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Codec

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data, corrupt an entire computer system or to keep spreading the malware. One of the previous most used ways to spread malware was fake AV pages and with the rise of codec technology, both have been used in combination to take advantage of online users. This combination allows fake codecs to be automatically downloaded to a device through a website linked in a pop-up ad, virus/codec alerts or articles as well.
349:(AVI) is sometimes erroneously described as a codec, but AVI is actually a container format, while a codec is a software or hardware tool that encodes or decodes audio or video into or from some audio or video format. Audio and video encoded with many codecs might be put into an AVI container, although AVI is not an 338:
codecs allow more users, but they also have more distortion. Beyond the initial increase in distortion, lower bit rate codecs also achieve their lower bit rates by using more complex algorithms that make certain assumptions, such as those about the media and the packet loss rate. Other codecs may not
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into whatever data is being compressed and uses it as a disguise. This disguise appears as a codec download through a pop-up alert or ad. When a user goes to click or download that codec, the malware is then installed on the computer. Once a fake codec is installed it is often used to access private
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Many popular codecs are lossy. They reduce quality in order to maximize compression. Often, this type of compression is virtually indistinguishable from the original uncompressed sound or images, depending on the codec and the settings used. The most widely used lossy data compression technique in
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There are thousands of audio and video codecs, ranging in cost from free to hundreds of dollars or more. This variety of codecs can create compatibility and obsolescence issues. The impact is lessened for older formats, for which free or nearly-free codecs have existed for a long time. The older
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Lossless codecs are often used for archiving data in compressed form while retaining all information present in the original stream. If preserving the original quality of the stream is more important than eliminating the correspondingly larger data sizes, lossless codecs are preferred. This is
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converts analog audio signals into digital signals for transmission or encodes them for storage. A receiving device converts the digital signals back to analog form using an audio decoder for playback. An example of this is the codecs used in the sound cards of personal computers. A
308:(44.1 kHz, 16-bit stereo, as represented on an audio CD or in a .wav or .aiff file) has long been a standard across multiple platforms, but its transmission over networks is slow and expensive compared with more modern compressed formats, such as 191:
In addition to encoding a signal, a codec may also compress the data to reduce transmission bandwidth or storage space. Compression codecs are classified primarily into
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codec) of a sports event needs to encode motion well but not necessarily exact colors, while a video of an art exhibit needs to encode color and surface texture well.
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make those same assumptions. When a user with a low bitrate codec talks to a user with another codec, additional distortion is introduced by each
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formats are often ill-suited to modern applications, however, such as playback on small portable devices. For example, raw uncompressed
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between source encoding and playback. In contrast, audio codecs for recording or broadcasting can use high-latency
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above 5.0 – all sound artifacts will be beyond threshold of human perception with corresponding perception margin
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is a device that acts as both an encoder and a decoder on a signal or data stream, and hence is a type of codec.
1816: 1436: 1230: 1018: 133:(PCM). Later, the name was also applied to software for converting between digital signal formats, including 1913: 949: 1578: 1903: 1806: 1348: 906: 720: 896: 891: 1838: 1765: 1603: 1583: 1527: 1185: 976: 779: 507: 487: 390: 328: 1939: 1848: 1789: 1715: 1563: 1153: 1148: 1003: 846: 497: 216: 158: 1853: 1426: 1220: 921: 633: 297: 1794: 1165: 1052: 1008: 821: 804: 794: 477: 358: 124: 120: 95:
form, and the decoder function reverses the encoding for playback or editing. Codecs are used in
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In the mid-20th century, a codec was a device that coded analog signals into digital form using
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A coder or encoder encodes a data stream or a signal for transmission or storage, possibly in
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audio. Smaller data sets ease the strain on relatively expensive storage sub-systems such as
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This article is about encoding and decoding a digital data stream. For other uses, see
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are used when an online user takes a type of codec and installs viruses and other
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especially true if the data is to undergo further processing (for example,
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Two principal techniques are used in codecs, pulse-code modulation and
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Device or software for encoding or decoding a digital data stream
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are examples of container formats that are ISO standardized.
