User User name Password  
   
Saturday 29.11.2025 / 11:49
Search AfterDawn Forums:        In English   Suomeksi   På svenska
afterdawn.com > forums > archived forums > mpeg-1 and mpeg-2 encoding (avi to dvd) > 800mg onto 700mg cd - how ?
Show topics
 
Forums
Forums
800MG onto 700MG CD - How ?
  Jump to:
 
Posted Message
Junior Member
_
26. October 2004 @ 12:24 _ Link to this message    Send private message to this user   
I've recently obtained a movie in avi format that is almost 800MG in size and lasting 88mins.I'm now in a hurry to save this as my HDD is ready to die.

If I wanted just to save the avi to copy back to my new HDD, would the method be different from a copy that could play back thru a stand alone DVD player.

Could you explain the methods to 'shrink' it onto my 700MG 74min CD's.

Thanks, swog.
aldaco12
AfterDawn Addict
_
26. October 2004 @ 23:30 _ Link to this message    Send private message to this user   
First, a 700 MB CD NOT a 74' CD! (which would be 650 MB). 700 MB CD = 80' CD.
Second, the 'true' CD capacity is measured in SECTORS not in size or length.
The 'true' dimension is 80' CD = 360,000 sectors. 74' CD = 330,000 sectors.
Depending on what you burn into a CD, those sectors can contain 2048 bytes (Data), 2336 bytes (movies), 2352 bytes (Audio OR RAW images, like ISOs or BINs). Tha remaining secors are occupied by EDC and ECC (Error Detection and Correction Codes, which are big for data, zero for sound and RAW images and few - 16 bytes - for movies).
The 'size' is always expressed in Data, this means that 360,000 sectors = 360,000 x 2048 bytes/sector = 737,280,000 bytes = 720 Kb = 703.12 MB . Therefore it often said (wrongly) 'a 80' CD is 700 MB'.
Into a "80' CD", that is a CD with 360,000 sectors, you can fit 360,000 * 2352 = 846,720,000 bytes of RAW data (Audio or images) or 840,960,000 bytes (360,000 * 2336) of movies.
Therefore, into a "80' CD" you can fit about 836,000,000 bytes of MPEG Video-CD (because the VCD image takes some room - 10,600,000 bytes - a little more than the .MPEG but the 'image' can be up to 846,720,000 bytes).
Finally, a 836,000,000 bytes MPEG is a movie about 83'30" long. The problem is that you said "an .AVI 88 minutes". The .AVI is NOT a Video-CD file, but a comèpressed movie (using some codec: DivX, Xvid and so on) and you can fit up to 2hrs of movie in 1 GB of room or 60' of movie in 400 MB (maybe losing some quality of the video)! The 'rule of thumb' is "you can fit max 83' of movie into 1 CD". Unless you can burn a 90' CD in your recorder, or you can overburn some bytes (bur you need a good burner for that), you have to split the movie into 2 CD (as I explained in my "100% working method to make a VCD" 'sticky' thread'.
If you accept to 'lose' some video quality, maybe you can re-compress the original .AVI with DivX into a smaller size .AVI, using a smaller bitrate than the original movie (find the correct bitrate to use with the "DivX bitrate calcullator" and don't use DivX multipass but DivX 1pass.

This message has been edited since posting. Last time this message was edited on 26. October 2004 @ 23:39

Junior Member
_
29. October 2004 @ 05:12 _ Link to this message    Send private message to this user   
Thanks Aldaco, for your reply, very informative and though it didn't all make sense i'm gradually getting my head around it.
What confused me was the fact that I downloaded a AVI that was 700mb I then dragged it to Nero to burn as a VCD on 700mb disc, it didn't fit almost 800mb long.If I follow you correctly its due to the amount of data the different sectors can contain.

Thanks Swog
afterdawn.com > forums > archived forums > mpeg-1 and mpeg-2 encoding (avi to dvd) > 800mg onto 700mg cd - how ?
 

Digital video: AfterDawn.com | AfterDawn Forums
Music: MP3Lizard.com
Gaming: Blasteroids.com | Blasteroids Forums | Compare game prices
Software: Software downloads
Blogs: User profile pages
RSS feeds: AfterDawn.com News | Software updates | AfterDawn Forums
International: AfterDawn in Finnish | AfterDawn in Swedish | AfterDawn in Norwegian | download.fi
Navigate: Search | Site map
About us: About AfterDawn Ltd | Advertise on our sites | Rules, Restrictions, Legal disclaimer & Privacy policy
Contact us: Send feedback | Contact our media sales team
 
  © 1999-2025 by AfterDawn Ltd.

  IDG TechNetwork