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#284291 - 12/29/09 12:37 PM Re: Itunes, bitrate, and other questions... [Re: Ken.C]
ClubNeon Offline
connoisseur

Registered: 02/06/09
Posts: 3453
Loc: Western Maryland, USA
Bonus points to anyone who can explain what FFmpeg logo means. (Yes it's on-topic to my off-topic topic.)
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#284295 - 12/29/09 12:43 PM Re: Itunes, bitrate, and other questions... [Re: ClubNeon]
pmbuko Offline
shareholder in the making

Registered: 04/02/03
Posts: 16349
Loc: Leesburg, Virginia
uhh, it's a green waveform?
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#284299 - 12/29/09 12:46 PM Re: Itunes, bitrate, and other questions... [Re: pmbuko]
ClubNeon Offline
connoisseur

Registered: 02/06/09
Posts: 3453
Loc: Western Maryland, USA
No waveform function can have two different Y values for one X. So it's not a waveform.

Another hint: It has to do more with pictures than audio, but is still related.
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#284303 - 12/29/09 12:49 PM Re: Itunes, bitrate, and other questions... [Re: ClubNeon]
pmbuko Offline
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Registered: 04/02/03
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Loc: Leesburg, Virginia
And here I was thinking it was rotated 45° so it would fit in a square better...
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#284306 - 12/29/09 12:56 PM Re: Itunes, bitrate, and other questions... [Re: pmbuko]
ClubNeon Offline
connoisseur

Registered: 02/06/09
Posts: 3453
Loc: Western Maryland, USA
Fitting in a square; that's actually pretty insightful.

I'll give.

The Fourier transform can only be applied to 1 dimensional data. The change in amplitude of audio samples over time is what is fed into it for MP3s. But pictures are 2 dimensional. So what JPEG did was to break each picture into squares, 8x8 being the most common. Then they needed a standardized way to linearize the pixels in that block. Keep in mind the Fourier transform works best when the next sample fed into it is closely related to the previous. So what's the path through an 8x8 grid which most closely relates each next sample to the previous.

There's your answer!
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#284308 - 12/29/09 12:58 PM Re: Itunes, bitrate, and other questions... [Re: ClubNeon]
medic8r Offline
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Registered: 02/05/06
Posts: 6433
Loc: Fredericksburg, Virginia
Watch out, or Tom will banish you to the math thread.
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#284309 - 12/29/09 12:59 PM Re: Itunes, bitrate, and other questions... [Re: medic8r]
ClubNeon Offline
connoisseur

Registered: 02/06/09
Posts: 3453
Loc: Western Maryland, USA
There's a Math thread?!
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Pioneer VSX-1018AH-K, PDP-5020FD, DV-79AVi
Axiom M22s, VP150, QS8s
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-Chris

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#284311 - 12/29/09 12:59 PM Re: Itunes, bitrate, and other questions... [Re: medic8r]
SirQuack Offline
shareholder in the making

Registered: 01/29/04
Posts: 13357
Loc: Iowa
Would you guys stop copying/pasting Google search results to make you sound smart. lol
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#284314 - 12/29/09 01:02 PM Re: Itunes, bitrate, and other questions... [Re: SirQuack]
ClubNeon Offline
connoisseur

Registered: 02/06/09
Posts: 3453
Loc: Western Maryland, USA
I've known the fact about the JPEG/MPEG macroblock encoding path since 1992 (got a copy of Micrografx Picture Publisher which included this new JPEG image format and I had to know how it worked). When I saw the FFmpeg logo I was so overjoyed that I got it. Been wanting to share that bit of info with someone for a couple years now. \:\)


Edited by ClubNeon (12/29/09 01:04 PM)
Edit Reason: Correct the year, 1992 not 1991
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Pioneer VSX-1018AH-K, PDP-5020FD, DV-79AVi
Axiom M22s, VP150, QS8s
Sony PS3, surround backs
-Chris

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#284316 - 12/29/09 01:04 PM Re: Itunes, bitrate, and other questions... [Re: ClubNeon]
CV Offline
Founder, Axiom Upgrade Club
shareholder in the making

Registered: 07/20/06
Posts: 11460
Loc: Richland, WA, USA
Now if only you'd share the fact that you're bbigwyres or however you spell his name.

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