What is Video Compression?, Introduction of Video Compression. Motivation, Working Methodology of Video Compression., Example, Applications, Needs of Video Compression, Advantages & Disadvantages

1. Presented By :
Shreyash Patel

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3. Video compression technology is about reducing and
removing redundant video data so that a digital video file
can be effectively sent over a network and stored on
computer disks. With efficient compression techniques, a
significant reduction in file size can be achieved with little
or no adverse effect on the visual quality or in some case
effected.
For Example: mpeg, mpeg2, mpeg4, mpeg7, etc.
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4.  Compression(encoding) is a reversible conversion of data that contains
fewer bits. This allows a more efficient storage and transmission of the
data. The inverse process is called Decompression(decoding).
 Software and Hardware that can encode and decode are called
decoders. Both combined form a codec and should not be confused
with the terms data container or compression algorithms.
 Fig.1. Compression (Codec) 3

5. Because of next Generation is fully Digitalize and Consumer
video products increasingly rely on video compression
requires Mobiles, Smartphones, Smart T.V., Tablets, C.D.,
D.V.D, Theatres, etc. All Devices having Different Screen Size
to Play any type of Video Files. So, Every Device have a Pixel
limit to Display that type of video so Compression is there.
Actually Algorithms are use here to Encoding & Decoding of
Video and I Also Like Graphic Designing So Video
Compressing is Always There So I Choose This Topic.
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6. The process of compression involves applying an algorithm
to the source video to create a compressed file that is ready
for transmission or storage. To play the compressed file, an
inverse algorithm is applied to produce a video that shows
virtually the same content as the original source video.
The time it takes to compress, send, decompress and display
a file is called latency. The more advanced the compression
algorithm, the higher the latency. For ex. Google Drive.
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7.  A pair of algorithms that works together is called a video codec
(enCODer/DECoder). Video codecs of different standards are normally
not compatible with each other; that is, video content that is
compressed using one standard cannot be decompressed with a
different standard.
 For instance, an MPEG-4 decoder will not work with an H.264 encoder.
This is simply because one algorithm cannot correctly decode the
output from another algorithm but it is possible to implement many
different algorithms in the same software or hardware, which would
then enable multiple formats to coexist.
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8.  Bandwidth Reduction…to Save Memory & Easy To Upload
Internet…
 Even with powerful computer systems (storage, processor
power, network bandwidth), such data amount cause
extreme high computational demands for managing the data.
Fortunately, digital video contains a great deal of
redundancy. Thus it is suitable for compression.
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9.  Fig. 2. Uncompressed
Video Snap 77KB,
Origin quality
 Fig. 3. Compressed Video
Snap has only 26 KB, But
is has worse quality
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10.  Cable TV distribution.
 Interactive communications—videophone, video
conferencing, videotex.
 Digital storage media - CD-ROM, VCD , digital VTR.
 Video-on-demand (ex .Hotstar, VooT).
 Broadcasting (ex. YouTube Live, Facebook Live).
 Video surveillance (ex. Spy Cams)
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Occupies less disk space.
Reading and writing is faster.
File transferring is faster.
The order of bytes is independent.

12.  Compilation need to be done again for
compression.
 Errors may occur while transmitting data.
 The byte/pixel relationship is unknown.
 Need to decompress the previous data.
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13.  As we move into the true era of High
Definition (HD), every device is improving in
quality, both in the quality of the video it can
take and in the resolutions of the devices that
display video.
 Media compression is indispensable even as
storage and streaming capacities increase.
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14. • http://www.careerride.com/view/what-are-the-advantages-and-
disadvantages-of-video-compression-multimedia-compression-
3520.aspx
• http://homepages.inf.ed.ac.uk/rbf/CVonline/LOCAL_COPIES/AV0506/
s0561282.pdf
 Website References
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