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Matroska is a container, not a video codec. One MKV can hold video, multiple audio tracks, subtitles, chapters, tags, and attachments.",[705,706,707],"sup",{},[697,708,714],{"href":709,"ariaDescribedBy":710,"dataFootnoteRef":712,"id":713},"#user-content-fn-1",[711],"footnote-label","","user-content-fnref-1","1",[705,716,717],{},[697,718,722],{"href":719,"ariaDescribedBy":720,"dataFootnoteRef":712,"id":721},"#user-content-fn-2",[711],"user-content-fnref-2","2",[690,724,725],{},"That flexibility is useful for movies, multilingual releases, recorded presentations, and preservation masters. It also means the extension alone cannot tell you whether a particular device can play the file. A player must support the Matroska container and every codec needed by its tracks.",[727,728,729,731,732,735,736,740,741,747,755,756,759],"note",{},[685,730,687],{}," is now a deprecated alias. RFC 9559 registered ",[685,733,734],{},"video\u002Fmatroska"," as the standard name in 2024, with ",[697,737,738],{"href":699},[685,739,702],{}," as its extension and no required or optional parameters.",[705,742,743],{},[697,744,714],{"href":709,"ariaDescribedBy":745,"dataFootnoteRef":712,"id":746},[711],"user-content-fnref-1-2",[705,748,749],{},[697,750,754],{"href":751,"ariaDescribedBy":752,"dataFootnoteRef":712,"id":753},"#user-content-fn-3",[711],"user-content-fnref-3","3"," Existing software and collections still use the older ",[685,757,758],{},"x-"," spelling, so compatible applications often recognize both.",[680,761,763],{"id":762},"how-to-identify-an-mkv-file","How to identify an MKV file",[690,765,766,767,770,771,774,775,781],{},"Matroska is built on EBML, the Extensible Binary Meta Language. A file starts with an EBML header whose element ID is ",[685,768,769],{},"1A 45 DF A3",", but that byte sequence is not unique to Matroska. Reliable identification also checks that the header's document type is ",[685,772,773],{},"matroska"," and validates the following structure.",[705,776,777],{},[697,778,722],{"href":719,"ariaDescribedBy":779,"dataFootnoteRef":712,"id":780},[711],"user-content-fnref-2-2",[705,782,783],{},[697,784,788],{"href":785,"ariaDescribedBy":786,"dataFootnoteRef":712,"id":787},"#user-content-fn-4",[711],"user-content-fnref-4","4",[690,790,791,792,794,795,801,802,806],{},"The IANA registration therefore lists no standalone magic number for ",[685,793,734],{},".",[705,796,797],{},[697,798,714],{"href":709,"ariaDescribedBy":799,"dataFootnoteRef":712,"id":800},[711],"user-content-fnref-1-3"," Renaming another video to ",[697,803,804],{"href":699},[685,805,702],{}," changes only its filename. It does not create a Matroska container.",[690,808,809],{},"Common Matroska extensions describe different kinds of content:",[811,812,813,829],"table",{},[814,815,816],"thead",{},[817,818,819,823,826],"tr",{},[820,821,822],"th",{},"Extension",[820,824,825],{},"Typical content",[820,827,828],{},"Registered MIME type",[830,831,832,848,863,878],"tbody",{},[817,833,834,841,844],{},[835,836,837],"td",{},[697,838,839],{"href":699},[685,840,702],{},[835,842,843],{},"Video, often with audio and subtitles",[835,845,846],{},[685,847,734],{},[817,849,850,855,858],{},[835,851,852],{},[685,853,854],{},".mka",[835,856,857],{},"Audio-only Matroska",[835,859,860],{},[685,861,862],{},"audio\u002Fmatroska",[817,864,865,870,873],{},[835,866,867],{},[685,868,869],{},".mk3d",[835,871,872],{},"Stereoscopic video",[835,874,875],{},[685,876,877],{},"video\u002Fmatroska-3d",[817,879,880,885,888],{},[835,881,882],{},[685,883,884],{},".mks",[835,886,887],{},"Subtitle-only