Which GB# to use to calculate ReMPEG %

[Chumboy]

in order to determine the % reduction in ReMPEG, which number do i use when viewing the files in Windows Explorer?

highlight files
rightclick
properties

there are 2 different numbers...GB and bytes.
ie...4.92GB (5,288,120,320 bytes)

to determine the %, you use this equation: 4400 / total vob size

i guess my question is...how was the 4400 calculated?

in GB or bytes?

[vwo]

the 4400 was just a ball park number used in the "earlier" days... there is free calculator (that you can download from the Doom site) that will do the numbers for you a lot more accurately... keep in mind that the DVD calc uses bytes and seconds, and you should be okay.

[mrpeg]

I use the larger number which is the actual number of bytes in the movie and then try to get my movie down to 4.5 gigs (4.6 would work but you're getting too close). When you reduce a movie with Rempeg you only reduce the video part and not the audio so for an accurate calculation you must calculate with the audio like this: the number of secs in you movie say 7500. Then calculate how big the audio tracks are. You can play the movie in PowerDVD and find out that English track 1 is 384 kbps and French track 2 is 384 and Director's track 3 is 192 kbps. That totals out to 960 kbps (kilo BITS per sec) times 7500 seconds is 7,200 kiloBITs. Divide by 8 and you get 900 kiloBYTES total audio size. Now if your movie was 5,985,000 bytes subtract the audio 900,000 and you get a video only size of 5,085,000 bytes. My target size is 4,500,000 and I will keep the English audio, track 1 say which is 384 kbps*7200/8=345,600 bytes. Target 4,500,000-345,600=4,154,400 for video portion. Original video (minus audio) 5,085,000 and new video (less audio I'm keeping) 4,154,400. Divide 4154400 by 5085000 and you get your percentage for ReMpeg 81.7% in this case. I have found this method accurate to within 40 megs on a movie. (we stll are not taking subtitles into account)

[cz0840]

Its simple math folks, just use MS window explorer's file size by selecting all the files you want to transcode (4.38G = 4.7 billion bytes) and do the following:

Add all the VOB files together you plan to transcode (i.e. 5.47 Gb) and then:

4.3 G / (i.e. 5.47 G) X 100 = 78.6

But to be sure I subtract 3 percent more:

4.3 G / (i.e. 5.47G) X 100 - 3 = 75.6 or 76%

This works everytime and I never have files add up to more than 4.38 G which will fit perfectly on a DVD-R.

[Chumboy]

i've tried the simple division method and, although it does come out to be less than 4.3gig everytime, i always have 300-400 meg left over.

from the posts i've read, you need to consider 3 things:

total movie size
total movie runtime (get this from ReMpeg)
average bitrate (get this from ReMpeg)

i've picked apart a few posts and developed a spreadsheet to calculate the ReMPEG % rate.

just enter these 3 figures and the % appears in the green box.

i've attached the spreadsheet.
try it and let me know if it needs tweaking.

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can't seem to attach the zip file...hmmm.

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here it is...added "enter number of streams to strip"...very important. using this, i end up with 4.2-4.3gig every time.

[cz0840]

Whats the difference between loosing 300-400 Mb when taking the whole movie size in context anyway............

[Chumboy]

300-400 meg....not much relatively.

but every bit counts on some discs.

[Streetcleaner]

Hi!
for the germans there is a bitrate calculator by MCP on my page for download.

Greetz
Streetcleaner