{"id":422,"date":"2022-01-31T18:40:07","date_gmt":"2022-01-31T10:40:07","guid":{"rendered":"http:\/\/192.168.0.122:8088\/?p=422"},"modified":"2022-06-11T03:10:30","modified_gmt":"2022-06-10T19:10:30","slug":"%e5%b0%81%e8%a3%85%e6%a0%bc%e5%bc%8f%e5%88%86%e6%9e%90-mp4","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=422","title":{"rendered":"\u5c01\u88c5\u683c\u5f0f\u5206\u6790-MP4"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u58f0\u660e\uff1aMP4 \u7684\u5c01\u88c5\u683c\u5f0f\u662f\u6bd4\u8f83\u590d\u6742\u7684\uff0c\u672c\u6587\u4e0d\u4f1a\u628a MP4 \u7684\u5404\u4e2a\u5b57\u6bb5\uff0c\u5404\u79cd\u573a\u666f\u7528\u6cd5\u90fd\u7f57\u5217\u51fa\u6765\uff0c\u90a3\u6837\u4f1a\u5f62\u6210\u4e00\u4e2a\u624b\u518c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6587\u672c\u4e3b\u8981\u8bb2\u89e3 MP4 \u8fd9\u79cd\u5c01\u88c5\u683c\u5f0f\u5728\u97f3\u89c6\u9891\u5f00\u53d1\u4e2d\u6bd4\u8f83\u5e38\u7528\u7684\u5b57\u6bb5\uff0c\u8fd8\u6709\u4e00\u4e9b\u5173\u952e\u7684\u77e5\u8bc6\u70b9\u3002\u8ba9\u521d\u5b66\u8005\u638c\u63e1 MP4 \u7684\u4e00\u4e9b\u57fa\u672c\u6982\u5ff5\uff0c\u7136\u540e\u5b66\u4f1a\u770bMP4\u6807\u51c6\u6587\u6863\u6df1\u5165\u4e86\u89e3\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u8d44\u6e90\u4e0b\u8f7d\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>a.mp4\u4e0b\u8f7d\u94fe\u63a5\uff1a<a href=\"https:\/\/pan.baidu.com\/s\/1RN1xRsQDGx65MGyB_T1IzA\">\u767e\u5ea6\u7f51\u76d8<\/a>\uff0c\u63d0\u53d6\u7801\uff1anl0s \u3002<\/li><li>Mp4Explorer.exe \u4e0b\u8f7d\u94fe\u63a5\uff1a<a href=\"https:\/\/pan.baidu.com\/s\/1y8jJIwG87ZTX_zwN-5jpAA\">\u767e\u5ea6\u7f51\u76d8<\/a>\uff0c\u63d0\u53d6\u7801\uff1a039r \u3002<\/li><\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">MP4 \u683c\u5f0f \u662f\u4e00\u4e2a box \u7684\u683c\u5f0f\uff0cbox \u5bb9\u5668 \u5957 box \u5b50\u5bb9\u5668\uff0cbox \u5b50\u5bb9\u5668 \u518d\u5957 box \u5b50\u5bb9\u5668\u3002\u770b\u8d77\u6765\u8ddf json \u5f88\u50cf\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0b\u56fe \u662f a.mp4 \u7684 box \u7ed3\u6784\u3002\u4f7f\u7528\u7684\u8f6f\u4ef6\u662f Mp4Explorer\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"828\" height=\"641\" src=\".\/wp-content\/uploads\/2022\/01\/mp4-1-1.png\" alt=\"\" class=\"wp-image-424\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u89e3\u6790MP4 \u683c\u5f0f\u662f\u8fd9\u6837\u7684\uff0c\u5148\u8bfb4\u4e2a\u5b57\u8282\u3002\u524d4\u4e2a\u5b57\u8282\u662f size\uff0c\u4ee3\u8868\u8fd9\u4e2abox \u6709\u591a\u5927\u3002\u518d\u8bfb 4 \u5b57\u8282\uff0c\u540e4\u5b57\u8282 \u662f type\uff0c\u8868\u660e\u8fd9\u4e2a box \u662f\u4e2a\u4ec0\u4e48box<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8bf7\u770b a.mp4 \u6587\u4ef6 \u7684 16\u8fdb\u5236\u7684\u8868\u793a\uff0c\u63a8\u8350\u4f7f\u7528 notepad ++ 32 \u4f4d hexeditor \u63d2\u4ef6\u67e5\u770b\uff0c\u53ea\u670932\u4f4d\u7684\u624d\u6709\u8fd9\u4e2a\u63d2\u4ef6\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1040\" height=\"564\" src=\".