http://www.compressionist.net Tue, 21 Aug 2012 20:10:37 +0000 en-US hourly 1 http://wordpress.org/?v=3.4.1 What is good quality? http://www.compressionist.net/2011/10/what-is-good-quality/ http://www.compressionist.net/2011/10/what-is-good-quality/#comments Thu, 13 Oct 2011 20:25:52 +0000 Kennet Eriksson http://compressionist.net/?p=478 When motion is smooth
When there is no artifacts
When the gamma curve looks as expected
When the viewer/customer can open the file
When colors are “correct”
When Aspect ratio is correct
When playback works!
]]> http://www.compressionist.net/2011/10/what-is-good-quality/feed/ 0 File Format vs Codec http://www.compressionist.net/2011/10/file-format-vs-codec/ http://www.compressionist.net/2011/10/file-format-vs-codec/#comments Thu, 13 Oct 2011 20:16:58 +0000 Kennet Eriksson http://compressionist.net/?p=472 File Formats

QuickTime .mov
MPEG PS .mpg
MPEG TS .ts
MPEG-4 .mp4
Flash .flv
WebM .webm
Window Media 9 .wmv


Video Codecs

Animation
Apple ProRes 422
Avid DNxHD
DV – PAL
H264
HDV
MPEG IMX
REDCODE
Uncompressed 10-bit 4:2:2
XDCam EX 720p50

Example of some codecs supported by QuickTime file format

]]> http://www.compressionist.net/2011/10/file-format-vs-codec/feed/ 0 Advanced Knowledge http://www.compressionist.net/2011/10/advanced-knowledge/ http://www.compressionist.net/2011/10/advanced-knowledge/#comments Thu, 13 Oct 2011 20:14:04 +0000 Kennet Eriksson http://compressionist.net/?p=465 Color Space: RGB, YCbCr, YUV

Ex. 4:4:4, 4:2:2, 4:2:0




Video Bit Rate: Data Bits Per Second

Ex. 1920x1080x24bitx25fps=1244Mbps=156MB/s

Ex. 1920x1080x24bitx30fps=1493Mbps=187MB/s

]]> http://www.compressionist.net/2011/10/advanced-knowledge/feed/ 0 Basic knowledge http://www.compressionist.net/2011/10/basic-knowledge/ http://www.compressionist.net/2011/10/basic-knowledge/#comments Thu, 13 Oct 2011 19:55:50 +0000 Kennet Eriksson http://compressionist.net/?p=455 Screen Size = Picture Width x Picture Hight

Example 1920px*1080px




Frame Rate = Frames Per Second

Example 24fps, 25fps, 29.97fps

]]> http://www.compressionist.net/2011/10/basic-knowledge/feed/ 0 Screen Sizes http://www.compressionist.net/2011/10/screen-sizes/ http://www.compressionist.net/2011/10/screen-sizes/#comments Thu, 13 Oct 2011 19:44:59 +0000 Kennet Eriksson http://compressionist.net/?p=444 Screen Size = Picture width x Picture Hight

Example 1920*1080px

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