Quantcast Target Filesize is Always Greater than Predicted? - digitalFAQ.com Forums [Archives]
  #1  
02-14-2003, 08:37 PM
alfredini alfredini is offline
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If i calculate a cq with frames/minutes/10*filesize = target filesize e.g. the target Filesize is always greater then predicted. How does the calculation work with a tighter GOP?

Here is my AVS Script:
Code:
LoadPlugin("C:\AVSFilter\Plugins\MPEG2DEC.dll")
LoadPlugin("C:\AVSFilter\Plugins\legalclip.dll")
LoadPlugin("C:\AVSFilter\Plugins\MSharpen.dll")
LoadPlugin("C:\AVSFilter\Plugins\Convolution3D.dll")
LoadPlugin("C:\AVSFilter\Plugins\fluxsmooth.dll")
LoadPlugin("C:\AVSFilter\Plugins\sampler.dll")

AviSource("C:\Anime\GTO1.Avi")
LegalClip()
BilinearResize(336,272,3,0,506,384)
MSharpen()
FluxSmooth(15,10)
AddBorders(8,8,8,8)
LegalClip()
Sampler(length=10)
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  #2  
02-14-2003, 09:17 PM
rendalunit rendalunit is offline
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I'm not positive about this but I think you need to change the prediction formula to Predicted MPEG size = (( Total frames/MovieTimeInMinutes) / 10 ) * MPEG sample file size Someone please correct me if I'm wrong
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  #3  
02-14-2003, 09:19 PM
alfredini alfredini is offline
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Quote:
Originally Posted by rendalunit
I'm not positive about this but I think you need to change the prediction formula to Predicted MPEG size = (( Total frames/MovieTimeInMinutes) / 10 ) * MPEG sample file size Someone please correct me if I'm wrong
This is what i am doing without getting usable results
Plz suggest anything! and i will try it
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  #4  
02-14-2003, 09:29 PM
rendalunit rendalunit is offline
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is Detect scene change unchecked in Tmpg?
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  #5  
02-14-2003, 09:34 PM
alfredini alfredini is offline
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yes... unchecked.
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  #6  
02-14-2003, 09:47 PM
rendalunit rendalunit is offline
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that's really weird Have you tried sampler(length=24)?
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  #7  
02-14-2003, 09:51 PM
alfredini alfredini is offline
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Quote:
Originally Posted by rendalunit
that's really weird Have you tried sampler(length=24)?
yes... with length=24 and GOP(max)=24 i get the predicted filesize but not with gop=10 (or 12 or 15)
What.... can... i.... do.........????? hm....
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  #8  
02-14-2003, 10:04 PM
kwag kwag is offline
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Quote:
Originally Posted by alfredini
If i calculate a cq with frames/minutes/10*filesize = target filesize e.g. the target Filesize is always greater then predicted. How does the calculation work with a tighter GOP?
The tighter the GOP, the less the compression, and the more samples must be taken. 10 is just not enough frames for an accurate calculation unless you take many more samples. Try taking 250 samples of 10 frames.

-kwag
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  #9  
02-14-2003, 10:29 PM
alfredini alfredini is offline
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Quote:
Originally Posted by kwag
The tighter the GOP, the less the compression, and the more samples must be taken. 10 is just not enough frames for an accurate calculation unless you take many more samples. Try taking 250 samples of 10 frames.

-kwag
You mean something like:
Code:
IL = Framecount / 250
SL = 10 
SelectRangeEvery(IL,SL)
??????
How would be the prediction formula then?
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  #10  
02-15-2003, 01:01 AM
rendalunit rendalunit is offline
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i think you could do that like this: sampler(samples=250, length=10)

then the formula would be (FrameCount*SampleSize) / (NumberOfSamples*SampleLength) = PredictedFileSize
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  #11  
02-15-2003, 01:34 AM
jorel jorel is offline
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Quote:
Originally Posted by rendalunit
i think you could do that like this: sampler(samples=250, length=10)

then the formula would be (FrameCount*SampleSize) / (NumberOfSamples*SampleLength) = PredictedFileSize
really good rendalunit,i will try it !
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  #12  
02-15-2003, 08:58 AM
alfredini alfredini is offline
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Thanks rendalunit i'm going to try it
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  #13  
02-15-2003, 10:06 AM
alfredini alfredini is offline
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it works it works yoohoo... thanks again kwag and rendalunit
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  #14  
02-15-2003, 10:43 AM
jorel jorel is offline
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Quote:
Originally Posted by alfredini
it works it works yoohoo... thanks again kwag and rendalunit
yes,yes.......(i'm without words)...it's really

thank you !!!!!!!
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  #15  
02-15-2003, 01:58 PM
jorel jorel is offline
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Quote:
Originally Posted by rendalunit
i think you could do that like this: sampler(samples=250, length=10)

then the formula would be (FrameCount*SampleSize) / (NumberOfSamples*SampleLength) = PredictedFileSize
hey rendalunit,
i lost something...

