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Apple device specifications, for example, document ",[701,733,734],{"href":703},[685,735,706],{}," files carrying H.264 or MPEG-4 video with AAC audio.",[709,738,739],{},[701,740,744],{"href":741,"ariaDescribedBy":742,"dataFootnoteRef":716,"id":743},"#user-content-fn-2",[715],"user-content-fnref-2","2",[746,747,748,750,751,756,757,765],"note",{},[685,749,687],{}," is a widely used but unregistered media type. It does not appear in the IANA media type registry. 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Apple explains that the ",[685,853,850],{}," box distinguishes closely related MPEG-4, ",[701,856,857],{"href":729},"QuickTime",", and JPEG 2000 structures, but also notes that the box is optional in QuickTime-compatible files.",[709,860,861],{},[701,862,866],{"href":863,"ariaDescribedBy":864,"dataFootnoteRef":716,"id":865},"#user-content-fn-8",[715],"user-content-fnref-8","8",[690,868,869],{},"Therefore, a reliable inspector should:",[871,872,873,881,887,890],"ul",{},[874,875,876,877,798],"li",{},"Check the box sizes and hierarchy rather than trusting ",[701,878,879],{"href":703},[685,880,706],{},[874,882,883,884,886],{},"Read the major and compatible brands when an ",[685,885,850],{}," box exists.",[874,888,889],{},"Inspect every track's codec before deciding whether playback is possible.",[874,891,892],{},"Treat the media type as a hint, not proof of the exact streams inside.",[690,894,895,896,899,900,903,904,906],{},"Renaming ",[685,897,898],{},"movie.m4v"," to ",[685,901,902],{},"movie.mp4"," changes only its filename. It may help software that rejects an unfamiliar extension when the underlying file is otherwise ordinary ",[701,905,725],{"href":724},", but it does not remove access controls, repair invalid boxes, or convert an unsupported codec.",[680,908,910],{"id":909},"how-to-open-an-m4v-file","How to open an M4V file",[690,912,913,914,918,919,726,923,929,930,936,942],{},"Apple's AVFoundation recognizes M4V directly, and Apple's published device specifications list ",[701,915,916],{"href":703},[685,917,706],{}," alongside ",[701,920,921],{"href":790},[685,922,793],{},[701,924,926],{"href":925},"\u002Ffile-extensions\u002Fmov",[685,927,928],{},".mov"," for supported H.264, MPEG-4, and AAC combinations.",[709,931,932],{},[701,933,718],{"href":713,"ariaDescribedBy":934,"dataFootnoteRef":716,"id":935},[715],"user-content-fnref-1-2",[709,937,938],{},[701,939,744],{"href":741,"ariaDescribedBy":940,"dataFootnoteRef":716,"id":941},[715],"user-content-fnref-2-2"," QuickTime Player and the Apple TV app are natural first choices on Apple platforms.",[690,944,945,946,948,949,957,958,962],{},"Modern browsers can play the common ",[701,947,725],{"href":724}," combination of H.264 video and AAC audio. MDN describes that combination as supported by every major browser.",[709,950,951],{},[701,952,956],{"href":953,"ariaDescribedBy":954,"dataFootnoteRef":716,"id":955},"#user-content-fn-9",[715],"user-content-fnref-9","9"," Browser success still depends on the tracks inside the M4V, the codec profiles supported by the device, and whether the file is protected. Browser compatibility tables usually track the container and codec combination, not ",[701,959,960],{"href":703},[685,961,706],{}," as an independent format.",[964,965,966],"tip",{},"If an M4V has sound but no picture, or picture but no sound, inspect both codec names. The container may be recognized even when one track cannot be decoded.",[690,968,969,970,978,979,798],{},"Some downloaded Apple purchases require an authorized computer and the Apple Account used for the purchase. Apple currently allows up to five authorized computers for purchased content.",[709,971,972],{},[701,973,977],{"href":974,"ariaDescribedBy":975,"dataFootnoteRef":716,"id":976},"#user-content-fn-10",[715],"user-content-fnref-10","10"," A