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techniques to achieve higher fidelity at a lower bit rate.
228: 220: 672: 1047: 1013: 386: 354: 256: 232: 673:"Audio quality of aac vs. mp3 vs. wma vs. ogg encoders" 292:Audio codecs for cell phones need to have very low 161:(IrDA) protocol, an endec may be used between the 1931: 609:"Codec – Definition of Codec by Merriam-Webster" 154:accomplishes the same task for video signals. 728: 219:(DCT), used in compression standards such as 742: 586:. Ubuntu Documentation Team. Archived from 735: 721: 584:"Ubuntu Documentation - What is a codec?" 443:Learn how and when to remove this message 659:"IrDA SIR ENDEC functional description" 14: 1932: 697:"Fake Video Codecs Still Going Strong" 556: 539:from the original on September 6, 2010 716: 631: 493:Comparison of video container formats 414:This section may contain information 400: 632:Rouse, Margaret (24 October 2016). 24: 483:Comparison of audio coding formats 125:Audio coding format § History 121:Video coding format § History 25: 1961: 72:In electronic communications, an 1909: 1908: 1899: 1898: 405: 117:Image compression § History 266: 689: 665: 651: 625: 601: 576: 550: 521: 172: 13: 1: 514: 7: 561:. About.com. Archived from 470: 140: 10: 1966: 1790:Compressed data structures 1112:RLE + BWT + MTF + Huffman 780:Asymmetric numeral systems 508:List of open-source codecs 488:Comparison of video codecs 396: 391:ISO base media file format 319:data streams contain both 270: 176: 114: 110: 29: 1950:Digital signal processing 1894: 1878: 1862: 1780: 1705: 1637: 1628: 1551: 1485: 1476: 1377: 1294: 1285: 1201: 1149:Discrete cosine transform 1139: 1130: 1079:LZ77 + Huffman + context 1032: 942: 872: 760: 751: 498:Digital signal processing 420:to the article's subject. 217:discrete cosine transform 159:Infrared Data Association 1854:Smallest grammar problem 1795:Compressed suffix array 1344:Nyquist–Shannon theorem 478:Audio signal processing 557:Siegchrist, Gretchen. 347:Audio Video Interleave 157:When implementing the 32:Codec (disambiguation) 1824:Kolmogorov complexity 1692:Video characteristics 1069:LZ77 + Huffman + ANS 418:important or relevant 379:MPEG transport stream 271:Further information: 177:Further information: 131:pulse-code modulation 115:Further information: 1914:Compression software 1508:Compression artifact 1464:Psychoacoustic model 590:on February 19, 2012 425:improve this section 249:write-once-read-many 1904:Compression formats 1543:Texture compression 1538:Standard test image 1354:Silence compression 559:"About.com - Codec" 383:MPEG program stream 241:non-volatile memory 187:Audio coding format 183:Video coding format 1812:Information theory 1667:Display resolution 1493:Chroma subsampling 882:Byte pair encoding 827:Shannon–Fano–Elias 1927: 1926: 1776: 1775: 1726:Deblocking filter 1624: 1623: 1472: 1471: 1281: 1280: 1126: 1125: 634:"Encoder/Decoder" 453: 452: 445: 375:DivX Media Format 298:audio compression 179:Image compression 97:videoconferencing 16:(Redirected from 1957: 1940:Data compression 1912: 1911: 1902: 1901: 1731:Lapped transform 1635: 1634: 1513:Image resolution 1498:Coding tree unit 1483: 1482: 1292: 1291: 1137: 1136: 758: 757: 744:Data 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549: 529:"Using codecs" 519: 518: 516: 513: 511: 510: 505: 503:List of codecs 500: 495: 490: 485: 480: 474: 472: 469: 451: 450: 413: 411: 404: 398: 395: 268: 265: 174: 171: 167:optoelectronic 142: 139: 112: 109: 107:applications. 