{"id":3343,"date":"2025-07-26T17:37:30","date_gmt":"2025-07-26T09:37:30","guid":{"rendered":"http:\/\/www.51cos.com\/?p=3343"},"modified":"2025-07-26T17:37:30","modified_gmt":"2025-07-26T09:37:30","slug":"%e5%a6%82%e4%bd%95%e5%88%a4%e6%96%ad%e8%a7%86%e9%a2%91%e9%87%87%e9%9b%86%e5%8d%a1%e9%80%81%e8%bf%87%e6%9d%a5%e7%9a%84h-264%e5%85%b7%e4%bd%93%e7%9a%84%e8%a7%86%e9%a2%91%e6%a0%bc%e5%bc%8f%e6%98%afannex","status":"publish","type":"post","link":"http:\/\/www.51cos.com\/?p=3343","title":{"rendered":"\u5982\u4f55\u5224\u65ad\u89c6\u9891\u91c7\u96c6\u5361\u9001\u8fc7\u6765\u7684H.264\u5177\u4f53\u7684\u89c6\u9891\u683c\u5f0f\u662fAnnex B\u683c\u5f0f\u8fd8\u662fAVCC\u683c\u5f0f\uff1f"},"content":{"rendered":"

\u5148\u7528v4l2-ctl\u547d\u4ee4\u4fdd\u5b58\u89c6\u9891\u91c7\u96c6\u5361\u9001\u8fc7\u6765\u6570\u636e\u4e3atest.h264<\/h3>\n

\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u5de5\u5177\u6765\u786e\u8ba4\uff0c\u4f7f\u7528ffmpeg\uff1a<\/p>\n