Matroska",[835,889,890],{},"No current IANA registration",[690,892,893,894,896,897,899,900,904,905,911],{},"Use ",[685,895,687],{}," or its replacement ",[685,898,734],{}," for ",[697,901,902],{"href":699},[685,903,702],{},", not for every file based on Matroska.",[705,906,907],{},[697,908,714],{"href":709,"ariaDescribedBy":909,"dataFootnoteRef":712,"id":910},[711],"user-content-fnref-1-4",[705,912,913],{},[697,914,754],{"href":751,"ariaDescribedBy":915,"dataFootnoteRef":712,"id":916},[711],"user-content-fnref-3-2",[680,918,920],{"id":919},"history-and-standardization","History and standardization",[690,922,923,924,930],{},"The Matroska project began on December 6, 2002 as a fork of the Multimedia Container Format project. It chose EBML so the container could evolve without making older readers reject every unfamiliar element.",[705,925,926],{},[697,927,722],{"href":719,"ariaDescribedBy":928,"dataFootnoteRef":712,"id":929},[711],"user-content-fnref-2-3",[705,931,932],{},[697,933,937],{"href":934,"ariaDescribedBy":935,"dataFootnoteRef":712,"id":936},"#user-content-fn-5",[711],"user-content-fnref-5","5",[690,939,940,941],{},"Matroska version 4 is the current format version. Versions 1 through 3 are no longer maintained, but versioning rules are designed so newer files can remain usable by older readers when they avoid unsupported features.",[705,942,943],{},[697,944,722],{"href":719,"ariaDescribedBy":945,"dataFootnoteRef":712,"id":946},[711],"user-content-fnref-2-4",[690,948,949,950,952,953,955,956,962],{},"In October 2024, the IETF published RFC 9559 on the Standards Track. The RFC defines the container structure and established ",[685,951,734],{}," as the registered media type, making ",[685,954,687],{}," its deprecated alias.",[705,957,958],{},[697,959,714],{"href":709,"ariaDescribedBy":960,"dataFootnoteRef":712,"id":961},[711],"user-content-fnref-1-5",[705,963,964],{},[697,965,722],{"href":719,"ariaDescribedBy":966,"dataFootnoteRef":712,"id":967},[711],"user-content-fnref-2-5",[680,969,971,972,974],{"id":970},"how-to-open-a-videox-matroska-file","How to open a ",[685,973,687],{}," file",[690,976,977,978,986,987],{},"For local playback, VLC lists Matroska among its supported input formats.",[705,979,980],{},[697,981,985],{"href":982,"ariaDescribedBy":983,"dataFootnoteRef":712,"id":984},"#user-content-fn-6",[711],"user-content-fnref-6","6"," MKVToolNix is useful when you need to inspect tracks, create an MKV, change container metadata, or extract a stream without treating the whole file as one video track.",[705,988,989],{},[697,990,994],{"href":991,"ariaDescribedBy":992,"dataFootnoteRef":712,"id":993},"#user-content-fn-7",[711],"user-content-fnref-7","7",[690,996,997,998,1006],{},"Native browser support is more dependent on both browser and codec. Firefox 145 added MKV support for commonly used combinations including AVC, HEVC, VP8, VP9, AV1, AAC, Opus, and Vorbis.",[705,999,1000],{},[697,1001,1005],{"href":1002,"ariaDescribedBy":1003,"dataFootnoteRef":712,"id":1004},"#user-content-fn-8",[711],"user-content-fnref-8","8"," Other browser and device combinations may accept only some Matroska files.",[1008,1009,1010],"tip",{},"If an MKV plays video without sound, or sound without video, inspect its individual codecs and selected tracks. The container may be valid even when one stream is unsupported.",[680,1012,1014],{"id":1013},"matroska-support-in-poly","Matroska support in Poly",[690,1016,1017,1018,1022,1023,1025],{},"Poly recognizes ",[697,1019,1020],{"href":699},[685,1021,702],{}," files as ",[685,1024,687],{},". For supported streams, you can:",[1027,1028,1029,1033,1036,1039,1042],"ul",{},[1030,1031,1032],"li",{},"Browse with a representative thumbnail and timeline previews.",[1030,1034,1035],{},"Play the video in Poly and jump to a relevant moment.",[1030,1037,1038],{},"Find it by filename, spoken transcript, and sampled visual content.",[1030,1040,1041],{},"Review available details such as duration, dimensions, frame rate, codecs, color information, and audio tracks.",[1030,1043,1044],{},"Ask the Poly agent about supported visual content, speech, and metadata.",[690,1046,1047],{},"Speech search and transcript-based answers require a usable audio track with audible speech. Silent video can still benefit from visual search. Playback and content-aware features depend on the codecs carried by the MKV.",[690,1049,1050,1051,1054],{},"See ",[697,1052,58],{"href":1053},"\u002Ffile-browser\u002Fsupported-file-types#video"," for the compact video feature comparison.",[680,1056,1058,1059],{"id":1057},"mkv-compared-with-webm","MKV compared with ",[697,1060,1062],{"href":1061},"\u002Fmime-types\u002Fvideo\u002Fwebm","WebM",[690,1064,1065,1067,1068,1074,1075,1079,1080,1086],{},[697,1066,1062],{"href":1061}," is based on Matroska, but it deliberately narrows the permitted codecs and features for web delivery.",[705,1069,1070],{},[697,1071,754],{"href":751,"ariaDescribedBy":1072,"dataFootnoteRef":712,"id":1073},[711],"user-content-fnref-3-3"," An ",[697,1076,1077],{"href":699},[685,1078,702],{}," file and a ",[697,1081,1083],{"href":1082},"\u002Ffile-extensions\u002Fwebm",[685,1084,1085],{},".webm"," file can share the same underlying EBML structure without being interchangeable.",[811,1088,1089,1103],{},[814,1090,1091],{},[817,1092,1093,1096,1099],{},[820,1094,1095],{},"Property",[820,1097,1098],{},"Matroska MKV",[820,1100,1101],{},[697,1102,1062],{"href":1061},[830,1104,1105,1116,1133,1149,1163],{},[817,1106,1107,1110,1113],{},[835,1108,1109],{},"Main goal",[835,1111,1112],{},"Flexible multimedia container",[835,1114,1115],{},"Web-focused media delivery",[817,1117,1118,1121,1127],{},[835,1119,1120],{},"Typical extension",[835,1122,1123],{},[697,1124,1125],{"href":699},[685,1126,702],{},[835,1128,1129],{},[697,1130,1131],{"href":1082},[685,1132,1085],{},[817,1134,1135,1138,1142],{},[835,1136,1137],{},"MIME type",[835,1139,1140],{},[685,1141,734],{},[835,1143,1144],{},[697,1145,1146],{"href":1061},[685,1147,1148],{},"video\u002Fwebm",[817,1150,1151,1154,1157],{},[835,1152,1153],{},"Codec choice",[835,1155,1156],{},"Broad and extensible",[835,1158,1159,1160],{},"Restricted by the ",[697,1161,1162],{"href":1061},"WebM specification",[817,1164,1165,1168,1171],{},[835,1166,1167],{},"Chapters, attachments, and track options",[835,1169,1170],{},"Broad support",[835,1172,1173],{},"More constrained profile",[690,1175,1176,1177,1181,1182,1186,1187,1190],{},"Changing ",[697,1178,1179],{"href":699},[685,1180,702],{}," to ",[697,1183,1184],{"href":1082},[685,1185,1085],{}," is safe only when the file already meets ",[697,1188,1189],{"href":1061},"WebM's"," requirements and is remuxed correctly. Otherwise, compatible tracks must be selected or transcoded.",[680,1192,1194,1195,1199,1200],{"id":1193},"converting-mkv-to-mp4-or-webm","Converting MKV to ",[697,1196,1198],{"href":1197},"\u002Fmime-types\u002Fvideo\u002Fmp4","MP4"," or ",[697,1201,1062],{"href":1061},[690,1203,1204],{},"Choose a destination based on where the result must