26: 9: 6: 4: 3: 2: 1962: 1951: 1948: 1946: 1943: 1941: 1938: 1937: 1935: 1919: 1915: 1907: 1905: 1897: 1896: 1893: 1887: 1884: 1883: 1881: 1877: 1871: 1868: 1867: 1865: 1861: 1855: 1852: 1850: 1847: 1845: 1842: 1840: 1837: 1835: 1832: 1830: 1827: 1825: 1822: 1818: 1815: 1814: 1813: 1810: 1808: 1805: 1801: 1798: 1796: 1793: 1792: 1791: 1788: 1787: 1785: 1783: 1779: 1767: 1764: 1762: 1759: 1758: 1757: 1754: 1750: 1747: 1745: 1742: 1740: 1737: 1736: 1734: 1732: 1729: 1727: 1724: 1722: 1719: 1717: 1714: 1713: 1711: 1708: 1704: 1698: 1697:Video quality 1695: 1693: 1690: 1688: 1685: 1683: 1680: 1678: 1675: 1673: 1670: 1668: 1665: 1661: 1658: 1656: 1653: 1651: 1648: 1647: 1646: 1643: 1642: 1640: 1636: 1633: 1631: 1627: 1615: 1612: 1610: 1607: 1605: 1602: 1600: 1597: 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SoundExpert 674: 668: 660: 654: 639: 635: 628: 614: 610: 604: 589: 585: 579: 564: 560: 553: 538: 534: 530: 524: 520: 509: 506: 504: 501: 499: 496: 494: 491: 489: 486: 484: 481: 479: 476: 475: 468: 465: 461: 447: 444: 436: 426: 421: 419: 412: 403: 402: 394: 392: 388: 384: 380: 376: 372: 368: 364: 360: 356: 352: 348: 344: 342: 337: 332: 330: 326: 322: 318: 313: 311: 307: 301: 299: 295: 290: 288: 284: 278: 274: 264: 262: 258: 254: 250: 247:, as well as 246: 242: 238: 234: 230: 226: 222: 218: 214: 213:digital media 208: 206: 200: 198: 194: 188: 184: 180: 170: 168: 164: 160: 155: 153: 148: 138: 136: 132: 126: 122: 118: 108: 106: 105:video editing 102: 98: 94: 89: 87: 83: 79: 75: 70: 68: 67:coder/decoder 64: 60: 56: 52: 48: 44: 40: 33: 19: 1917: 1870:Hutter Prize 1834:Quantization 1739:Compensation 1533:Quantization 1256:Compensation 822:Shannon–Fano 762:Entropy type 700:. Retrieved 691: 683: 677:. Retrieved 667: 653: 641:. Retrieved 637: 627: 616:. Retrieved 612: 603: 592:. Retrieved 588:the original 578: 567:. Retrieved 563:the original 552: 541:. Retrieved 523: 455: 454: 439: 433:January 2022 430: 423:Please help 415: 351:ISO standard 345: 333: 314: 302: 291: 280: 267:Media codecs 261:Blu-ray Disc 209: 201: 190: 156: 144: 128: 90: 85: 77: 73: 71: 66: 58: 38: 36: 1829:Prefix code 1682:Frame types 1503:Color space 1329:Convolution 1059:LZ77 + ANS 970:Incremental 943:Other types 862:Levenshtein 643:27 December 458:Fake codecs 341:transcoding 277:Audio codec 273:Video codec 231:video, and 195:codecs and 173:Compression 152:video codec 147:audio codec 137:functions. 