{"id":305,"date":"2022-01-31T17:01:49","date_gmt":"2022-01-31T09:01:49","guid":{"rendered":"http:\/\/192.168.0.122:8088\/?p=305"},"modified":"2022-06-11T03:19:26","modified_gmt":"2022-06-10T19:19:26","slug":"ffmpeg%e6%ba%90%e7%a0%81%e5%88%86%e6%9e%90-open_output_file","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=305","title":{"rendered":"ffmpeg\u6e90\u7801\u5206\u6790-open_output_file"},"content":{"rendered":"\n

\u672c\u7cfb\u5217 \u4ee5 ffmpeg4.2 \u6e90\u7801\u4e3a\u51c6\uff0c\u4e0b\u8f7d\u5730\u5740\uff1a\u94fe\u63a5\uff1a\u767e\u5ea6\u7f51\u76d8<\/a> \u63d0\u53d6\u7801\uff1ag3k8<\/p>\n\n\n\n

ffmpeg \u6e90\u7801\u5206\u6790\u7cfb\u5217\u4ee5\u4e00\u6761\u7b80\u5355\u7684\u547d\u4ee4\u5f00\u59cb\uff0cffmpeg -i a.mp4 b.flv<\/code>\uff0c\u5206\u6790\u5176\u5185\u90e8\u903b\u8f91\u3002<\/p>\n\n\n\n

a.mp4\u4e0b\u8f7d\u94fe\u63a5\uff1a\u767e\u5ea6\u7f51\u76d8<\/a>\uff0c\u63d0\u53d6\u7801\uff1anl0s \u3002<\/p>\n\n\n\n

\n\n\n\n

\u672c\u6587\u7ae0\u4e3b\u8981\u5206\u6790 open_output_file()<\/code> \u7684\u5185\u90e8\u903b\u8f91\u3002<\/p>\n\n\n\n

\u7b80\u5355\u8f6c\u7801\u547d\u4ee4 \u7684 open_output_file()<\/code> \u6d41\u7a0b\u56fe\u5982\u4e0b\uff0c\u4e00\u4e9b\u53c2\u6570\u8d4b\u503c\u7684\u5185\u5bb9\u6ca1\u6709\u753b\u51fa\u6765\uff0c\u53ea\u6709\u4e3b\u5e72\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u7406\u89e3 open_output_file()<\/code>\uff0c\u5fc5\u987b\u5148\u4e86\u89e3 2\u4e2a\u65b0\u7684\u6570\u636e\u7ed3\u6784\uff0cOutputFile<\/code>\uff0cOutputStream<\/code>\uff0c\u8bf7\u5148\u770b\u6e90\u7801\u81ea\u884c\u9605\u8bfb\u8fd9\u4e24\u4e2a\u7ed3\u6784\u4f53\u7684\u58f0\u660e\u3002\u8dd1\u5b8c open_output_file()<\/code> \u4e4b\u540e\u5f62\u6210\u7684\u6570\u636e\u5173\u7cfb\u56fe\u5982\u4e0b\uff0c\u8ddf\u4e0a\u4e00\u7ae0\u7684\u8f93\u5165\u975e\u5e38\u7c7b\u4f3c\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u4e0b\u9762\u518d\u8d34\u4e00\u4e2a open_output_file()<\/code> \u7684\u4ee3\u7801\u56fe\uff0c\u56e0\u4e3a open_output_file()<\/code> \u91cc\u9762\u7684\u903b\u8f91\u5206\u652f\u6bd4\u8f83\u591a\uff0c\u5728 ffmpeg -i a.mp4 b.flv<\/code> \u4e0b\u5e76\u4e0d\u4f1a\u8dd1\u8fdb\u53bb\u67d0\u4e9b if<\/code> \u6761\u4ef6\uff0c\u6240\u4ee5\u4ee3\u7801\u56fe\u4e3a\u4e86\u7b80\u6d01\uff0c\u4f1a\u5220\u51cf\u4e00\u4e9bif<\/code>\uff0c\u6709\u4e00\u4e9b\u53c2\u6570\u8d4b\u503c\u4e5f\u4f1a\u5220\u6389\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n

\u63a5\u4e0b\u6765\u4f1a\u9010\u884c\u4ee3\u7801\u5206\u6790 open_output_file()<\/code> \u7684\u5185\u90e8\u903b\u8f91\u3002<\/p>\n\n\n\n