play:",[811,1206,1207,1220],{},[814,1208,1209],{},[817,1210,1211,1214,1217],{},[820,1212,1213],{},"Goal",[820,1215,1216],{},"Practical choice",[820,1218,1219],{},"What to verify",[830,1221,1222,1235,1248,1259],{},[817,1223,1224,1227,1232],{},[835,1225,1226],{},"Broad device playback",[835,1228,1229,1231],{},[697,1230,1198],{"href":1197}," with widely supported video and audio codecs",[835,1233,1234],{},"Video, audio, subtitles, duration, and synchronization",[817,1236,1237,1240,1245],{},[835,1238,1239],{},"Web delivery",[835,1241,1242,1244],{},[697,1243,1062],{"href":1061}," with a permitted codec combination",[835,1246,1247],{},"Target-browser support and subtitle behavior",[817,1249,1250,1253,1256],{},[835,1251,1252],{},"Preserve quality",[835,1254,1255],{},"Remux compatible streams without re-encoding",[835,1257,1258],{},"Destination-container codec support",[817,1260,1261,1264,1267],{},[835,1262,1263],{},"Keep every track and attachment",[835,1265,1266],{},"Retain the original MKV",[835,1268,1269],{},"Player support for all included features",[690,1271,1272],{},"Remuxing changes the container without changing compatible encoded streams, so it is fast and does not introduce generation loss. Transcoding decodes and re-encodes a track, which can improve compatibility but may reduce quality. Keep the original until you have checked every required audio, subtitle, chapter, and attachment.",[1274,1275,1276,1277],"warning",{},"Treat MKV files from unknown sources as untrusted input. Matroska can carry attachments and many codec payloads. RFC 9559 says readers must not execute attachments and should validate any attachment they use or extract.",[705,1278,1279],{},[697,1280,722],{"href":719,"ariaDescribedBy":1281,"dataFootnoteRef":712,"id":1282},[711],"user-content-fnref-2-6",[1284,1285,1288,1293],"section",{"className":1286,"dataFootnotes":712},[1287],"footnotes",[680,1289,1292],{"className":1290,"id":711},[1291],"sr-only","Footnotes",[1294,1295,1296,1354,1406,1437,1453,1470,1487,1504],"ol",{},[1030,1297,1299,1300,1309,1310,1314,1315,1317,1318,1325,1326,1325,1333,1325,1340,1325,1347],{"id":1298},"user-content-fn-1","Internet Assigned Numbers Authority. ",[697,1301,1305],{"href":1302,"rel":1303},"https:\u002F\u002Fwww.iana.org\u002Fassignments\u002Fmedia-types\u002Fvideo\u002Fmatroska",[1304],"nofollow",[1306,1307,1308],"em",{},"video\u002Fmatroska Media Type Registration",". The registration names ",[697,1311,1312],{"href":699},[685,1313,702],{},", lists ",[685,1316,687],{}," as a deprecated alias, and defines no media-type parameters or magic number. ",[697,1319,1324],{"href":1320,"ariaLabel":1321,"className":1322,"dataFootnoteBackref":712},"#user-content-fnref-1","Back to reference 1",[1323],"data-footnote-backref","↩"," ",[697,1327,1324,1331],{"href":1328,"ariaLabel":1329,"className":1330,"dataFootnoteBackref":712},"#user-content-fnref-1-2","Back to reference 1-2",[1323],[705,1332,722],{},[697,1334,1324,1338],{"href":1335,"ariaLabel":1336,"className":1337,"dataFootnoteBackref":712},"#user-content-fnref-1-3","Back to reference 1-3",[1323],[705,1339,754],{},[697,1341,1324,1345],{"href":1342,"ariaLabel":1343,"className":1344,"dataFootnoteBackref":712},"#user-content-fnref-1-4","Back to reference 1-4",[1323],[705,1346,788],{},[697,1348,1324,1352],{"href":1349,"ariaLabel":1350,"className":1351,"dataFootnoteBackref":712},"#user-content-fnref-1-5","Back to reference 1-5",[1323],[705,1353,937],{},[1030,1355,1357,1358,1365,1366,1325,1371,1325,1378,1325,1385,1325,1392,1325,1399],{"id":1356},"user-content-fn-2","RFC