can you post a "sample script" with "numbers" please?
and deserve

thanks in advance friend!!!
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  #16  
02-15-2003, 02:32 PM
rendalunit rendalunit is offline
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sure, jorel
I'm doing "signs" now with this script
Code:
LoadPlugin("D:\encoding\MPEG2DEC.dll")
LoadPlugin("D:\encoding\FluxSmooth.dll")
LoadPlugin("D:\encoding\blockbuster.dll")
LoadPlugin("D:\encoding\legalclip.dll")
LoadPlugin("D:\encoding\sampler.dll")
LoadPlugin("D:\encoding\Dustv5.dll")
LoadPlugin("D:\encoding\Convolution3D.dll")

SampleSize=11.966
CQ=73

MPEG2Source("C:\Signs\VIDEO_TS\signs.d2v")
LegalClip()
BicubicResize(512,344,0,0.6,3,0,714,480)
SpaceDust()
FluxSmooth()
#Blockbuster(method="noise", variance=0.5, seed=1)
AddBorders(8,68,8,68)
LegalClip()

trim(Round((Framecount/2)-((Framecount/10)/2)),Round((Framecount/2)+((Framecount/10)/2)))
Prediction("Signs", 1, 0.99, SampleSize, CQ, MinAudioBitrate=128).  Sampler(length=24) 


#------------------------------#
# Prediction Function          #
#------------------------------#

function Prediction (clip c, string "movie", int "cds", float "factor", float "SampleSize", float "CQ", int "MinAudioBitrate")

{
movie = default(movie,"No_Title_Defined")
factor = default(factor,0.98)
cds = default(cds,0)
SampleSize = default(SampleSize,0)
CQ = default(CQ,0)
MinAudioBitrate = default(MinAudioBitrate,128)      # lowest audio bitrate wanted

MovieLength  = framecount(c)/framerate(c)
FramesTotal  = framecount(c)
FramesSample = framecount(Sampler(c,length=24))
CD_Size = 814080*cds  #1CD=795MB -> (video+audio)


MinAudio = (((((CD_Size-((MinAudioBitrate/8)*Movielength))*FramesSample)/FramesTotal)*factor))/1000
EncodedSample = (SampleSize==0)? false: true     #--------------------------------------------------------------------
SampleSize = (SampleSize==0)? 1: SampleSize    # if sample size =0 mb then no previous sample.
CQ = (CQ<=0)? 1 :CQ                                          # set cq between 1-100                                                         
CQ = (CQ>100)?100 : CQ                                     #---------------------------------------------------------------------
SampleSizeMessage=(EncodedSample==false)?"no sample encoded yet **********": "Sample Size (mb) : "
SampleCQMessage=(EncodedSample==false)?"no sample encoded yet **********":"Sample CQ : "
TryCQValueMessage=(EncodedSample==false)?"no sample encoded yet ******":"Try CQ value of : "

d=BlankClip(c,1,544,480).

\Subtitle(movie, 272,40, halo_color=$00CCCC, text_color=$FFFFFF, font="Courier", size=27, align=5).

\Subtitle("Total Frames : " + String(FramesTotal), 80,60).
\Subtitle("Sample Frames : " + String(FramesSample), 80,80).
\Subtitle("Time (sec) : " + String(round(Movielength)), 80,100).
\Subtitle("Time (min) : " + String(round(Movielength/60)), 80,120).

\Subtitle(SampleSizeMessage+LeftStr(String(SampleSize),5), 270,60,text_color=$FF0000).
\Subtitle(SampleCQMessage + LeftStr(String(CQ),4),270,80,text_color=$FF0000).
\Subtitle("Min. Audio Bitrate : "+ String(MinAudioBitrate)+" kbps",270,100,text_color=$FF0000).
\Subtitle("Desired Sample Size (mb) : " + LeftStr(String(MinAudio),5),270,120,text_color=$FF0000).
\Subtitle(TryCQValueMessage + LeftStr(String((MinAudio*CQ)/SampleSize),4),270,140,text_color=$FF0000).

\Subtitle("Desired Sample Size (mb)  for  " + String(cds) + " CD(s):", 80,165, text_color=$FFFFFF).
\Subtitle("- audio at  96 kbps : " + LeftStr(String((((((CD_Size-((096/8)*Movielength))*FramesSample)/FramesTotal)*factor))/1000),5),80,185).
\Subtitle("- audio at 112 kbps : " + LeftStr(String((((((CD_Size-((112/8)*Movielength))*FramesSample)/FramesTotal)*factor))/1000),5),80,205).
\Subtitle("- audio at 128 kbps : " + LeftStr(String((((((CD_Size-((128/8)*Movielength))*FramesSample)/FramesTotal)*factor))/1000),5),80,225).
\Subtitle("- audio at 160 kbps : " + LeftStr(String((((((CD_Size-((160/8)*Movielength))*FramesSample)/FramesTotal)*factor))/1000),5),80,245).
\Subtitle("- audio at 192 kbps : " + LeftStr(String((((((CD_Size-((192/8)*Movielength))*FramesSample)/FramesTotal)*factor))/1000),5),80,265).
\Subtitle("- audio at 224 kbps : " + LeftStr(String((((((CD_Size-((224/8)*Movielength))*FramesSample)/FramesTotal)*factor))/1000),5),80,285).

