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Compression: Crash Course Computer Science #21

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Compression: Crash Course Computer Science #21



Get your first two months of CuriosityStream free by going to http://curiositystream.com/crashcourse and using the promo code “crashcourse”. So last episode we talked about some basic file formats, but what we didn’t talk about is compression. Often files are way too large to be easily stored on hard drives or transferred over the Internet – the solution, unsurprisingly, is to make them smaller. Today, we’re going to talk about lossless compression, which will give you the exact same thing when reassembled, as well as lossy compression, which uses the limitations of human perception to remove less important data. From listening to music and sharing photos, to talking on the phone and even streaming this video right now the ways we use the Internet and our computing devices just wouldn’t be possible without the help of compression.

Pre-order our limited edition Crash Course: Computer Science Floppy Disk Coasters here!
https://store.dftba.com/products/computer-science-coasters

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

Want to know more about Carrie Anne?
https://about.me/carrieannephilbin

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42 Comments

42 Comments

  1. @vinaypratapsingh2608

    November 11, 2024 at 5:33 am

    I was watching SILICON VALLEY then i started wondering what is compression i know the basic idea but how do we implement it.. Then another movement i am here 😂

  2. @SilverScarletSpider

    November 11, 2024 at 5:33 am

    I like competer science sometimes, thanks crash corse

  3. @zxbryc

    November 11, 2024 at 5:33 am

    where's my man lempel and ziv?!

  4. @raivolution

    November 11, 2024 at 5:33 am

    "Hate Mail from Audiophiles"

    Just say you can't hear them.

  5. @faktablad

    November 11, 2024 at 5:33 am

    Celebrity doge appearance

  6. @Richard_is_cool

    November 11, 2024 at 5:33 am

    After the floppy disk episode, I now think that the doge meme was just added for us old people.

  7. @МихаилТелегин-г5щ

    November 11, 2024 at 5:33 am

    Now we can hide a huge amount of absolutely useless data into an extremely small box. What will be the next level of abstraction?!

  8. @THERedstoneBR

    November 11, 2024 at 5:33 am

    9:14
    interessante que quando mostra s 2 fotos uma do lado da outra eles colocaram 2 fotos iguais sem ser um jpeg, ai quando mostraram antes é ALTAMENTE VISÍVEL a diferença, se seus olhos não estão funcionando corretamente, no minimo renomeie a foto que mudou para não colocar as 2 iguais…

  9. @Orokusaki1986

    November 11, 2024 at 5:33 am

    How long until internet speeds are good enough to the point where we only rarely use compression?

  10. @oblivion_2852

    November 11, 2024 at 5:33 am

    Found it weird that you grouped blocks of two different colors before you just make a pallete. There's 3 colors so thats 9 bytes + 16 * 2 bits = 13 bytes. I guess it was to show off the binary tree thing but the example seemed a bit off.

  11. @PoWerLight4444

    November 11, 2024 at 5:33 am

    Thanks for the video !

  12. @lemoncola1164

    November 11, 2024 at 5:33 am

    8:13 do i look like i know what a jpg is, i just want a picture of a got dang hotdog

  13. @FurEngel

    November 11, 2024 at 5:33 am

    It should be noted that the concept of compression was pioneered by Huffman in the 50s and it predates computer science.

  14. @JohnsonAY

    November 11, 2024 at 5:33 am

    So cool! Thanks for this series!

  15. @sackboy1665

    November 11, 2024 at 5:33 am

    C O M M P R E S S

  16. @fukkatsu4

    November 11, 2024 at 5:33 am

    This series is a lot better than my University lectures

  17. @geometrydash8834

    November 11, 2024 at 5:33 am

    nice teeth donkey.

  18. @geometrydash8834

    November 11, 2024 at 5:33 am

    that fringe tho and ur head shape mmmm

  19. @quackhead1895

    November 11, 2024 at 5:33 am

    2:39 hahahahahaahhaha look at bottom right corber hahaha big funmy

  20. @markpaulramos6913

    November 11, 2024 at 5:33 am

    Jin Yang!!!

  21. @odedsol2

    November 11, 2024 at 5:33 am

    9:25
    Help! Help!
    I'm being compressed!!

  22. @Arshar

    November 11, 2024 at 5:33 am

    🤜🤛👍

  23. @amalsal9559

    November 11, 2024 at 5:33 am

    You go girl, excellent.