Editor. ",[697,1359,1362],{"href":1360,"rel":1361},"https:\u002F\u002Fwww.rfc-editor.org\u002Frfc\u002Frfc9559.html",[1304],[1306,1363,1364],{},"RFC 9559: Matroska Media Container Format Specification",". IETF Standards Track specification for the container, versioning, tracks, chapters, attachments, tags, and security considerations. ",[697,1367,1324],{"href":1368,"ariaLabel":1369,"className":1370,"dataFootnoteBackref":712},"#user-content-fnref-2","Back to reference 2",[1323],[697,1372,1324,1376],{"href":1373,"ariaLabel":1374,"className":1375,"dataFootnoteBackref":712},"#user-content-fnref-2-2","Back to reference 2-2",[1323],[705,1377,722],{},[697,1379,1324,1383],{"href":1380,"ariaLabel":1381,"className":1382,"dataFootnoteBackref":712},"#user-content-fnref-2-3","Back to reference 2-3",[1323],[705,1384,754],{},[697,1386,1324,1390],{"href":1387,"ariaLabel":1388,"className":1389,"dataFootnoteBackref":712},"#user-content-fnref-2-4","Back to reference 2-4",[1323],[705,1391,788],{},[697,1393,1324,1397],{"href":1394,"ariaLabel":1395,"className":1396,"dataFootnoteBackref":712},"#user-content-fnref-2-5","Back to reference 2-5",[1323],[705,1398,937],{},[697,1400,1324,1404],{"href":1401,"ariaLabel":1402,"className":1403,"dataFootnoteBackref":712},"#user-content-fnref-2-6","Back to reference 2-6",[1323],[705,1405,985],{},[1030,1407,1409,1410,1417,1418,1325,1423,1325,1430],{"id":1408},"user-content-fn-3","Matroska Project. ",[697,1411,1414],{"href":1412,"rel":1413},"https:\u002F\u002Fwww.matroska.org\u002F",[1304],[1306,1415,1416],{},"Matroska Media Container Homepage",". Format variants and the relationship between Matroska and WebM. ",[697,1419,1324],{"href":1420,"ariaLabel":1421,"className":1422,"dataFootnoteBackref":712},"#user-content-fnref-3","Back to reference 3",[1323],[697,1424,1324,1428],{"href":1425,"ariaLabel":1426,"className":1427,"dataFootnoteBackref":712},"#user-content-fnref-3-2","Back to reference 3-2",[1323],[705,1429,722],{},[697,1431,1324,1435],{"href":1432,"ariaLabel":1433,"className":1434,"dataFootnoteBackref":712},"#user-content-fnref-3-3","Back to reference 3-3",[1323],[705,1436,754],{},[1030,1438,1357,1440,1447,1448],{"id":1439},"user-content-fn-4",[697,1441,1444],{"href":1442,"rel":1443},"https:\u002F\u002Fwww.rfc-editor.org\u002Frfc\u002Frfc8794.html",[1304],[1306,1445,1446],{},"RFC 8794: Extensible Binary Meta Language",". EBML header structure and document-type identification. ",[697,1449,1324],{"href":1450,"ariaLabel":1451,"className":1452,"dataFootnoteBackref":712},"#user-content-fnref-4","Back to reference 4",[1323],[1030,1454,1456,1457,1464,1465],{"id":1455},"user-content-fn-5","Library of Congress. ",[697,1458,1461],{"href":1459,"rel":1460},"https:\u002F\u002Fwww.loc.gov\u002Fpreservation\u002Fdigital\u002Fformats\u002Ffdd\u002Ffdd000342.shtml",[1304],[1306,1462,1463],{},"Matroska Multimedia Container",". Format history, identifiers, adoption, and preservation context. ",[697,1466,1324],{"href":1467,"ariaLabel":1468,"className":1469,"dataFootnoteBackref":712},"#user-content-fnref-5","Back to reference 5",[1323],[1030,1471,1473,1474,1481,1482],{"id":1472},"user-content-fn-6","VideoLAN. ",[697,1475,1478],{"href":1476,"rel":1477},"https:\u002F\u002Fwww.videolan.org\u002Fvlc\u002Ffeatures.html",[1304],[1306,1479,1480],{},"VLC Features",". Supported input containers include Matroska. ",[697,1483,1324],{"href":1484,"ariaLabel":1485,"className":1486,"dataFootnoteBackref":712},"#user-content-fnref-6","Back to reference 