\/wp-content\/uploads\/2022\/01\/mp4-2.png\" alt=\"\" class=\"wp-image-425\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u4e0a\u56fe\u6240\u793a\uff0c\u7528\u4e0d\u540c\u989c\u8272\u753b\u51fa\u4e86 3\u4e2a box\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u9ed1\u8272\u5708\u51fa\u6765\u7684 box \u662f ftyp\uff0c\u5168\u79f0 File Type Box\u3002ftyp \u524d\u9762\u7684 4\u4e2a\u5b57\u8282\u662f 20\uff0816\u8fdb\u5236\uff09\u3002\u4e5f\u5c31\u8bf4\uff0c\u8fd9\u4e2a ftyp box \u662f 32 \u5b57\u8282\u7684\u957f\u5ea6\uff0c32\u5b57\u8282\u662f\u5305\u542b size \u76844\u4e2a\u5b57\u8282\u7684\u3002ftyp \u662f\u4e00\u7ea7 box\uff0c\u91cc\u9762\u6ca1\u6709\u5b50box\u4e86\u3002<\/li><li>\u84dd\u5708\u5708\u51fa\u6765\u7684 box \u662f free\uff0c\u53ea\u6709 8\u4e2a\u5b57\u8282\u5927\u5c0f\uff0csize \u5360 4\u4e2a\u5b57\u8282\uff0ctype \u53604\u4e2a\u5b57\u8282\u3002 free \u8fd9\u4e2abox\u6211\u4e5f\u4e0d\u77e5\u9053\u6709\u4ec0\u4e48\u7528\uff0c\u4e0d\u7528\u7279\u522b\u5173\u6ce8\u3002<\/li><li>\u7ea2\u8272\u5708\u51fa\u6765\u7684 box \u662f mdata\uff0c\u5168\u79f0 Media Data\uff0c\u8fd9\u4e2abox \u662f\u6700\u91cd\u8981\u7684\uff0c ffmpeg \u5c01\u88c5\u7684 AVPacket \u6570\u636e\u5c31\u5b58\u653e\u5728\u8fd9\u4e2abox \u91cc\u9762\u3002mdata \u524d\u9762 4\u4e2a\u5b57\u8282\u662f\u5927\u5c0f\uff0c00 0b 5c 63 , \u4e5f\u5c31\u662f \u8fd9\u4e2a mdata \u6570\u636e\u6709 0b5c63\u4e2a\u5b57\u8282\u3002<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u7531\u7b2c\u4e00\u5f20\u56fe\u53ef\u4ee5\u77e5\u9053\uff0c mdata \u8fd9\u4e2abox \u4e4b\u540e\u5c31\u662f moov box\uff0c\u5982\u4f55\u627e\u5230 moov box \u7684\u4f4d\u7f6e\u5462\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u4e0a\u53ef\u77e5\uff0cmdata box \u7684\u8d77\u59cb\u4f4d\u7f6e\u662f 00000028 \uff0cmdata \u8fd9\u4e2abox \u6709 0b5c63 \u8fd9\u4e48\u5927\uff0c\u6240\u4ee5 moov box \u7684\u4f4d\u7f6e\u7b49\u4e8e 0b5c63 + 28 = 000b5c8b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u4eec\u7528 notepad ++ \u8df3\u8f6c\u5230 000b5c8b \u770b\u770b\u80fd\u4e0d\u80fd\u627e\u5230 moov \u8fd9\u4e2a\u5b57\u7b26\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1004\" height=\"125\" src=\".