prediction with vmesquita guide 2.0?
I have followed the guide of vmesquita in order to calculate the sample. my dates are the following:
1st movie - 210.226frames 176m 2nd movie - 146.599frames 98m then: audio 1 - (192kbps) - 247,5 Mb audio 2 - (192Kbps) - 137,8 Mb audio total = 385,3 Mb therefore: 4482-200(overmux)-386(audio) = 3896 Mb 356825(total frames)/274/15=86.8187 3896/86.8187=44.87 mb (45952Kb) therefore I have used: for 1st movie sample: 32892 2nd movie - sample: 12697 12697+32892 = 45589 < 45952 after encoder I have got for 1st. movie (only mpv): 3,136,910 Kb (3063.4 Mb) 2nd. movie (only mpv): 1,225,433 Kb (1196.7 Mb) therefore: 1196.7+3063.4 (video)+ 385,3 (audio)+ 200 (overmux) = 4845,4 Mb > > > 4482 Mb if I have not made errors, the proposed system does not work! :evil: How ever I got a mistaken prediction? by[/b] |
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Someone has never used this method?
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hy zagor!
:wink: please, i have some doubts, answer me: if: 1st movie - 210.226frames 176m 2nd movie - 146.599frames 98m then you wrote: "therefore I have used: for 1st movie sample: 12697 2nd movie - sample: 32892 " and in the final: " after encoder I have got for 1st. movie (only mpv): 1,225,433 Kb 2nd. movie (only mpv): 3,136,910 Kb" how the final size of the 1st movie have less size than 2nd movie? :? maybe the reason is that you got "for 1st movie sample: 12697" and "2nd movie - sample: 32892 " that is strange too because the 1st movie have more size than the 2nd movie but in the final, the 2nd movie have more size than the 1st movie! 8O something is wrong in your prediction, don't? :? |
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ok, jorel
i have edited my previous post. I had invert simply the two values. :oops: thanks |
right zagor.
i follow your steps and the vmesquita guide and can't find anything wrong now only the final sizes of course! :arrow: using the values that you found after prediction ! i'm still think that have something strange, take a look: see the proportional frames from 1st movie and the 2nd movie..., 1st movie - 210.226frames 176m 2nd movie - 146.599frames 98m the 1st have ~double size/time of the 2nd but the final size of the 1st is too big comparing with the final size of the 2nd ! means...more than double size of the 2nd. 1st. movie (only mpv): 3,136,910 Kb (3063.4 Mb) 2nd. movie (only mpv): 1,225,433 Kb (1196.7 Mb) 1st movie have 1839,7 MB more than 2nd movie. the proportion, comparing with the sources is lost! :? better is wait for vmesquita, he will help us! :wink: :? |
FYI : did you see that Vmesquita acutally did a calc that give aotumatically the wanted sample size according to parameters of the video you plan to encode ?
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I think that there is an error in the formula.
4482-200(overmux)-386(audio) = 3896 Mb 356825(total frames)/274/15=86.8187 (why?) 3896/86.8187=44.87 mb (45952Kb) I think that it's need to proceed in this way: 4482-200(overmux)-386(audio) = 3896 Mb 3896/100=38.96 mb :arrow: because when use sampler (lenghth=15) in the script, I have the relative sampling to 1/100 of frames totals of the movie!!! it's all right? |
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That is why in you case (274 minutes and length = 15) you have the formula : 356825(total frames)/274/15 If you thought that sampler gives you exactly 1/100 of the total frame number it's probably because 176/25*15 = 105.6 (~100) In other words, that is just a coincidence. |
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I have dowloaded the calc file, and as I said before: 8O
Desired Sample Size is 38.8744 Mb :idea: I can't post the image but it's so! ....and this is not a coincidence!!! :D [/quote] |
Ok, I found where your problem is :
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176 min * 60 * 25 = 264000 (and not 210266) and 210266 / 60/25 = 140 min (and not 176) Your error is there ! ;-) |
right Phil!... :D
the guide need corrections or i loose something?!?!? i can't find it there for pal or ntsc sources. :? :?: |
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But this is an EXAMPLE ! That is not a matter if an exemple isn't realist. The goal is to make understand the IDEA. And the idea is that you have to divide the number or frames by the number of minutes and then by the length of the GOP. |
i edited my last post cos was "too big" but you read before i edit.
i got the "idea" Phil, very clear! Phil wrote: "And the idea is that you have to divide the number or frames by the number of minutes and then by the length of the GOP." 8) |
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I have found the error! 8O
about to the first movie, the correct values are: frames: 258098 Time: 2.52.03 (172.01m) 258098/172,01/60 = 25fps. again: 404.697/(172.01+97.73)/15 = 100,02 now I want to codify the first one in ac3 to 320 and the second in sourround2 to 192. therefore I will have: 172.01x2400 = 403,15 Mb 97,73 x1440 = 137,43 Mb total audio: 540,58 Mb at the end: 4482-200-540.48 = 3741.42/100.02=37,4067 Mb = sample = 38.304 kb :) calculate with vmesquita's Calc is: 37,4142 Mb! :D :D :D :D :D yuuuuuuu when I will have encoded I will make you to know the filesize. byebye |
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Read my post at 3:01 pm :lol: Quote:
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Oops, I came too late... I am glad you were able to figure out. :D 8) Great!
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Vmesquita, as you are there :-) can you :
1/ tell me why when I put for instance "320" in audio bitrate, the sample size is 37 MB (is just an example) and if I put insteed of the bitrate the actual size of the audio file that I have on my disc, the sample size is 36.8 MB ? -> it seems that your calc for audio file size according to the bitrate is wrong. May be a matter of convertion between Bytes and MB ? 2/ In you calc you forgot 384 as audio bitrate ! You have 320 and 448 but nothign beteween the two :-(. Can you change that please ? |
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it is a po difficult to explain, but I will try it.
I had read yours post, only that I did not succeed to understand why Virtualdub had given those values to me: 1st movie - 210.226frames 176m Then I have remembered to me that when I have used dvd2avi for the first time, he seems me to have activated the option "Force Film" as written on the guide of vmesquita. After I have understood that it did not have to activate such option, but I already had annotated those values for the first film. For which the film he came codified in 20fps. in fact 210226/176/60 = 20fps. Therefore when I have written "I have found the error" I mean : to have found from where the values of frame exited and Time of the first film. @Dialhot. Yes, you have found the error! :D thanks. You have much "intuito" (I do not know it like translate) Quote:
byebye |
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The option "force film" is related to NTSC video only. It's purpose is to "convert" 29.70 fps video into 23.976. If you apply this on a regular PAL video (25 fps) you obtain a 20 fps video. :-D Quote:
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