Good Encoding... How it can be?

[Bambino]

Hello, guys!
I apologize if my question is offtopic for this forum. I am a beginner in DVD/DivX field. And I would like to get answer on my question. Please answer me how can be the following: not long ago I downloaded the cartoon. It's size is 1 CD (700Mb). The cartoon was encoded with XviD and AC3-5.1 (5 channels, 384Kb/s) is present, but video stream (576x336) was encoded with 1280Kbit/s(!). How?! I tried to encode "A Beautiful Mind" (with AC-3 2 channels) and I can reach just about 680Kbit/s. How such is possible? I note that color is not usual 24bit and 16bit? So this reducing of color bits can affect on bitrate/size? Can I reduce the color mode using VirtualDub? Thank you.

P.S. Probably my English no so good... but I tried... :)

[KpeX]

Your English is ok, but I'd recommend some reading of rules (http://forum.doom9.org/forum-rules.htm), especially 1 and 6 you might want to take note of.

You will gain many answers by reading on this site, your bitrate question doesn't even make much sense to me, it seems you are comparing two different length movies, so it makes no sense to compare their bitrates. Good luck and read up.

[Bambino]

Originally posted by KpeX
Your English is ok,
Thanx... :)

but I'd recommend some reading of rules (http://forum.doom9.org/forum-rules.htm), especially 1 and 6 you might want to take note of.
Certainly I read the rules before posting. But unfortunately I can't phrase the expression for search. That is why I directly hava asked the forum.

You will gain many answers by reading on this site, your bitrate question doesn't even make much sense to me, it seems you are comparing two different length movies, so it makes no sense to compare their bitrates. Good luck and read up.

Hm... You are absolutely right... It is strange that I don't draw attention on movie's length... :( Thanx, KpeX for advice. :)

[Dali Lama]

Bambino,

Xvid encodes in 24 bits, but due to some Windows error it shows up as 16 bits. Also, many AC3 files come right off of the DVD @ 192kbs and is just muxed (added) in with the video. So they are not encoding the AC3 often times.

Also, you wrote the cartoon was encoded at 1280 kbs and you are only getting 680 kbs? 1280 is larger than 680, so just increase the bitrate of your encoding :)

Dali

[Bambino]

Originally posted by Dali Lama
Xvid encodes in 24 bits, but due to some Windows error it shows up as 16 bits. Also, many AC3 files come right off of the DVD @ 192kbs and is just muxed (added) in with the video. So they are not encoding the AC3 often times.

Here it is what abcAVI displays:

Video Stream: XviD MPEG-4 codec 'XVID' <0x44495658>, 576x336, 16 bit, 103970 frm, 23,9760 frm/s, 1281,022 kbit/s

Audio Stream: FAST Multimedia AG DVM (Dolby AC3) <0x2000>, 48000 Hz, 384,000 kbit/s, 5 Channels

Size: 664,61 MB

As you can see bitrate of AC-3 stream is 384K. The size of it about 384Mb (I think...) So the rest of Mb = 664 - 384 = 280Mb(!) I don't understand how 280Mb can be used for video encoding at more then 1000Kbs/s??? As KpeX said earlier maybe the length of the source film is the reason of good bitrate... But I think that 280Mb is not enough for such quality...

Also, you wrote the cartoon was encoded at 1280 kbs and you are only getting 680 kbs? 1280 is larger than 680, so just increase the bitrate of your encoding :)

Thank you... :-) And I get the result file about 1,2Gb... :-) But I wrote about size of 1 CD. See the film's parameters above.

[Dali Lama]

Bambino,

Is that cartoon just one episode or a full-length movie? It might be 20-30 minutes long and therefore have a high bitrate. 200 megabytes for one episode is more than enough in my opinion.

Also, A Beautiful Mind is a rather long movie right? So putting it on 1 CD is naturally going to give lower quality because it must use a low bitrate.

Good luck,

Dali

[Bambino]

Is that cartoon just one episode or a full-length movie? It might be 20-30 minutes long and therefore have a high bitrate. 200 megabytes for one episode is more than enough in my opinion.

The cartoon (Jungle Book 2) is full-length. Length is 72 min 16,42 s

[manono]

Hi-

Now you've finally provided some useful information. The audio will be around 199MB. With the overhead included call it 201MB. That leaves roughly 464MB for the video with a video bitrate of roughly 898. That 1280 figure you gave must have been for audio and video together. Either that or that program you used is simply wrong. If you want a good bitrate calculator, use Gordian Knot.

And I wonder why the guy that encoded the cartoon didn't fill the CD. Maybe he just didn't know what he was doing.

Certainly I read the rules before posting. But unfortunately I can't phrase the expression for search.

KpeX was talking about the search rule, and also the rule about discussing illegally downloaded material. We don't do that here (I say after just doing that very thing). :) Anyway, please be more careful in the future.

[Bambino]

Originally posted by manono
Now you've finally provided some useful information. The audio will be around 199MB.

Why did you decide it? I wrote about DD sound with 5 channels with 384K inside DivX. How it's size may be about 201Mb? I think it's size is about 380Mb.

With the overhead included call it 201MB. That leaves roughly 464MB for the video with a video bitrate of roughly 898. That 1280 figure you gave must have been for audio and video together.

If size of sound is 380Mb than video size will be 281Mb.

If you want a good bitrate calculator, use Gordian Knot.

I'm using just the Gordian Knot.
Either that or that program you used is simply wrong.

I'm using an abcAVI. As I remember doom9 has a link to it.

And I wonder why the guy that encoded the cartoon didn't fill the CD. Maybe he just didn't know what he was doing.

I know what I'm doing... :)

KpeX was talking about the search rule, and also the rule about discussing illegally downloaded material. We don't do that here (I say after just doing that very thing). :) Anyway, please be more careful in the future.

But I didn't discuss the "illegally downloaded material" (by the way in our country it is "legally"... I'm seriously... there is a site where are about 700 DivX'), I just discussed technical questions. And anyway I will be "more carefull in the future"... :) My appologize to moderator.

P.S. By the way I could download the file really legally (for example from official DivX site)...

[manono]

Hi-

If size of sound is 380Mb...

It isn't. Prove it for yourself. Extract the audio and see. Open the movie in Nandub. Set Video to Direct Stream Copy. Then go File-Save WAV and rename it as .ac3 when done.

If you want a better program to get the video bitrate, get GSpot (http://www.doom9.org/Soft21/Editing/gspot22.zip).

But I didn't discuss the "illegally downloaded material"

I don't know about that, unless I misunderstood something. In the beginning you said you had downloaded a cartoon. Later you said it was Jungle Book 2 (http://us.imdb.com/Title?0283426). That's a copywrited Disney cartoon. Therefore it's illegal to download. Even in your country.

[Acaila]

Why did you decide it? I wrote about DD sound with 5 channels with 384K inside DivX. How it's size may be about 201Mb? I think it's size is about 380Mb.If the birate is 384 kb/s and the duration is 72 mins 16 secs, then you can do the following calculation to see what the audio size is:
(384 * (72*60+16))/8 = 208129 kB = 203 MB

Same goes for the 1280 kb/s you mentioned in your first post:
(1280 * (72*60+16))/8 = 693760 kB = 677 MB

The size is dependant on the duration of the audio/video, which is why when you compare the bitrate with another movie like Beautiful Mind there's no connection whatsoever.
As a side-note Beautiful Mind is not easy to encode in high quality mostly because it's a 2 hour movie that also has a 1:85 Aspect Ratio. But that's another story altogether :).