\/wp-content\/uploads\/2022\/01\/mp4-3.png\" alt=\"\" class=\"wp-image-426\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">000b5c8b 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class=\"wp-block-list\"><li>\u5f53size\u7b49\u4e8e0\u65f6\uff0c\u4ee3\u8868\u8fd9\u4e2aBox\u662f\u6587\u4ef6\u7684\u6700\u540e\u4e00\u4e2aBox\u3002<\/li><li>\u5f53size\u7b49\u4e8e1\u65f6\uff0c\u8bf4\u660eBox\u957f\u5ea6\u9700\u8981\u66f4\u591a\u7684\u4f4d\u6765\u63cf\u8ff0\uff0c\u5728\u540e\u9762\u4f1a\u5b9a\u4e49\u4e00\u4e2a64\u4f4d\u7684 largesize \u7528\u6765\u63cf\u8ff0Box\u7684\u957f\u5ea6\u3002<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"343\" src=\"\/wp-content\/uploads\/2022\/02\/mp4-4.png\" alt=\"\" class=\"wp-image-717\"\/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">google_ads_content<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0b\u9762\u7ee7\u7eed\u8bb2\u89e3 a.mp4 \u91cc\u9762 \u7684 moov box\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>mvhd \uff0c\u5168\u79f0 Movie Header Box\u3002<\/li><li>trak\uff0c\u5168\u79f0 Track Box\uff0c\u901a\u5e38\u4e00\u4e2a\u97f3\u9891\u6d41 \u6216\u8005\u89c6\u9891\u6d41 \u5bf9\u5e94\u4e00\u4e2a trak box\u3002<\/li><li>stbl\uff0c\u5168\u79f0 Sample Table Box \uff0c<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">MP4 \u6700\u91cd\u8981\u7684\u5c31\u662f stbl \u91cc\u9762\u7684\u5b50 box\uff0c\u4f17\u6240\u5468\u77e5\uff0cMP4 \u6bd4 FLV \u7684\u4f18\u52bf\u5c31\u662f\u53ef\u4ee5\u5feb\u901f\u7684seek\uff0c\u8fd9\u662f\u56e0\u4e3aMP4 \u91cc\u9762\u6709\u4e00\u4e2a\u6570\u636e\u7d22\u5f15\u8868\uff0c\u8fd8\u6709\u5173\u952e\u5e27\u8868\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e9b\u8868\u90fd\u5728 stbl box \u91cc\u9762<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1\uff0cstts\uff0c\u5168\u79f0 Decoding Time to Sample Box \u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2\uff0cctts\uff0c\u5168\u79f0 Composition Time to Sample Box\u3002 \u65f6\u95f4\u8865\u507f\uff0c\u7528\u6765\u8ba1\u7b97\u51fa pts\uff0c\u56e0\u4e3amp4 \u662f\u6309 \u89e3\u7801\u987a\u5e8f\u5b58\u50a8\uff0cpacket \u6309 dts \u9012\u589e\uff0c\u6240\u4ee5\u9700\u8981 ctts \u8868\u8ba1\u7b97\u51fapacket \u7684 pts\u3002\u53ea\u6709\u89c6\u9891\u6709\uff0c\u97f3\u9891\u6ca1\u6709\u3002\u56e0\u4e3a\u97f3\u9891 pts dts \u662f\u4e00\u6837\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3\uff0cstss\uff0c\u5168\u79f0 Sync Sample Box\uff0c\u540c\u6b65 \u91c7\u6837\u8868\uff0c\u8868\u660e\u7b2c\u51e0\u5e27\u662f\u5173\u952e\u5e27\uff0c\u5173\u952e\u5e27\u53ef\u4ee5\u7528\u6765\u540c\u6b65\uff0c\u6240\u4ee5\u53eb Sync \u6ca1\u6bdb\u75c5\u3002\u89c6\u9891\u6d41\u624d\u6709\u8fd9\u4e2a box\uff0c\u97f3\u9891\u6d41\u6ca1\u6709\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0b\u9762\u662f stss \u8fd9\u4e2abox \u7684\u622a\u56fe\uff0c\u53ef\u4ee5\u770b\u5230 \u7b2c 1 \u5e27\uff0c\u7b2c 35 \u5e27\uff0c\u7b2c 152 \u5e27 \u662f\u5173\u952e\u5e27\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"749\" height=\"502\" src=\".