  24. @Uttar_World

    November 11, 2024 at 5:33 am

    சிறப்பு

  25. @isaacbenmhidi2845

    November 11, 2024 at 5:33 am

    Are all those compressions methods available in our Famous WinRAR ?
    Or are we supposed to use another one that is more specialised ??
    Can you suggest… ?

  26. @vggamer6355

    November 11, 2024 at 5:33 am

    SO CONFUSING!!!!!!!……HOW DOES THIS CHANNEL HAVE 0VER 1MILLION SUBSCRIBERS

  27. @chhussain7024

    November 11, 2024 at 5:33 am

    How we can justify compression?

  28. @luisalves1706

    November 11, 2024 at 5:33 am

    Thank you.

  29. @max500k

    November 11, 2024 at 5:33 am

    Thank you Carrie Anne, for being good at simplifying complicated things

  30. @RandomU5erName

    November 11, 2024 at 5:33 am

    “I’m literally being compressed!”

  31. @trippy_NOSKILL

    November 11, 2024 at 5:33 am

    goofy ahh video

  32. @IsaScience

    November 11, 2024 at 5:33 am

    "I have a killer collection on my retro ipod"

    Dankpods has entered the chat

  33. @eucabrooks

    November 11, 2024 at 5:33 am

    "The answer is compression, which literally squeezes data into a smaller size."
    In my notebook: compression = smaller font 1s and 0s.

  34. @davlatbekkobiljonov911

    November 11, 2024 at 5:33 am

    thank your very much I learned a lot of things watching this episode!

  35. @micahmock3505

    November 11, 2024 at 5:33 am

    My takeaway… it is okay to cut corners when computers are involved. (My elementary school teachers would be feel sick rn.)

  36. @julianbullmagic

    November 11, 2024 at 5:33 am

    this course is great, very clear

  37. @hossamyasser8651

    November 11, 2024 at 5:33 am

    Thank you so much for the information.

  38. @johanvanhuyssteen9217

    November 11, 2024 at 5:33 am

    Brilliant. Thank you!

  39. @tjames22123

    November 11, 2024 at 5:33 am

    Great crash course!!

  40. @sebsplatter914

    November 11, 2024 at 5:33 am

    Damn I love this series so much! This is such a banger baseline for anyone with a passing interest in computers!

  41. @bit_blocky

    November 11, 2024 at 5:33 am

    3:03 This entire series I guessed it was 'don't forget to be amazing' 😂
    Finally, the answer!

  42. @samadel.a765

    November 11, 2024 at 5:33 am

    You just had to add a dad joke at the end 🙂

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Rack Case 12U de 19" modelo 1SKB R12U | Harderback #Rackmount

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November 14, 2024

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Rack Case 12U de 19" modelo 1SKB R12U | Harderback #Rackmount



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3U and 2U 19" Rack Case unboxing + install (Thomann Racks)

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November 14, 2024

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3U and 2U 19" Rack Case unboxing + install (Thomann Racks)



2U 19″ Rack Case and Thomann Rack Case 3U unboxing + PA equipment installation in these Rackmount Cases also know how Flightcases. The DJ Cases/Rack case give you better transportation solution. 19-inch rack is a standardized frame or enclosure for mounting multiple electronic equipment modules. Each module has a front panel that is 19 inches (48.3 cm) wide. The 19-inch dimension includes the edges, or “ears”, that protrude on each side which allow the module to be fastened to the rack frame with screws. Common uses include server, audio, and scientific lab equipment. This 19″ Thomann Rack Cases are very portable Rack Cases and very light.

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What is a Virtual Server?

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November 14, 2024

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What is a Virtual Server?



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In this lightboard video, Bradley Knapp with IBM Cloud, answers these questions and many more as he visually explains what a virtual server is as well as the many benefits it can provide a business.

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48v rack mount Lithium battery best price and design

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48v rack mount Lithium battery best price and design



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SERVIDORES Tower/Rack/Blade | Réntalos en PC RENT

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SERVIDORES Tower/Rack/Blade | Réntalos en PC RENT



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Introducing Acoustic Rack | A Soundproof Cabinet Cost Effective Solution | Netrack India



The AcoustiRACK™ ACTIVE (ARA™) is a soundproof, cabinet providing unprecedented levels of noise reduction up to 30 dB(A) with 8 KW of heat dissipation and dust protection for 19-inch servers and networking equipment. When combined with unique, high-quality acoustic materials, the ARA™ achieves previously unattainable spatial noise reduction over the entire frequency bandwidth of the audible spectrum.

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