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Video Codecs

A brief overview of video compression and codecs
by

Doug Craven

on 27 March 2011

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Transcript of Video Codecs

Factors that Affect Video Size # pixels wide frame size # pixels high video length color depth how many different shades
of colours can be displayed. depends on how many bits
are available to represent
each colour. it gets pretty complicated,
but basically, the more bits
you have, the more colours
you can represent ... with one bit, you could represent monochrome 0 = black
1 = another colour, like white 16 bit 8 bit with four bits,
you can have
16 combinations: 0000 0001 0010 0011
0100 0101 1110 0111
1000 1001 1010 1011
1100 1101 1110 1111 with 16 bits,
you can have
up to 65,536
shades of colour with 32 bits,
you can produce
"truecolour"
with 16,777,216
colours that's more than the human eye can distinguish. frame rate how many frames
per second (fps) http://flashspeaksactionscript.com/dynamically-adjust-the-frame-rate-of-a-flash-animation/ so video files can be huge! COMPRESSION = USING COMPLEX SOFTWARE
TO SHRINK THE
FILE SIZE BUT YOU
CAN'T WATCH
COMPRESSED VIDEO IT'S TOO SQUISHED. THE AH MOMENT! COMPRESS VIDEO

CO MPRESS VIDEO DECOMPRESS VIDEO

DEC OMPRESS VIDEO CO DEC CODEC! A PROGRAM OR DEVICE THAT COMPRESSES AND THEN DECOMPRESSES
VIDEO COMMON CODECS MPEG DIVX windows video what is a flash video (flv) codec? you need to decompress it
first usually your DVD player
or computer do this
without you even
knowing! Once again,
video size is determined by:
video length
frame size
colour depth
frame rate xvid cinepak Why you need to know "Sir, my video won't play. why can i only hear the audio?" so you won't ask: "Sir, why won't my video play here if it plays at home?" "sir, why won't my clips load in premiere?" more info: http://en.wikipedia.org/wiki/Comparison_of_video_codecs advanced knowledge:
a codec is actually an algorithm
Full transcript