#Linux\nffmpeg -i test.h264 -c copy -bsf:v trace_headers -f null - 2>&1 | grep \"nal_unit_type\"\n#Windows\nffmpeg -i test.h264 -c copy -bsf:v trace_headers -f null - 2>&1 | findstr \"nal_unit_type\"\n\n<\/code><\/pre>\n
\u8fd0\u884c ffmpeg<\/code> \u547d\u4ee4\u540e\uff0c\u5982\u679c\u8f93\u51fa\u4e2d\u5305\u542b nal_unit_type<\/code> \u4fe1\u606f\uff0c\u4f60\u53ef\u4ee5\u6839\u636e\u8fd9\u4e9b\u4fe1\u606f\u8fdb\u4e00\u6b65\u5224\u65ad\u89c6\u9891\u683c\u5f0f\uff08Annex B \u6216 AVCC\uff09\uff0c\u5e76\u5206\u6790 H.264 \u7684 NALU\uff08\u7f51\u7edc\u62bd\u8c61\u5c42\u5355\u5143\uff09\u7ed3\u6784\u3002\u4ee5\u4e0b\u662f\u5177\u4f53\u6b65\u9aa4\uff1a<\/p>\n
\n
1. \u89c2\u5bdf nal_unit_type<\/code> \u8f93\u51fa<\/strong><\/h3>\n
\u8fd0\u884c\u547d\u4ee4\u540e\uff0c\u4f60\u4f1a\u770b\u5230\u7c7b\u4f3c\u8fd9\u6837\u7684\u8f93\u51fa\uff08\u793a\u4f8b\uff09\uff1a<\/p>\n
[nal_unit_type: 7(SPS)]  \n[nal_unit_type: 8(PPS)]  \n[nal_unit_type: 5(IDR)]  \n[nal_unit_type: 1(slice)]  \n...\n<\/code><\/pre>\n
    \n
  • nal_unit_type<\/code> \u503c<\/strong>\u4ee3\u8868\u4e0d\u540c\u7684 NALU \u7c7b\u578b\uff0c\u4f8b\u5982\uff1a\n
      \n
    • 7<\/code> = SPS\uff08\u5e8f\u5217\u53c2\u6570\u96c6\uff09<\/li>\n
    • 8<\/code> = PPS\uff08\u56fe\u50cf\u53c2\u6570\u96c6\uff09<\/li>\n
    • 5<\/code> = IDR\u5e27\uff08\u5173\u952e\u5e27\uff09<\/li>\n
    • 1<\/code> = \u975eIDR\u5e27\uff08\u666e\u901a\u5e27\uff09<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
      \n
      2. \u5224\u65ad\u683c\u5f0f\uff08Annex B \u6216 AVCC\uff09<\/strong><\/h3>\n
      (1) \u5982\u679c\u662f Annex B \u683c\u5f0f<\/strong><\/h4>\n
        \n
      • \u6bcf\u4e2a NALU \u524d\u9762\u4f1a\u6709 00 00 01<\/code> \u6216 00 00 00 01<\/code><\/strong> \u8d77\u59cb\u7801\u3002<\/li>\n
      • \u793a\u4f8b\u8f93\u51fa\uff1a\n
        [h264 @ 0x7ff0b8000000] nal_unit_type: 7(SPS), nal_ref_idc: 3, payload_size: 17\n[h264 @ 0x7ff0b8000000] nal_unit_type: 8(PPS), nal_ref_idc: 3, payload_size: 4\n<\/code><\/pre>\n
          \n
        • \u8868\u660e NALU \u76f4\u63a5\u4ee5\u8d77\u59cb\u7801\u5206\u9694\uff0c\u6ca1\u6709\u989d\u5916\u7684\u957f\u5ea6\u524d\u7f00\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
          (2) \u5982\u679c\u662f AVCC \u683c\u5f0f<\/strong><\/h4>\n
            \n
          • \u6bcf\u4e2a NALU \u524d\u9762\u4f1a\u6709 4\u5b57\u8282\u7684\u957f\u5ea6\u4fe1\u606f<\/strong>\uff08\u5927\u7aef\u5e8f\uff09\uff0c\u800c\u4e0d\u662f 00 00 01<\/code>\u3002<\/li>\n
          • \u793a\u4f8b\u8f93\u51fa\uff1a\n
            [h264 @ 0x7ff0b8000000] nal_unit_type: 7(SPS), nal_ref_idc: 3, payload_size: 17\n[extradata] sps_len: 17, pps_len: 4\n<\/code><\/pre>\n
              \n
            • \u8868\u660e NALU \u524d\u9762\u6709\u957f\u5ea6\u524d\u7f00\uff08\u5982 00 00 00 11<\/code> \u8868\u793a 17 \u5b57\u8282\u7684 SPS\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
              \n
              ** \u7ed3\u8bba**<\/h3>\n
                \n
              • \u5982\u679c nal_unit_type<\/code> \u8f93\u51fa\u4e2d\u76f4\u63a5\u663e\u793a SPS\/PPS \u800c\u6ca1\u6709\u957f\u5ea6\u524d\u7f00<\/strong> \u2192 Annex B<\/strong>\u3002<\/li>\n
              • \u5982\u679c ffmpeg<\/code> \u663e\u793a extradata<\/code> \u6216 avc1<\/code><\/strong> \u2192 AVCC<\/strong>\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
                \u5148\u7528v4l2-ctl\u547d\u4ee4\u4fdd\u5b58\u89c6\u9891\u91c7\u96c6\u5361\u9001\u8fc7\u6765\u6570\u636e\u4e3atest.h264 \u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u5de5\u5177\u6765\u786e\u8ba4\uff0c\u4f7f\u7528ffmpeg […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-3343","post","type-post","status-publish","format-standard","hentry","category-embedded"],"_links":{"self":[{"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/posts\/3343","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.51cos.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3343"}],"version-history":[{"count":1,"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/posts\/3343\/revisions"}],"predecessor-version":[{"id":3344,"href":"http:\/\/www.51cos.com\/index.php?rest_route=\/wp\/v2\/posts\/3343\/revisions\/3344"}],"wp:attachment":[{"href":"http:\/\/www.51cos.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3343"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.51cos.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3343"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.51cos.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3343"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}