  1. \u56fe\u72471873~1894<\/code> \u884c\uff0c\u7533\u660e\u4e00\u4e2a OutputFile<\/code> \u7ed3\u6784 \uff0c\u4e22\u8fdb\u53bb\u5168\u5c40\u53d8\u91cf\u6570\u7ec4 outpur_files[]<\/code>\uff0c\u7136\u540e\u628a OptionsContext<\/code> \u7684\u4e00\u4e9b\u503c\u8d4b\u503c\u7ed9 of<\/code>\u3002<\/li>
  2. \u56fe\u72471914~2083<\/code> \u884c\uff0c\u8fd9\u4e2a\u4ee3\u7801\u5757\u662f\u6bd4\u8f83\u91cd\u8981\u7684\uff0c\u9996\u5148\u6839\u636e\u7b97\u6cd5\uff0c\u9009\u51fa\u8f93\u5165\u6d41\u91cc\u6700\u597d\u7684 video \u6d41 idx<\/code>\uff0c\u7136\u540e\u8c03\u7528 new_video_stream(o, oc, idx)<\/code> \u6765\u521b\u5efa\u8f93\u51fa\u6d41\u3002new_video_stream()<\/code> \u51fd\u6570\u6bd4\u8f83\u590d\u6742\uff0c\u8fd9\u91cc\u7b80\u5355\u4ecb\u7ecd\uff0c\u4e0b\u4e00\u6bb5\u518d\u4ed4\u7ec6\u5206\u6790\u3002 audio\u6d41\u7c7b\u4f3c video\u6d41\uff0c\u4e5f\u662f\u6839\u636e\u7b97\u6cd5\u9009\u51fa\u6700\u597d idx<\/code>\uff0c\u7136\u540e\u8c03 new_audio_stream(o, oc, idx);<\/code><\/li>
  3. \u56fe\u72472090~2132<\/code> \u884c\uff0c\u8fd9\u90e8\u5206\u4ee3\u7801\u4e3b\u8981\u5bf9\u547d\u4ee4\u884c\u53c2\u6570\u505a\u4e9b\u68c0\u6d4b\uff0c\u68c0\u6d4b\u54ea\u4e9boption \u6ca1\u6709\u7528\u5230\uff0c\u547d\u4ee4\u884c\u5199\u9519\u4e86\uff0c\u7ed9\u63d0\u793a\u3002\u4e0d\u662f\u4e3b\u8981\u903b\u8f91\u3002<\/li>
  4. \u56fe\u72472133~2213<\/code> \u884c\uff0c\u8fd9\u90e8\u5206\u4ee3\u7801\u5c31\u662f\u904d\u5386\u8f93\u51fa\u6d41\uff0c\u7136\u540e\u8c03 init_simple_filtergraph(ist, ost)<\/code> \u521d\u59cb\u5316Filter\uff0c\u8fd9\u5757\u6bd4\u8f83\u91cd\u8981\uff0c\u8981\u7ec6\u770b\u3002<\/li>
  5. \u540e\u9762\u7684\u4ee3\u7801\u90fd\u4e0d\u91cd\u8981\uff0c\u90fd\u662f\u4e00\u4e9b\u68c0\u6d4b\uff0c\u53c2\u6570\u8d4b\u503c\uff0c\u5904\u7406metadata\uff0c\u5904\u7406chapter\uff0c\u540e\u9762\u7684\u4ee3\u7801\u6700\u91cd\u8981\u7684\u662f\u8c03\u4e86 avio_open2()<\/code> \u6253\u5f00\u8f93\u51fa\u6587\u4ef6<\/li><\/ol>\n\n\n\n

    \u5982\u6b64\u770b\u6765\uff0copen_output_file()<\/code> \u7684\u5185\u90e8\u903b\u8f91\u5c31\u53d8\u5f97\u6781\u5176\u7b80\u5355\u4e86\uff0c\u521b\u5efa OutputFile<\/code>\uff0c\u7528OptionsContext<\/code>\u6765\u8d4b\u503c\uff0c\u8c03new_video_stream()<\/code> \uff0cnew_audio_stream()<\/code> \u521b\u5efa\u8f93\u51fa\u6d41\uff0c\u6700\u540e\u521d\u59cb\u5316 filter\uff0c\u7136\u540eavio_open2()<\/code>\u6253\u5f00\u8f93\u51fa\u6587\u4ef6\u3002<\/p>\n\n\n\n

    \n\n\n\n

    google_ads_content<\/p>\n\n\n\n

    \n\n\n\n

    \u4e0a\u9762\u6709\u4e24\u4e2a\u51fd\u6570\u6ca1\u6709\u4ed4\u7ec6\u4ecb\u7ecd new_video_stream()<\/code> new_audio_stream()<\/code> \uff0c\u63a5\u4e0b\u6765\u4ed4\u7ec6\u5206\u6790\u3002<\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    new_video_stream()<\/code>\u7684\u903b\u8f91\u76f8\u5bf9\u7b80\u5355\u3002\u5982\u4e0b\u9762\u7684\u6d41\u7a0b\u56fe\u6240\u793a\uff0cnew_video_stream()<\/code> \u91cc\u9762\u6709\u4e2a new_output_stream()<\/code>\uff0c<\/p>\n\n\n\n

    new_output_stream()<\/code> \u4e3b\u8981\u521b\u5efa stream\uff0c\u7f16\u7801\u5668context\uff0c\u7136\u540e\u505a\u4e00\u4e9b\u521d\u59cb\u5316\u3002<\/p>\n\n\n\n

