Re: Itunes, bitrate, and other questions...
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Joined: Feb 2009
Posts: 3,466
connoisseur
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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
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Re: Itunes, bitrate, and other questions...
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Joined: Apr 2003
Posts: 16,441
shareholder in the making
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shareholder in the making
Joined: Apr 2003
Posts: 16,441 |
uhh, it's a green waveform?
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Re: Itunes, bitrate, and other questions...
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Joined: Feb 2009
Posts: 3,466
connoisseur
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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
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Re: Itunes, bitrate, and other questions...
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Joined: Apr 2003
Posts: 16,441
shareholder in the making
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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...
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Re: Itunes, bitrate, and other questions...
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Joined: Feb 2009
Posts: 3,466
connoisseur
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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
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Re: Itunes, bitrate, and other questions...
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Joined: Feb 2006
Posts: 6,471
axiomite
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axiomite
Joined: Feb 2006
Posts: 6,471 |
Watch out, or Tom will banish you to the math thread.
Bears, beets, Battlestar Galactica.
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Re: Itunes, bitrate, and other questions...
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Joined: Feb 2009
Posts: 3,466
connoisseur
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connoisseur
Joined: Feb 2009
Posts: 3,466 |
Pioneer PDP-5020FD, Marantz SR6011 Axiom M5HP, VP160HP, QS8 Sony PS4, surround backs -Chris
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Re: Itunes, bitrate, and other questions...
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Joined: Jan 2004
Posts: 13,840 Likes: 13
shareholder in the making
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OP
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
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Re: Itunes, bitrate, and other questions...
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Joined: Feb 2009
Posts: 3,466
connoisseur
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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
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Re: Itunes, bitrate, and other questions...
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Joined: Jul 2006
Posts: 12,077 Likes: 7
Founder, Axiom Upgrade Club shareholder in the making
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Founder, Axiom Upgrade Club shareholder in the making
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.
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