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why is compresion wrong
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wavygravy
Newbie
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8. May 2005 @ 23:12 _ Link to this message    Send private message to this user   
hi was wondering why my compreesion on dvd shrink is wrong,i am backing up my live in berlin by roger waters and the size of dvd is 7.58gigs and
shrink is telling me my compression is going to be at 54 percent.Why is this when a 4.7 disc is not 54 percent of the origional size of movie,Any answers would welcome.Oh and by the way dvd clone is telling me its 46 percent
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deadcat
Senior Member
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8. May 2005 @ 23:46 _ Link to this message    Send private message to this user   
because your not working with 4.7gb, your burning to approx 4.3gb

Also, DVD Shrink is able to compress some areas better than others, either way at that much compression the concert isnt going to look that flash in my opinion

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wavygravy
Newbie
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9. May 2005 @ 06:08 _ Link to this message    Send private message to this user   
thanx,but even 4.3 gigs still isnt 54 percent
squizzle
AfterDawn Addict
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9. May 2005 @ 07:38 _ Link to this message    Send private message to this user   
If you convert 7.58GB to actual bytes you get 8,138,963,025 bytes. If you divide 4,464,000,000 (default compressin setting in Shrink) by that you get 54.84%.

DVD Shrink is telling you a ratio of compressed movie to original movie (ie backup is 54% of the size the original is) and Clone is probably telling you the opposite (compressing 46% of movie to fit onto DVD5).

Convert PAL to NTSC or NTSC to PAL------>http://forums.afterdawn.com/thread_view.cfm/167922
ScubaPete's guides------>http://www.dvdplusvideo.com/tutorial007.html
Bbmayo's guides------>http://home.comcast.net/~bbmayo/index.html

My ever-growing movie collection------>http://www.intervocative.com/dvdcollection.aspx/squizzle
Junior Member
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12. May 2005 @ 15:32 _ Link to this message    Send private message to this user   
What is the most compression you should apply in order to fit a 7.4Gb DVD9 movie onto DVD5? I want to backup a few discs to take away on holiday with me and retain the menus using DVD Shrink.

The last time I done this the movie skipped in several places because of the high compression. I think 60% is the limit but I would like be be certain on this. I also applied the setting that gives you higher quality backups when compression is applied and adaptec smooth. I'm guessing that the smooth setting gives better plackback on compressed DVDs but could someone let me know, please?

Any more tips would be appreciated.

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squizzle
AfterDawn Addict
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13. May 2005 @ 06:28 _ Link to this message    Send private message to this user   
Quote:
The last time I done this the movie skipped in several places because of the high compression.
I think skipping is due to poor quality media, imcompatibility between media and player, or multitasking while encoding/burning.

If it is a home-made movie (from a video camera) I would try to keep the compression as low as possible. If you're going to compress that much, I'd definitely use quality enhancements (I'd use Deep Analysis and Max Smoothness).

If you want to split onto 2 DVDRs, DVD Shrink can do that and CloneDVD 2 can do that also, and Clone can preserve menus on both discs. Free 21-day trial is available.

Convert PAL to NTSC or NTSC to PAL------>http://forums.afterdawn.com/thread_view.cfm/167922
ScubaPete's guides------>http://www.dvdplusvideo.com/tutorial007.html
Bbmayo's guides------>http://home.comcast.net/~bbmayo/index.html

My ever-growing movie collection------>http://www.intervocative.com/dvdcollection.aspx/squizzle
Staff Member

2 product reviews
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13. May 2005 @ 06:59 _ Link to this message    Send private message to this user   
When it comes to compression % you need to remember that the audio isn't being compressed at all so the video has to be compressed more than the total disk and that's the number you're seeing. For example, if you had a 7GB movie that had 400MB of audio the entire disc will be compressed to ~62% but the video will be compressed to ~60% of the original.

Rich Fiscus
@Vurbal on Twitter
AfterDawn Staff Writer
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AfterDawn Addict
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13. May 2005 @ 18:35 _ Link to this message    Send private message to this user   
Very true to remember the above. Try and get rid of as much audio as you can, ie: keep the 2ch sound or the 5.1ch, not both. Also, as mentioned, the level of compression does not affect skipping on playback. This is solely a disc writing error of some sort, be it poor quality media, slow computer, bad DVD writer, etc...

Chris

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