protected purchase is not an ordinary conversion source, even if its filename ends in ",[701,980,981],{"href":703},[685,982,706],{},[680,984,986],{"id":985},"m4v-support-in-poly","M4V support in Poly",[690,988,989,990,994,995,997],{},"Poly recognizes ",[701,991,992],{"href":703},[685,993,706],{}," files as ",[685,996,687],{},". For supported audio and video streams, Poly provides the same practical capabilities as its other common video formats:",[871,999,1000,1003,1006,1009,1012],{},[874,1001,1002],{},"A representative thumbnail and timeline previews for navigating the video.",[874,1004,1005],{},"In-app playback that can seek to a matching moment.",[874,1007,1008],{},"Available technical details such as duration, dimensions, frame rate, codecs, color information, and audio tracks.",[874,1010,1011],{},"Search across the filename, spoken transcript, and sampled visual content.",[874,1013,1014],{},"Access to supported visual content, transcript, and metadata through the Poly agent.",[690,1016,1017],{},"Transcript search requires usable audio with audible speech. A silent video can still be visually searchable. Protected, damaged, or unsupported streams may limit playback, content indexing, and agent access.",[690,1019,1020,1021,1024],{},"See ",[701,1022,58],{"href":1023},"\u002Ffile-browser\u002Fsupported-file-types#video"," for the compact video feature comparison.",[680,1026,1028,1029,726,1031],{"id":1027},"m4v-compared-with-mp4-and-mov","M4V compared with ",[701,1030,725],{"href":724},[701,1032,1033],{"href":729},"MOV",[690,1035,1036,1037,1039,1040,1042],{},"M4V, ",[701,1038,725],{"href":724},", and ",[701,1041,1033],{"href":729}," can look similar because their structures share ancestry, but the labels communicate different expectations.",[1044,1045,1046,1065],"table",{},[1047,1048,1049],"thead",{},[1050,1051,1052,1056,1059,1062],"tr",{},[1053,1054,1055],"th",{},"Label",[1053,1057,1058],{},"Typical extension",[1053,1060,1061],{},"Media type",[1053,1063,1064],{},"Practical meaning",[1066,1067,1068,1087,1115],"tbody",{},[1050,1069,1070,1074,1080,1084],{},[1071,1072,1073],"td",{},"M4V",[1071,1075,1076],{},[701,1077,1078],{"href":703},[685,1079,706],{},[1071,1081,1082],{},[685,1083,687],{},[1071,1085,1086],{},"Apple's iTunes video file convention; may be an ordinary compatible video or an account-controlled purchase.",[1050,1088,1089,1094,1100,1106],{},[1071,1090,1091],{},[701,1092,1093],{"href":724},"MP4 video",[1071,1095,1096],{},[701,1097,1098],{"href":790},[685,1099,793],{},[1071,1101,1102],{},[701,1103,1104],{"href":724},[685,1105,755],{},[1071,1107,1108,1109],{},"Standards-registered MPEG-4 presentation for broad interchange and web delivery.",[709,1110,1111],{},[701,1112,772],{"href":769,"ariaDescribedBy":1113,"dataFootnoteRef":716,"id":1114},[715],"user-content-fnref-4-2",[1050,1116,1117,1122,1128,1135],{},[1071,1118,1119],{},[701,1120,1121],{"href":729},"QuickTime movie",[1071,1123,1124],{},[701,1125,1126],{"href":925},[685,1127,928],{},[1071,1129,1130],{},[701,1131,1132],{"href":729},[685,1133,1134],{},"video\u002Fquicktime",[1071,1136,1137,1138],{},"A QuickTime movie whose compatible brands and tracks must be read from the file.",[709,1139,1140],{},[701,1141,866],{"href":863,"ariaDescribedBy":1142,"dataFootnoteRef":716,"id":1143},[715],"user-content-fnref-8-2",[690,1145,1146,1147,1151,1152,1039,1156,1160,1161,1167],{},"The extension does not identify the codec. Apple has shipped ",[701,1148,1149],{"href":703},[685,1150,706],{},", ",[701,1153,1154],{"href":790},[685,1155,793],{},[701,1157,1158],{"href":925},[685,1159,928],{}," support for the same H.264\u002FAAC and MPEG-4\u002FAAC combinations.",[709,1162,1163],{},[701,1164,744],{"href":741,"ariaDescribedBy":1165,"dataFootnoteRef":716,"id":1166},[715],"user-content-fnref-2-3"," Conversely, two M4V files can have