\/wp-content\/uploads\/2022\/01\/mp4-4-1.png\" alt=\"\" class=\"wp-image-428\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">4\uff0cstsz\uff0c\u5168\u79f0 Sample Size Boxes\uff0c\u8868\u660e\u89c6\u9891\u5e27\u6216\u8005\u97f3\u9891\u5e27\u5927\u5c0f\uff0cFFmpeg \u91cc\u9762\u7684AVPacket \u7684size \u6570\u636e\u5927\u5c0f\uff0c\u5c31\u662f\u4ece\u8fd9\u4e2abox\u4e2d\u6765\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u770b\u5230\uff0c\u97f3\u89c6\u9891\u683c\u5f0f\u591a\u79cd\u591a\u79cd\uff0cflv \u80af\u5b9a\u6ca1\u6709stsz\u8fd9\u4e2a\u8868\uff0c\u4f46\u662f FFmpeg \u65e0\u8bba\u662f\u89e3\u6790flv\uff0c\u8fd8\u662f\u89e3\u6790mp4\uff0c\u51fa\u6765\u7684 AVpacket \u7684size\u8fd8\u662f\u53ef\u4ee5\u7528\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5FFmpeg \u5b9e\u9645\u4e0a\u5c31\u662f\u5bf9\u7eb7\u7e41\u590d\u6742\u7684\u5404\u79cd\u683c\u5f0f\u8fdb\u884c\u4e86\u5c01\u88c5\uff0c\u8ba9\u7f16\u7a0b\u66f4\u901a\u7528\u4e00\u70b9\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0b\u9762\u662f stsz \u8fd9\u4e2abox \u7684\u622a\u56fe\uff0c\u53ef\u4ee5\u770b\u5230 \u7b2c\u4e00\u5e27\u662f\u6bd4\u8f83\u5927\u7684\uff0c\u7b2c\u4e00\u5e27\u662f 31945 \u4e2a\u5b57\u8282\uff0c\u56e0\u4e3a\u4ed6\u662f\u5173\u952e\u5e27\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"747\" height=\"556\" src=\".\/wp-content\/uploads\/2022\/01\/mp4-4-2.png\" alt=\"\" class=\"wp-image-429\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">5\uff0cstsc\uff0c\u5168\u79f0 Sample To Chunk Box\u3002mp4 \u4f1a\u628a\u4e00\u4e2a\u6216\u591a\u4e2a sample \u653e\u5230\u4e00\u4e2achunk \u91cc\u9762\u3002\u5c31\u662f\u4e00\u4e2a chunk\u53ef\u80fd\u4f1a\u6709\u591a\u4e2a\u89c6\u9891\u5e27\uff0c\u4e5f\u53ef\u80fd\u53ea\u6709\u4e00\u4e2a\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"749\" height=\"311\" src=\".\/wp-content\/uploads\/2022\/01\/mp4-4-3.png\" alt=\"\" class=\"wp-image-430\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u56fe \u662f\u89c6\u9891\u6d41\u7684 stsc box \u3002\u91cc\u9762\u6709\u4e24\u884c\u6570\u636e\uff0c\u7b2c\u4e00\u4e2achunk\u91cc\u9762\u67092\u4e2asample\uff0c\u7b2c\u4e8c\u4e2achunk\u91cc\u9762\u6709 1\u4e2asample\u3002\u8fd9\u4e2a\u5e76\u4e0d\u662f\u8bf4\uff0c\u8fd9\u4e2a\u89c6\u9891\u6d41\u53ea\u67093\u4e2asample\uff0c\u4e5f\u5c31\u662f\u53ea\u67093\u5e27\uff0c\u4e0d\u53ef\u80fd\u7684\uff0c\u800c\u662f\u7b2c\u4e09\uff0c\u7b2c\u56db\u884c\u7701\u7565\u4e86\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u7b2c\u4e09\u8ddf\u7b2c\u56db\uff0c\u7b49\u7b49\uff0c\u540e\u9762\u7684chunk \u91cc\u9762\u90fd\u53ea\u67091\u4e2asample\uff0c\u8ddf\u7b2c\u4e8c\u4e2achunk\u4e00\u6837\u3002\u672c\u89c6\u9891\u6d41\u6709239\u4e2achunk\u3002\u56e0\u4e3a\u672c\u89c6\u9891\u6d41\u4e00\u5171240\u5e27\uff0c\u7b2c\u4e00\u4e2achunk\u91cc\u9762\u67092\u5e27\uff0c\u540e\u9762\u7684\u90fd\u662f1\u5e27\uff0c\u6240\u4ee5\u8ba1\u7b97\u51fa\u6765\u53ea\u6709239\u4e2achunk\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\u4ed6\u8fd9\u4e2a