6",[1323],[1030,1488,1490,1491,1498,1499],{"id":1489},"user-content-fn-7","MKVToolNix. ",[697,1492,1495],{"href":1493,"rel":1494},"https:\u002F\u002Fmkvtoolnix.download\u002F",[1304],[1306,1496,1497],{},"Matroska Tools for Linux, Unix, and Windows",". First-party description of tools for creating, altering, and inspecting Matroska files. ",[697,1500,1324],{"href":1501,"ariaLabel":1502,"className":1503,"dataFootnoteBackref":712},"#user-content-fnref-7","Back to reference 7",[1323],[1030,1505,1507,1508,1515,1516],{"id":1506},"user-content-fn-8","MDN Web Docs. ",[697,1509,1512],{"href":1510,"rel":1511},"https:\u002F\u002Fdeveloper.mozilla.org\u002Fen-US\u002Fdocs\u002FMozilla\u002FFirefox\u002FReleases\u002F145",[1304],[1306,1513,1514],{},"Firefox 145 Release Notes for Developers",". Matroska support and the listed codec combinations. ",[697,1517,1324],{"href":1518,"ariaLabel":1519,"className":1520,"dataFootnoteBackref":712},"#user-content-fnref-8","Back to reference 8",[1323],{"title":712,"searchDepth":1522,"depth":1522,"links":1523},2,[1524,1526,1527,1528,1530,1531,1533,1535],{"id":682,"depth":1522,"text":1525},"What does video\u002Fx-matroska mean?",{"id":762,"depth":1522,"text":763},{"id":919,"depth":1522,"text":920},{"id":970,"depth":1522,"text":1529},"How to open a video\u002Fx-matroska file",{"id":1013,"depth":1522,"text":1014},{"id":1057,"depth":1522,"text":1532},"MKV compared with WebM",{"id":1193,"depth":1522,"text":1534},"Converting MKV to MP4 or WebM",{"id":711,"depth":1522,"text":1292},"Learn what `video\u002Fx-matroska` identifies, why `video\u002Fmatroska` replaced it, how to open MKV files, and how Poly supports them.","md",null,{},{"name":687,"extensions":1541,"alternate-versions":1542,"invented-date":1543,"inventor-name":1544,"in-use":12,"browser-support":1545,"example-applications":1547,"poly-support":1550,"poly-indexed":1551,"poly-preview":1552,"poly-agent":1553},[702],[734],"2002","Matroska project",[1546],"Firefox",[1548,1549],"VLC media player","MKVToolNix","Yes. Poly recognizes `.mkv` files and supports decodable video and audio for preview, search, metadata, and agent use.","Yes. Poly indexes the filename, available technical metadata, spoken transcript, and sampled visual content. Transcripts require usable audio.","Yes. Poly provides a thumbnail, timeline previews, and in-app playback when the file's streams can be decoded.","Yes. The Poly agent can use supported visual content, transcript, and metadata. Results depend on decodable streams and audible speech.","\u002Fmime-types\u002Fvideo\u002Fx-matroska",{"title":1556,"description":1557},"video\u002Fx-matroska MIME Type: MKV Support and Conversion","A practical guide to the video\u002Fx-matroska MIME type, MKV files, browser and application support, Poly features, and conversion options.","mime-types\u002Fvideo\u002Fx-matroska","XSboncNmevxqcfwm5NcCd4hR273zeI4yf7Wof4ERt28",[1538,1538],{"data":1562,"body":1563},{},{"type":1564,"children":1565},"root",[1566],{"type":1567,"tag":690,"props":1568,"children":1569},"element",{},[1570],{"type":1571,"value":675},"text",{"data":1573,"body":1574},{},{"type":1564,"children":1575},[1576],{"type":1567,"tag":690,"props":1577,"children":1578},{},[1579,1581,1586,1588,1593],{"type":1571,"value":1580},"Learn what ",{"type":1567,"tag":685,"props":1582,"children":1584},{"className":1583},[],[1585],{"type":1571,"value":687},{"type":1571,"value":1587}," identifies, why ",{"type":1567,"tag":685,"props":1589,"children":1591},{"className":1590},[],[1592],{"type":1571,"value":734},{"type":1571,"value":1594}," replaced it, how to open MKV files, and how Poly supports them.",1788325917403]