different playback results if their codecs, profiles, metadata, or access controls differ.",[680,1169,1171,1172,1174,1175],{"id":1170},"converting-m4v-to-mp4-or-webm","Converting M4V to ",[701,1173,725],{"href":724}," or ",[701,1176,1178],{"href":1177},"\u002Fmime-types\u002Fvideo\u002Fwebm","WebM",[690,1180,1181],{},"Choose a conversion method after inspecting the source:",[1044,1183,1184,1197],{},[1047,1185,1186],{},[1050,1187,1188,1191,1194],{},[1053,1189,1190],{},"Goal",[1053,1192,1193],{},"Approach",[1053,1195,1196],{},"Result",[1066,1198,1199,1212,1231,1244],{},[1050,1200,1201,1204,1209],{},[1071,1202,1203],{},"Broader compatibility",[1071,1205,1206,1207],{},"Remux compatible, unprotected tracks into ",[701,1208,725],{"href":724},[1071,1210,1211],{},"Changes the container labeling without recompressing the media.",[1050,1213,1214,1217,1222],{},[1071,1215,1216],{},"Maximum web compatibility",[1071,1218,1219,1220],{},"Encode H.264 video and AAC audio in ",[701,1221,725],{"href":724},[1071,1223,1224,1225],{},"Uses the combination MDN recommends for broad browser playback.",[709,1226,1227],{},[701,1228,956],{"href":953,"ariaDescribedBy":1229,"dataFootnoteRef":716,"id":1230},[715],"user-content-fnref-9-2",[1050,1232,1233,1236,1241],{},[1071,1234,1235],{},"Open web delivery",[1071,1237,1238,1239],{},"Encode a suitable codec combination in ",[701,1240,1178],{"href":1177},[1071,1242,1243],{},"Produces a web-focused alternative, but requires re-encoding when the original tracks are incompatible.",[1050,1245,1246,1249,1252],{},[1071,1247,1248],{},"Preserve an Apple purchase",[1071,1250,1251],{},"Keep the original and use an authorized Apple app",[1071,1253,1254],{},"Avoids discarding purchase metadata or access information.",[690,1256,1257],{},"Remuxing is fast and preserves encoded quality, but it works only when the destination container accepts every required track. Re-encoding can improve compatibility at the cost of time and a possible generational quality loss. Always check duration, synchronization, subtitles, multiple audio tracks, color, and HDR behavior before discarding the source.",[1259,1260,1261],"warning",{},"Treat downloaded M4V files as untrusted input. Box lengths, codec configuration, subtitle tracks, and metadata all require validation. Use maintained playback or conversion software, and do not assume that a familiar extension makes a file safe.",[1263,1264,1267,1272],"section",{"className":1265,"dataFootnotes":716},[1266],"footnotes",[680,1268,1271],{"className":1269,"id":715},[1270],"sr-only","Footnotes",[1273,1274,1275,1304,1348,1371,1398,1421,1448,1464,1490,1514],"ol",{},[874,1276,1278,1279,1288,1289,1296,1297],{"id":1277},"user-content-fn-1","Apple Developer Documentation. ",[701,1280,1284],{"href":1281,"rel":1282},"https:\u002F\u002Fdeveloper.apple.com\u002Fdocumentation\u002Favfoundation\u002Favfiletype\u002Fm4v",[1283],"nofollow",[1285,1286,1287],"em",{},"AVFileType.m4v",". Apple identifies M4V as the iTunes video file format and documents its UTI and extension. ",[701,1290,1295],{"href":1291,"ariaLabel":1292,"className":1293,"dataFootnoteBackref":716},"#user-content-fnref-1","Back to reference 1",[1294],"data-footnote-backref","↩"," ",[701,1298,1295,1302],{"href":1299,"ariaLabel":1300,"className":1301,"dataFootnoteBackref":716},"#user-content-fnref-1-2","Back to reference 1-2",[1294],[709,1303,744],{},[874,1305,1307,1308,1315,1316,1151,1320,1039,1324,1328,1329,1296,1334,1296,1341],{"id":1306},"user-content-fn-2","Apple Support. ",[701,1309,1312],{"href":1310,"rel":1311},"https:\u002F\u002Fsupport.apple.com\u002Fen-us\u002F111929",[1283],[1285,1313,1314],{},"Apple TV 4K (1st generation): Technical Specifications",". The video-format list documents ",[701,1317,1318],{"href":703},[685,1319,706],{},[701,1321,1322],{"href":790},[685,1323,793],{},[701,1325,1326],{"href":925},[685,1327,928],{}," with