First chunk \u5728\u5217\u8868\u662f\u4ee3\u8868 start \u5f00\u59cb\u7684chunk\uff0c\u5982\u679c\u6709\u4e0b\u4e00\u884c\uff0c\u4e0b\u4e00\u884c\u7684\u503c\u5c31\u662fend \u7ed3\u675f\u3002\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">chunk \u8ddf sample \u8fd9\u4e2a\u6982\u5ff5\u6bd4\u8f83\u91cd\u8981\uff0cMP4 \u7d22\u5f15\u5b9a\u4f4d\u627e\u5230\u67d0\u4e00\u5e27\uff0c\u5c31\u662f\u5148\u627e\u5230chunk\uff0c\u518d\u627e\u5230sample\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">6\uff0cstco\uff0c\u5168\u79f0 Chunk Offset Box\uff0cchunk\u7684\u4f4d\u7f6e\u8868\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"718\" height=\"481\" src=\".\/wp-content\/uploads\/2022\/01\/mp4-4-4.png\" alt=\"\" class=\"wp-image-431\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u51fa\uff0c\u7b2c\u4e00\u4e2achunk \u5728a.mp4\u6587\u4ef6\u7684 48 \u7684\u4f4d\u7f6e\uff0c\u7b2c\u4e00\u4e2achunk\u91cc\u9762\u6709\u4e24\u5e27\u6570\u636e\u3002\u6211\u4eec\u7528 notepad ++ \u8df3\u5230 48 \u7684\u5730\u65b9\uff0c\u770b\u770b\u5177\u4f53\u5185\u5bb9\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">48 \u8f6c\u6210 16\u8fdb\u5236\u662f 30\u3002\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1052\" height=\"382\" src=\".\/wp-content\/uploads\/2022\/01\/mp4-4-5.png\" alt=\"\" class=\"wp-image-432\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c00000030 \u7684\u5730\u65b9\uff0c\u524d\u9762\u7d27\u7d27\u6328\u7740 mdat\uff0cmdat \u5b57\u7b26\u540e\u9762\u5c31\u662f\u5177\u4f53\u7684\u7f16\u7801\u540e\u7684\u6570\u636e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7\u4e0a\u9762\u8fd9\u4e9b\u7d22\u5f15\u6570\u636e\uff0c\u6211\u4eec\u627e\u5230\u4e86\u7b2c\u4e00\u5e27\u89c6\u9891\u6570\u636e\u7684\u4f4d\u7f6e\uff0c\u6211\u4eec\u73b0\u5728\u6765\u9a8c\u8bc1\u4e00\u4e0b\u5bf9\u4e0d\u5bf9\uff0c\u6253\u5f00 \u4e4b\u524d\u642d\u5efa\u597d\u7684 Qt creator ffplay\u7684\u8c03\u8bd5\u73af\u5883\uff0c\u65ad\u70b9\u67e5\u770b \u7b2c\u4e00\u4e2a packet\u7684\u6570\u636e\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1253\" height=\"657\" src=\".\/wp-content\/uploads\/2022\/01\/mp4-4-6.png\" alt=\"\" class=\"wp-image-433\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u5728 av_read_frame() \u7684\u4f4d\u7f6e\u6253\u4e86\u4e2a\u65ad\u70b9\uff0c\u53ef\u4ee5\u770b\u5230\u8bfb\u51fa\u6765\u7684\u7b2c\u4e00\u4e2a AVPacket \u7684 pos \u503c\u7684\u786e\u662f 48\uff0csize \u7b49\u4e8e 31945 \u4e5f\u80fd\u8ddf stsz box\u8868\u5bf9\u5e94\u4e0a\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u518d\u6765\u67e5\u770b\u4e00\u4e0b\u7b2c\u4e00\u4e2a AVPacket \u7684data \u91cc\u9762\u7684\u6570\u636e\uff0c\u5982\u4e0b\u56fe\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1263\" height=\"687\" src=\".