\Subtitle("Average Bitrate (kbps) : "+ String(Round(((((CD_Size-((128/8)*Movielength)))/Movielength)*8)*1)), 80,328).

\Subtitle("Predicted Audio File Sizes (mb):", 80,373, text_color=$FFFFFF).
\Subtitle(" 96 kbps = " + String(Round(((( 96*1024)/8)*Movielength)/1048576)),80,395).
\Subtitle("112 kbps = " + String(Round((((112*1024)/8)*Movielength)/1048576)),80,416).
\Subtitle("128 kbps = " + String(Round((((128*1024)/8)*Movielength)/1048576)),80,437).
\Subtitle("160 kbps = " + String(Round((((160*1024)/8)*Movielength)/1048576)),270,395).
\Subtitle("192 kbps = " + String(Round((((192*1024)/8)*Movielength)/1048576)),270,416).
\Subtitle("224 kbps = " + String(Round((((224*1024)/8)*Movielength)/1048576)),270,437).

\BilinearResize(width(c), height(c))
return d+c+d
}
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  #17  
02-15-2003, 02:37 PM
jorel jorel is offline
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thanks friend "ren" (friendalunit)!
now i need time to read and understand it all!

it's..... for me.
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  #18  
02-16-2003, 12:57 AM
jorel jorel is offline
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rendalunit,please my friend:

how can i use this "formula":
(FrameCount*SampleSize) / (NumberOfSamples*SampleLength) = PredictedFileSize

i got this script using fitcd:
(i'm thankfull to Kwag and muaddib that helps me a lot to learn(all) fitcd):

LoadPlugin("D:\convert\FitCD_v1.0.5_Prediction&Fil ters_v0.2\MPEG2DEC3.dll")
LoadPlugin("D:\convert\FitCD_v1.0.5_Prediction&Fil ters_v0.2\legalclip.dll")
LoadPlugin("D:\convert\FitCD_v1.0.5_Prediction&Fil ters_v0.2\decomblegacy.dll")
LoadPlugin("D:\convert\FitCD_v1.0.5_Prediction&Fil ters_v0.2\dustv5.dll")
LoadPlugin("D:\convert\FitCD_v1.0.5_Prediction&Fil ters_v0.2\temporalcleanerold.dll")
LoadPlugin("D:\convert\FitCD_v1.0.5_Prediction&Fil ters_v0.2\blockbuster.dll")
LoadPlugin("D:\convert\FitCD_v1.0.5_Prediction&Fil ters_v0.2\sampler.dll")

Mpeg2Source("D:\convert\352x480\01.d2v")
LegalClip()
FieldDeinterlace()
LanczosResize(352,480,8,0,704,480)
SpaceDust()
TemporalCleaner()
Blockbuster(method="noise", variance=.3, seed=1)
#AddBorders(0,0,0,0)
LegalClip()

Sampler(length=24)
## MPEG size = ((Total frames/MovieTimeInMinutes)/24) * MPEG sample file size ##

with:
166274,
93 minutes
/24

got 8,61mb(m2v)
and with headAC3 = 105 mb(mp2)(it's musical and i encode in 160)

then how can i apply this "formula"?

i need a "pratic" to use this for all encodes.

oh yes,of course...


and and i deserve lots of....


please don't be with me friend.

thanks a lot in advance!
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  #19  
02-16-2003, 02:15 AM
rendalunit rendalunit is offline
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Quote:
Originally Posted by jorel
how can i use this "formula":
(FrameCount*SampleSize) / (NumberOfSamples*SampleLength) = PredictedFileSize

Sampler(length=24)
## MPEG size = ((Total frames/MovieTimeInMinutes)/24) * MPEG sample file size ##

with:
166274,
93 minutes
/24

got 8,61mb(m2v)
and with headAC3 = 105 mb(mp2)(it's musical and i encode in 160)
(FrameCount*SampleSize) / (NumberOfSamples*SampleLength) = PredictedFileSize

Framecount = 166274
Samplesize = 8.61 mb

NumberofSamples = 93
SampleLength = 24

(166274 * 8.61) / (93 * 24) =
1431619.14 mb / 2232 frames = 641.4mb + 105 mb(audio@160kbps) = 746mb

what musical is it? I love music from all the lands
-ren
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  #20  
02-16-2003, 02:47 AM
jorel jorel is offline
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:yippie:

thanks my "friendalunit" you're fantastic!!!!!!

with your guide i will get what i need now!!

the musical is "night in eden"(Sarah Brigthman)(write "brightman"? )
and after this i will:
la luna (of Sarah too,really cool)
jimi hendrix(all that i got)
led zep(the song remains the same)
roy orbison(black&white night)
and i'm search for beatles(let it be)
rush.....santana
and tons more!

do you like this?
the reason i use 160mp2 and maybe turn to 192 is musicals.
i extract the ac3 to wave,go to sound forge and t-racks,
turbo and clean all that need and encode again in headAC3he to mp2
and normalize to 95%.the result is a clear sound.
i have special atention to quality not for volume,than i normalize to 95%.
sounds like a soft wind.

thanks again friend rendalunit!
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