supported H.264, MPEG-4, and AAC combinations. ",[701,1330,1295],{"href":1331,"ariaLabel":1332,"className":1333,"dataFootnoteBackref":716},"#user-content-fnref-2","Back to reference 2",[1294],[701,1335,1295,1339],{"href":1336,"ariaLabel":1337,"className":1338,"dataFootnoteBackref":716},"#user-content-fnref-2-2","Back to reference 2-2",[1294],[709,1340,744],{},[701,1342,1295,1346],{"href":1343,"ariaLabel":1344,"className":1345,"dataFootnoteBackref":716},"#user-content-fnref-2-3","Back to reference 2-3",[1294],[709,1347,764],{},[874,1349,1351,1352,1359,1360,1362,1363,1365,1366],{"id":1350},"user-content-fn-3","Internet Assigned Numbers Authority. ",[701,1353,1356],{"href":1354,"rel":1355},"https:\u002F\u002Fwww.iana.org\u002Fassignments\u002Fmedia-types\u002Fmedia-types.xhtml",[1283],[1285,1357,1358],{},"Media Types Registry",". The video registry includes ",[685,1361,755],{}," but not ",[685,1364,687],{},". ",[701,1367,1295],{"href":1368,"ariaLabel":1369,"className":1370,"dataFootnoteBackref":716},"#user-content-fnref-3","Back to reference 3",[1294],[874,1372,1374,1375,1382,1383,1385,1386,1296,1391],{"id":1373},"user-content-fn-4","RFC Editor. ",[701,1376,1379],{"href":1377,"rel":1378},"https:\u002F\u002Fwww.rfc-editor.org\u002Frfc\u002Frfc4337",[1283],[1285,1380,1381],{},"RFC 4337: MIME Type Registration for MPEG-4",". The registration assigns ",[685,1384,755],{}," to MPEG-4 presentations containing a visual stream. ",[701,1387,1295],{"href":1388,"ariaLabel":1389,"className":1390,"dataFootnoteBackref":716},"#user-content-fnref-4","Back to reference 4",[1294],[701,1392,1295,1396],{"href":1393,"ariaLabel":1394,"className":1395,"dataFootnoteBackref":716},"#user-content-fnref-4-2","Back to reference 4-2",[1294],[709,1397,744],{},[874,1399,1401,1402,1409,1410,794,1414,1365,1416],{"id":1400},"user-content-fn-5","Apple Developer Documentation Archive. ",[701,1403,1406],{"href":1404,"rel":1405},"https:\u002F\u002Fdeveloper.apple.com\u002Flibrary\u002Farchive\u002Fdocumentation\u002FAppleApplications\u002FReference\u002FSafariWebContent\u002FCreatingVideoforSafarioniPhone\u002FCreatingVideoforSafarioniPhone.html",[1283],[1285,1407,1408],{},"Creating Video for Safari on iPhone",". Its server table pairs ",[701,1411,1412],{"href":703},[685,1413,706],{},[685,1415,687],{},[701,1417,1295],{"href":1418,"ariaLabel":1419,"className":1420,"dataFootnoteBackref":716},"#user-content-fnref-5","Back to reference 5",[1294],[874,1422,1401,1424,1431,1432,726,1436,1440,1441,1365,1443],{"id":1423},"user-content-fn-6",[701,1425,1428],{"href":1426,"rel":1427},"https:\u002F\u002Fdeveloper.apple.com\u002Flibrary\u002Farchive\u002Fdocumentation\u002FAudioVideo\u002FConceptual\u002FAirPlayGuide\u002FPreparingYourMediaforAirPlay\u002FPreparingYourMediaforAirPlay.html",[1283],[1285,1429,1430],{},"Preparing Your Media and Server for AirPlay",". Its server table groups ",[701,1433,1434],{"href":703},[685,1435,706],{},[701,1437,1438],{"href":790},[685,1439,793],{}," under ",[685,1442,797],{},[701,1444,1295],{"href":1445,"ariaLabel":1446,"className":1447,"dataFootnoteBackref":716},"#user-content-fnref-6","Back to reference 6",[1294],[874,1449,1278,1451,1458,1459],{"id":1450},"user-content-fn-7",[701,1452,1455],{"href":1453,"rel":1454},"https:\u002F\u002Fdeveloper.apple.com\u002Fdocumentation\u002Fquicktime-file-format\u002Fatoms",[1283],[1285,1456,1457],{},"Atoms",". Apple describes the common size-and-type structure and its correspondence with ISO boxes. ",[701,1460,1295],{"href":1461,"ariaLabel":1462,"className":1463,"dataFootnoteBackref":716},"#user-content-fnref-7","Back to reference 7",[1294],[874,1465,1278,1467,1477,1478,1296,1483],{"id":1466},"user-content-fn-8",[701,1468,1471],{"href":1469,"rel":1470},"https:\u002F\u002Fdeveloper.apple.com\u002Fdocumentation\u002Fquicktime-file-format\u002Ffile_type_compatibility_atom",[1283],[1285,1472,1473,1474,1476],{},"File