\/wp-content\/uploads\/2022\/01\/mp4-4-7.png\" alt=\"\" class=\"wp-image-434\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u770b\u5230 FFplay \u91cc\u9762\u8bfb\u51fa\u6765\u7684 AVPakcet \u7684data\u6307\u9488\u7684\u6570\u636e\u8ddf\u6211\u4eec\u5728notepad ++ 48\u4f4d\u7f6e\u770b\u5230\u7684\u6570\u636e\u662f\u5b8c\u5168\u4e00\u6837\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b2c\u4e00\u5e27\u89c6\u9891\u7684\u6570\u636e\u4f4d\u7f6e\u627e\u5230\u4e86\uff0c\u90a3\u7b2c\u4e8c\u5e27\u89c6\u9891\u6570\u636e\u600e\u4e48\u627e\u5462\uff1fstsc \u8868\u91cc\u9762\u8bf4\u660e\uff0c\u7b2c\u4e00\u4e2achunk\u6709\u4e24\u9488\u6570\u636e\uff0c\u6240\u4ee5\u7b2c\u4e8c\u4e2a\u89c6\u9891\u5e27\u662f\u7d27\u6328\u7740\u7b2c\u4e00\u5e27\u7684\uff0c\u6240\u4ee5\u7b2c\u4e00\u5e27\u7684\u4f4d\u7f6e 48 \u52a0\u4e0a\u7b2c\u4e00\u5e27\u5927\u5c0f 31945 \u7b49\u4e8e 31993\uff0c\u6362\u7b97\u6210 16 \u8fdb\u5236\u5c31\u662f 7cf9\uff0c\u6240\u4ee5\u7b2c\u4e8c\u5e27\u6570\u636e \u5728\u6587\u4ef6\u7684 00007cf9 \u7684\u4f4d\u7f6e\u3002\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1044\" height=\"531\" src=\".\/wp-content\/uploads\/2022\/01\/mp4-4-8.png\" alt=\"\" class=\"wp-image-435\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5927\u5bb6\u53ef\u4ee5\u81ea\u884c\u7528qt \u6253\u5370\u7b2c\u4e8c\u4e2a\u89c6\u9891\u5e27\u7684AVPacket\u7684data\u6570\u636e\u9a8c\u8bc1\u4f4d\u7f6e\u5bf9\u4e0d\u5bf9\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">stco \uff08chunk\u7d22\u5f15\u8868\uff09\uff0cstsc\uff08sample chunk\u8868\uff09\uff0cstsz \uff08sample \u5927\u5c0f\u8868\uff09\u3002\u7b80\u5355\u7684\u901a\u8fc7\u8fd93\u4e2a\u8868\u627e\u5230\u5bf9\u5e94\u5e27\u7684\u4f4d\u7f6e\u5df2\u7ecf\u8bb2\u89e3\u5b8c\u4e86\u3002\u4e0b\u9762\u6765\u8bb2\u89e3 \u6309\u65f6\u95f4 seek\uff0cmp4\u53ef\u4ee5\u600e\u4e48\u5b9e\u73b0\uff0c\u4f8b\u5982 \u8981\u62d6\u52a8\u89c6\u9891\u5230 \u7b2c2\u79d2\u7684\u65f6\u5019\u64ad\u653e\uff0c\u56e0\u4e3a a.mp4 \u662f24\u5e27\u7387\u7684\u89c6\u9891\uff0c\u6240\u4ee5\u7b2c\u4e8c\u79d2\u5c31\u662f 1* 24 = 24\uff0c\u4e5f\u5c31\u662f\u4ece24\u5e27\u5f00\u59cb\u64ad\u653e\uff0c\u90a324\u5e27\u7684\u6570\u636e\u5728\u54ea\u91cc\u5462\uff1f\u56e0\u4e3a stsc \u8868\u91cc\u9762\u7b2c\u4e00\u4e2achunk\u5360\u4e86 2\u4e2a\u5e27\uff0c\u540e\u9762\u7684chunk\u90fd\u53ea\u5360\u4e00\u4e2a\u5e27\uff0c\u6240\u4ee5\u7b2c24\u5e27\u5728\u7b2c23\u4e2achunk\u91cc\u9762\uff0c\u6240\u4ee5\u5f80 stco\u8868\u627e\uff0c\u627e\u5230 \u7b2c23\u4e2achunk\u7684\u504f\u79fb\u4f4d\u7f6e\uff0c\u4e5f\u5c31\u662f 64626 \u3002\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"451\" src=\".