82:portmanteau 63:portmanteau 51:data stream 1934:Categories 1886:Mark Adler 1844:Redundancy 1761:Daubechies 1744:Estimation 1677:Frame rate 1599:Daubechies 1559:Chain code 1518:Macroblock 1324:Companding 1261:Estimation 1181:Daubechies 887:Lempel–Ziv 847:Exp-Golomb 775:Arithmetic 702:2022-01-09 679:2010-07-25 638:Techopedia 618:2019-01-15 594:2009-12-21 569:2009-12-21 543:2009-12-21 515:References 317:multimedia 135:companding 1863:Community 1687:Interlace 1073:Zstandard 852:Fibonacci 842:Universal 800:Canonical 533:Microsoft 367:RealMedia 363:QuickTime 312:and MP3. 306:PCM audio 245:hard disk 169:systems. 93:encrypted 1849:Symmetry 1817:Timeline 1800:FM-index 1645:Bit rate 1638:Concepts 1486:Concepts 1349:Sampling 1302:Bit rate 1295:Concepts 997:Sequitur 832:Tunstall 805:Modified 795:Adaptive 753:Lossless 537:Archived 471:See also 371:Matroska 223:images, 199:codecs. 197:lossless 165:and the 141:Examples 1807:Entropy 1756:Wavelet 1735:Motion 1594:Wavelet 1574:Fractal 1569:Deflate 1552:Methods 1339:Latency 1252:Motion 1176:Wavelet 1093:LHA/LZH 1043:Deflate 992:Re-Pair 987:Grammar 817:Shannon 790:Huffman 746:methods 464:malware 397:Malware 336:bitrate 294:latency 205:editing 111:History 47:decodes 1945:Codecs 1918:codecs 1879:People 1782:Theory 1749:Vector 1266:Vector 1083:Brotli 1033:Hybrid 932:Snappy 785:Golomb 389:, and 373:, and 334:Lower 259:, and 253:CD-ROM 185:, and 123:, and 103:, and 55:signal 18:Codecs 1709:parts 1707:Codec 1672:Frame 1630:Video 1614:SPIHT 1523:Pixel 1478:Image 1432:ACELP 1403:ADPCM 1393:ÎĽ-law 1388:A-law 1381:parts 1379:Codec 1287:Audio 1226:ACELP 1214:ADPCM 1191:SPIHT 1132:Lossy 1116:bzip2 1107:LZHAM 1063:LZFSE 965:Delta 857:Gamma 837:Unary 812:Range 325:video 321:audio 315:Many 225:H.26x 193:lossy 80:is a 78:Endec 74:endec 61:is a 59:Codec 39:codec 1721:DPCM 1528:PSNR 1459:MDCT 1452:WLPC 1437:CELP 1398:DPCM 1246:WLPC 1231:CELP 1209:DPCM 1159:MDCT 1103:LZMA 1004:LDCT 982:DPCM 927:LZWL 917:LZSS 912:LZRW 902:LZJB 645:2023 416:not 323:and 310:Opus 275:and 243:and 235:and 229:MPEG 227:and 221:JPEG 163:UART 1766:DWT 1716:DCT 1660:VBR 1655:CBR 1650:ABR 1609:EZW 1604:DWT 1589:RLE 1579:KLT 1564:DCT 1447:LSP 1442:LAR 1427:LPC 1420:FFT 1317:VBR 1312:CBR 1307:ABR 1241:LSP 1236:LAR 1221:LPC 1186:DWT 1171:FFT 1166:DST 1154:DCT 1053:LZS 1048:LZX 1024:RLE 1019:PPM 1014:PAQ 1009:MTF 977:DMC 955:CTW 950:BWT 922:LZW 907:LZO 897:LZ4 892:842 387:MP4 359:ASF 355:Ogg 257:DVD 237:AAC 233:MP3 145:An 88:. 84:of 65:of 53:or 1936:: 1584:LP 1415:FT 1408:DM 960:CM 682:. 636:. 611:. 535:. 531:. 385:, 381:, 377:. 369:, 365:, 361:, 357:, 343:. 331:. 287:DV 255:, 181:, 119:, 99:, 69:. 57:. 49:a 37:A 1920:) 1916:( 736:e 729:t 722:v 705:. 661:. 647:. 621:. 597:. 572:. 546:. 446:) 440:( 435:) 431:( 427:. 34:. 20:)

Index

Codecs
Codec (disambiguation)
computer program
decodes
data stream
signal
portmanteau
portmanteau
encrypted
videoconferencing
streaming media
video editing
Image compression § History
Video coding format § History
Audio coding format § History
pulse-code modulation
companding
audio codec
video codec
Infrared Data Association
UART
optoelectronic
Image compression
Video coding format
Audio coding format
lossy
lossless
editing
digital media
discrete cosine transform

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