Type Compatibility Atom (",[685,1475,850],{},")",". The atom records a major brand and compatible brands for related container formats. ",[701,1479,1295],{"href":1480,"ariaLabel":1481,"className":1482,"dataFootnoteBackref":716},"#user-content-fnref-8","Back to reference 8",[1294],[701,1484,1295,1488],{"href":1485,"ariaLabel":1486,"className":1487,"dataFootnoteBackref":716},"#user-content-fnref-8-2","Back to reference 8-2",[1294],[709,1489,744],{},[874,1491,1493,1494,1501,1502,1296,1507],{"id":1492},"user-content-fn-9","MDN Web Docs. ",[701,1495,1498],{"href":1496,"rel":1497},"https:\u002F\u002Fdeveloper.mozilla.org\u002Fen-US\u002Fdocs\u002FWeb\u002FMedia\u002FGuides\u002FFormats\u002FVideo_codecs",[1283],[1285,1499,1500],{},"Web Video Codec Guide",". MDN recommends H.264 video and AAC audio in MP4 for broad browser compatibility. ",[701,1503,1295],{"href":1504,"ariaLabel":1505,"className":1506,"dataFootnoteBackref":716},"#user-content-fnref-9","Back to reference 9",[1294],[701,1508,1295,1512],{"href":1509,"ariaLabel":1510,"className":1511,"dataFootnoteBackref":716},"#user-content-fnref-9-2","Back to reference 9-2",[1294],[709,1513,744],{},[874,1515,1307,1517,1365,1524],{"id":1516},"user-content-fn-10",[701,1518,1521],{"href":1519,"rel":1520},"https:\u002F\u002Fsupport.apple.com\u002Fkb\u002Fht1420",[1283],[1285,1522,1523],{},"Authorize or Deauthorize Your Computer for Apple Account Purchases",[701,1525,1295],{"href":1526,"ariaLabel":1527,"className":1528,"dataFootnoteBackref":716},"#user-content-fnref-10","Back to reference 10",[1294],{"title":716,"searchDepth":1530,"depth":1530,"links":1531},2,[1532,1534,1535,1536,1537,1539,1541],{"id":682,"depth":1530,"text":1533},"What does video\u002Fx-m4v mean?",{"id":826,"depth":1530,"text":827},{"id":909,"depth":1530,"text":910},{"id":985,"depth":1530,"text":986},{"id":1027,"depth":1530,"text":1538},"M4V compared with MP4 and MOV",{"id":1170,"depth":1530,"text":1540},"Converting M4V to MP4 or WebM",{"id":715,"depth":1530,"text":1271},"Learn what `video\u002Fx-m4v` identifies, how M4V relates to MP4, which software opens it, and how Poly supports M4V video files.","md",null,{},{"name":687,"extensions":1547,"invented-date":1548,"inventor-name":1549,"in-use":12,"browser-support":1550,"example-applications":1556,"poly-support":1559,"poly-indexed":1560,"poly-preview":1561,"poly-agent":1562},[706],"Unknown","Apple Inc.",[1551,1552,1553,1554,1555],"Chrome","Edge","Firefox","Opera","Safari",[1557,1558],"Apple TV","QuickTime Player","Yes. Poly recognizes `.m4v` videos and processes supported audio and video content for playback, search, and metadata.","Yes. Poly indexes the filename, available technical metadata, spoken transcript, and sampled visual content. A transcript requires a usable audio track.","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-m4v",{"title":1565,"description":1566},"video\u002Fx-m4v MIME Type: M4V Format, Playback, and Conversion","A practical guide to the video\u002Fx-m4v MIME type, the .m4v video container, browser and app compatibility, Poly support, and conversion to MP4.","mime-types\u002Fvideo\u002Fx-m4v","FbSWOo0AjHNGaIl3kKPBjEOKeova41Q08VC_5qo4on8",[1544,1544],{"data":1571,"body":1572},{},{"type":1573,"children":1574},"root",[1575],{"type":1576,"tag":690,"props":1577,"children":1578},"element",{},[1579],{"type":1580,"value":675},"text",{"data":1582,"body":1583},{},{"type":1573,"children":1584},[1585],{"type":1576,"tag":690,"props":1586,"children":1587},{},[1588,1590,1595],{"type":1580,"value":1589},"Learn what ",{"type":1576,"tag":685,"props":1591,"children":1593},{"className":1592},[],[1594],{"type":1580,"value":687},{"type":1580,"value":1596}," identifies, how M4V relates to MP4, which software opens it, and how Poly supports M4V video files.",1788325917403]