\/wp-content\/uploads\/2022\/01\/mp4-4-9.png\" alt=\"\" class=\"wp-image-436\"\/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u672c\u6587\u4e3b\u8981\u53ea\u8bb2\u4e86 stbl\uff0cmdat \u8fd9\u4e24\u4e2abox\uff0c\u56e0\u4e3aMP4 \u6700\u5927\u7684\u533a\u522b\u5c31\u662f\u4ed6\u6709\u5f88\u591a\u7d22\u5f15\u6570\u636e\uff0c\u4f8b\u5982\u5173\u952e\u5e27\u7d22\u5f15\uff0c\u666e\u901a\u5e27\u7684\u4f4d\u7f6e\u7d22\u5f15\u7b49\u7b49\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5176\u4ed6\u7684 trak \uff0ctkhd\uff0cmdhd\uff0c\u7b49\u7b49\uff0c\u53ef\u4ee5\u81ea\u884c\u67e5\u770b MP4 \u7684\u6807\u51c6\u8fdb\u884c\u4e86\u89e3\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u97f3\u89c6\u9891\u683c\u5f0f\u7eb7\u7e41\u590d\u6742\uff0c\u4e0b\u9762\u4ecb\u7ecd\u4e00\u79cd\u770b \u6807\u51c6\u6587\u6863\u7684\u65b9\u6cd5\uff0c\u4f8b\u5982 mp4 \u7684\u6807\u51c6 <a href=\"https:\/\/mpeg.chiariglione.org\/standards\/mpeg-4\/iso-base-media-file-format\/text-isoiec-14496-12-5th-edition\">ISO- 14496Part12<\/a> \u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u5982 \u4e4b\u524d\u4ecb\u7ecd\u7684 free box \u4e0d\u77e5\u9053\u662f\u505a\u4ec0\u4e48\uff1f\u6211\u4eec\u53ef\u4ee5\u6253\u5f00 \u6807\u51c6\u6587\u4ef6 w15177_14496-12_5th.-restyle-R5.doc \uff0c\u7136\u540e\u641c\u7d22 free \u8fd9\u4e2a\u5173\u952e\u8bcd\uff0c\u5c31\u80fd\u770b\u5230\u4ee5\u4e0b\u8bf4\u660e\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1087\" height=\"794\" src=\".\/wp-content\/uploads\/2022\/01\/mp4-5.png\" alt=\"\" class=\"wp-image-437\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ca1\u9519\uff0cfree box \u7684\u5168\u79f0\u662f Free Space Box\u3002\u60f3\u77e5\u9053\u67d0\u4e9b box \u7684\u5b9a\u4e49\uff0c\u76f4\u63a5\u5728\u6807\u51c6\u6587\u4ef6\u91cc\u9762\u641c\u5168\u79f0 \u7b49\u5173\u952e\u8bcd\u5373\u53ef\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u770b\u6807\u51c6\u6587\u4ef6\u7684\u76ee\u5f55\uff0c\u4e5f\u80fd\u76f4\u63a5\u770b\u51fa\u5404\u79cd box \u7684\u5b9a\u4e49\u8ddf\u4f5c\u7528\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u4e2a\u4eba\u5efa\u8bae\u53ef\u4ee5\u62bd\u65f6\u95f4\u628a 257 \u9875\u7684mp4 \u6807\u51c6\u8010\u5fc3\u8bfb\u4e00\u904d\uff0c\u8fd9\u6837\u5c31\u4f1a\u5bf9 mp4 \u683c\u5f0f\u975e\u5e38\u719f\u6089\u4e86\u3002257 \u9875\u5176\u5b9e\u4e0d\u591a\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7f51\u4e0a mp4 \u7684\u8d44\u6599\u6bd4\u8f83\u96f6\u788e\uff0c\u5305\u62ec\u672c\u6587\u4e5f\u662f\u53ea\u8bb2\u4e86\u4e00\u5c0f\u90e8\u5206\u7684 MP4 \u5185\u5bb9\u3002\u5b8c\u6574\u7684\u5185\u5bb9\u5176\u5b9e\u5c31\u5728\u6807\u51c6\u6587\u4ef6\u91cc\u9762\uff0c\u6240\u4ee5\u5b66\u4f1a\u770b\u6807\u51c6\u6587\u4ef6\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"871\" height=\"639\" src=\".