Previous Thread
Next Thread
Print Thread
Rate Thread
Page 3 of 7 1 2 3 4 5 6 7
Re: Itunes, bitrate, and other questions...
Ken.C #284291 12/29/09 05:37 PM
Joined: Feb 2009
Posts: 3,466
connoisseur
Offline
connoisseur
Joined: Feb 2009
Posts: 3,466
Bonus points to anyone who can explain what FFmpeg logo means. (Yes it's on-topic to my off-topic topic.)


Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris
Re: Itunes, bitrate, and other questions...
ClubNeon #284295 12/29/09 05:43 PM
Joined: Apr 2003
Posts: 16,441
shareholder in the making
Offline
shareholder in the making
Joined: Apr 2003
Posts: 16,441
uhh, it's a green waveform?

Re: Itunes, bitrate, and other questions...
pmbuko #284299 12/29/09 05:46 PM
Joined: Feb 2009
Posts: 3,466
connoisseur
Offline
connoisseur
Joined: Feb 2009
Posts: 3,466
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.


Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris
Re: Itunes, bitrate, and other questions...
ClubNeon #284303 12/29/09 05:49 PM
Joined: Apr 2003
Posts: 16,441
shareholder in the making
Offline
shareholder in the making
Joined: Apr 2003
Posts: 16,441
And here I was thinking it was rotated 45° so it would fit in a square better...

Re: Itunes, bitrate, and other questions...
pmbuko #284306 12/29/09 05:56 PM
Joined: Feb 2009
Posts: 3,466
connoisseur
Offline
connoisseur
Joined: Feb 2009
Posts: 3,466
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!


Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris
Re: Itunes, bitrate, and other questions...
ClubNeon #284308 12/29/09 05:58 PM
Joined: Feb 2006
Posts: 6,471
axiomite
Offline
axiomite
Joined: Feb 2006
Posts: 6,471
Watch out, or Tom will banish you to the math thread.


Bears, beets, Battlestar Galactica.
Re: Itunes, bitrate, and other questions...
medic8r #284309 12/29/09 05:59 PM
Joined: Feb 2009
Posts: 3,466
connoisseur
Offline
connoisseur
Joined: Feb 2009
Posts: 3,466
There's a Math thread?!


Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris
Re: Itunes, bitrate, and other questions...
medic8r #284311 12/29/09 05:59 PM
Joined: Jan 2004
Posts: 13,840
Likes: 13
shareholder in the making
OP Offline
shareholder in the making
Joined: Jan 2004
Posts: 13,840
Likes: 13
Would you guys stop copying/pasting Google search results to make you sound smart. lol


M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85


Re: Itunes, bitrate, and other questions...
SirQuack #284314 12/29/09 06:02 PM
Joined: Feb 2009
Posts: 3,466
connoisseur
Offline
connoisseur
Joined: Feb 2009
Posts: 3,466
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. \:\)

Last edited by ClubNeon; 12/29/09 06:04 PM. Reason: Correct the year, 1992 not 1991

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris
Re: Itunes, bitrate, and other questions...
ClubNeon #284316 12/29/09 06:04 PM
Joined: Jul 2006
Posts: 12,077
Likes: 7
C
CV Offline
Founder, Axiom Upgrade Club
shareholder in the making
Offline
Founder, Axiom Upgrade Club
shareholder in the making
C
Joined: Jul 2006
Posts: 12,077
Likes: 7
Now if only you'd share the fact that you're bbigwyres or however you spell his name.

Page 3 of 7 1 2 3 4 5 6 7

Moderated by  alan, Amie, Andrew, axiomadmin, Brent, Debbie, Ian, Jc 

Link Copied to Clipboard

Need Help Graphic

Forum Statistics
Forums16
Topics24,940
Posts442,457
Members15,616
Most Online2,082
Jan 22nd, 2020
Top Posters
Ken.C 18,044
pmbuko 16,441
SirQuack 13,840
CV 12,077
MarkSJohnson 11,458
Who's Online Now
0 members (), 585 guests, and 1 robot.
Key: Admin, Global Mod, Mod
Newsletter Signup
Powered by UBB.threads™ PHP Forum Software 7.7.4