any of the video I am editing I can only hear the sound...I would really appreciate if you could explain this

Thanks

try pressing F9 or F10
maybe you set it to not show the input and output while you're working in virtualdub

if that's what you mean.

and you mentioned version 1.4?.....1.4 of what virtualdub?

[CryptKeeper]

Honest I'm not stupid, but I can't find ehere to enter the settings you proposed

I found Data Rate631 ok

In General parameters there is a Keyframe option, called max keyframe interval, default is 300, should I put the 10 in here ???

Also can't find the compression slider you mentioned....I am using V 1.4...

Calibra

ummm which codec are you using to encode the video?
and is it version 3.11 alpha or higher of the DIVX ;-) Mpeg-4 Low Motion codec?

[CryptKeeper]

ah ha

I just looked and you're using the divx 5 codec

300 is a good number for max keyframe interval

so leave it as is

and here's the settings from the original site for keyframes

Keyframe
The DivX encoder will automatically insert a key frame every time it detects a scene change. However, long interval between scene changes are possible, and when they occur, the encoder automatically inserts keyframes with user specified frequencies. Keyframes are the largest of all frames, so the frequency of their placement can have a drastic effect on the encoded file. We have found 300 frames to be the maximum interval the encoder should go without inserting a keyframe. This corresponds to at least one keyframe every 10 seconds in a 30 fps stream. Also, depending on the player used, the maximum key frame interval may determine the maximum interval for seeking. This occurs when players are designed to seek to "I" or keyframes. Reducing the keyframe interval can also improve delays and the quality of streaming content.

taken from this page
http://www.divx.com/support/divx/guide.php

[ukcalibrauk]

So

I leave the 300 as is, at least I now understand what it is for

I select 631 bit rate

So where is the 75 setting I need to enter.....

I am using Virtual Dub v1.4......What exactly does the 75 do ???

If I just use the default 300 and 631 I end up with an AVI final file size of 1400MB

So it must be the 75 that reduces the size I guess

I used to think MP3 WAV WMA was complicated, it's got nothing on Video

[mh2360]

Stick with it mate, we have all been through this

[ukcalibrauk]

Then I'll experiment.....

Thanks

[pmcx9]

I just read this and it appears that you are learning how to re-encode just so you can reduce a movie by a few meg.

Why not just cut the end credits off using this http://www.vcdhelp.com/virtualdubedit.htm

then it should fit on a cd

Also try overburning the CD - just goto expert features on Nero.

This will save you hours of messing around

[CryptKeeper]

the 75 is the 50 that is already there for "Scene change threshold"
in General Parameters

slide the bar to 75%

[ukcalibrauk]

Thanks

Calibra