\/wp-content\/uploads\/2022\/01\/mp4-6.png\" alt=\"\" class=\"wp-image-423\"\/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6269\u5c55\u77e5\u8bc6\uff1a<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b63\u5e38\u60c5\u51b5\u4e0b ffmpeg \u751f\u6210 moov \u662f\u5728 mdat \u5199\u5b8c\u6210\u4e4b\u540e\u518d\u5199\u5165\uff0c\u53ef\u4ee5\u901a\u8fc7\u53c2\u6570 faststart \u5c06 moov \u5bb9\u5668\u79fb\u52a8\u81f3 mdat \u7684\u524d\u9762\uff0c\u5c06 moov \u63d0\u524d \u53ef\u4ee5 \u2f40\u6301http\u8fb9\u4e0b\u8f7d\u8fb9\u64ad\u653e\uff0c\u4e0b\u9762\u53c2\u8003\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code class=\"prettyprint\" >.\/ffmpeg -i input.flv -c copy -f mp4 -movflags faststart output.mp4<\/code><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u76f8\u5173\u9605\u8bfb\uff1a<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>MP4 \u6807\u51c6 <a href=\"https:\/\/mpeg.chiariglione.org\/standards\/mpeg-4\/iso-base-media-file-format\/text-isoiec-14496-12-5th-edition\">ISO- 14496Part12<\/a> \uff0c<\/li><li><a href=\"https:\/\/www.cnblogs.com\/chyingp\/p\/mp4-file-format.html\">5\u5206\u949f\u5165\u95e8 MP4 \u683c\u5f0f<\/a><\/li><li>\u300aFFmpeg \u4ece\u5165\u95e8\u5230\u7cbe\u901a\u300b3.1\u7ae0\u8282 \"\u97f3\u89c6\u9891\u6587\u4ef6\u8f6cMP4\u683c\u5f0f\"<\/li><\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u00a9\u7248\u6743\u6240\u5c5e\uff1a\u77e5\u8bc6\u661f\u7403\uff1a\u5f26\u5916\u4e4b\u97f3\uff0cQQ\uff1a2338195090\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7531\u4e8e\u7b14\u8005\u7684\u6c34\u5e73\u6709\u9650\uff0c \u52a0\u4e4b\u7f16\u5199\u7684\u540c\u65f6\u8fd8\u8981\u53c2\u4e0e\u5f00\u53d1\u5de5\u4f5c\uff0c\u6587\u4e2d\u96be\u514d\u4f1a\u51fa\u73b0\u4e00\u4e9b\u9519\u8bef\u6216\u8005\u4e0d\u51c6\u786e\u7684\u5730\u65b9\uff0c\u6073\u8bf7\u8bfb\u8005\u6279\u8bc4\u6307\u6b63\u3002\u5982\u679c\u8bfb\u8005\u6709\u4efb\u4f55\u5b9d\u8d35\u610f\u89c1\uff0c\u53ef\u4ee5\u52a0\u6211\u5fae\u4fe1 Loken1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u58f0\u660e\uff1aMP4 \u7684\u5c01\u88c5\u683c\u5f0f\u662f\u6bd4\u8f83\u590d\u6742\u7684\uff0c\u672c\u6587\u4e0d\u4f1a\u628a MP4 \u7684\u5404\u4e2a\u5b57\u6bb5\uff0c\u5404\u79cd\u573a\u666f\u7528\u6cd5\u90fd\u7f57\u5217\u51fa\u6765\uff0c\u90a3\u6837\u4f1a\u5f62\u6210\u4e00\u4e2a\u624b [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[37],"tags":[],"class_list":["post-422","post","type-post","status-publish","format-standard","hentry","category-37"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5c01\u88c5\u683c\u5f0f\u5206\u6790-MP4 - \u5f26\u5916\u4e4b\u97f3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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