    new_output_stream()<\/code> \u662f\u4e00\u4e2a\u516c\u5171\u51fd\u6570\uff0c\u97f3\u9891\u6d41\uff0c\u6570\u636e\u6d41\uff0c\u5b57\u5e55\u6d41\u90fd\u7528\u4e86\u5b83\uff0c\u6240\u4ee5 ffmpeg<\/code> \u628a\u4ed6\u5206\u51fa\u6765\u3002video_stream \u7684\u4e00\u4e9b\u521d\u59cb\u5316\u4f1a\u5728\u8c03\u7528 new_output_stream()<\/code> \u540e\u6267\u884c\u3002<\/p>\n\n\n\n

    \u6bd4\u8f83\u6ce8\u610f\u7684\u4e00\u70b9\u662f\uff0cnew_video_stream()<\/code> \u8ddf new_output_stream()<\/code> \u91cc\u9762\u7528\u4e86\u5927\u91cf\u7684 MATCH_PER_STREAM_OPT()<\/code>\uff0c\u628a OptionsContex<\/code> \u7684\u53c2\u6570\u63d0\u53d6\u51fa\u6765\uff0c\u8d4b\u503c\u7ed9 stream\u53c2\u6570\uff0c\u6216\u8005\u8d4b\u503c\u7ed9\u7f16\u7801\u5668\u53c2\u6570\u3002\u6240\u4ee5\u4e00\u5b9a\u8981\u7406\u89e3 MATCH_PER_STREAM_OPT()<\/code> \u7684\u5b9e\u73b0\u3002<\/p>\n\n\n\n

    new_audio_stream()<\/code>\u8ddf new_video_stream()<\/code> \u7c7b\u4f3c\uff0c\u53ea\u662f new_audio_stream()<\/code> \u8c03\u4e86 new_output_stream()<\/code> \uff0c\u5bf9\u97f3\u9891\u6d41\u6216\u7f16\u7801\u5668\u7684\u67d0\u4e9b\u53c2\u6570\u8d4b\u503c\u3002<\/p>\n\n\n\n

    \n\n\n\n

    \u6700\u540e\u8fd8\u6709\u4e00\u4e2a\u91cd\u8981\u51fd\u6570\u6ca1\u6709\u5206\u6790\uff0cinit_simple_filtergraph<\/code>()\uff0c\u5373\u4f7f\u662f\u7b80\u5355\u7684\u8f6c\u7801\u547d\u4ee4\uff0cffmpeg<\/code> \u4e3a\u4e86\u901a\u7528\u6027\uff0c\u4e5f\u662f\u4f1a\u521b\u5efa filter<\/code> \u7684\uff0c\u53ea\u4e0d\u8fc7\u662f null filter<\/code> \u8ddf anull filter<\/code>\u3002\u7a7a\u7684\u89c6\u9891\u6d41 filter<\/code>\uff0c\u7a7a\u7684\u97f3\u9891\u6d41filter<\/code>\u3002<\/p>\n\n\n\n

    init_simple_filtergraph()<\/code> \u7684\u903b\u8f91\u6bd4\u8f83\u7b80\u5355\uff0c\u53ea\u662f\u770b init_simple_filtergraph()<\/code> \uff0c\u4e0d\u592a\u5bb9\u6613\u770b\u51fafilter\u7684\u6574\u4f53\u903b\u8f91\u8ddf\u5173\u7cfb\u7ed3\u6784\uff0c\u9700\u8981\u540e\u9762\u5206\u6790 transcode()\u8f6c\u7801\u51fd\u6570 \uff0cifilter_send_frame()<\/code> \u8c03\u7528\u4e86 configure_filtergraph()<\/code> \u624d\u80fd\u5f62\u6210\u5b8c\u6574\u7684\u5173\u7cfb\u7ed3\u6784\u4f53\u3002\u8fd9\u91cc\u5c3d\u91cf\u7b80\u5355\u4ecb\u7ecd\uff0c\u6709\u4e2a\u5370\u8c61\u3002<\/p>\n\n\n\n

    init_simple_filtergraph()<\/code> \u8dd1\u5b8c\u4e4b\u540e\u5f62\u6210\u7684\u5173\u7cfb\u7ed3\u6784\u5982\u4e0b\u3002<\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    \u5982\u56fe\u6240\u793a\uff0c\u6709\u4e00\u4e2a\u5168\u5c40\u53d8\u91cf\u6570\u7ec4 filtergraphs[]<\/code>\uff0c\u4e00\u4e2a FilterGraph<\/code> \u91cc\u6709\u4e00\u4e2aInputFilter<\/code> \u8ddf\u4e00\u4e2a OutputFilter<\/code> \u3002InputFilter<\/code> \u8ddf OutputFilter<\/code> \u53c8\u5404\u81ea\u6709\u8f93\u5165\u8ddf\u8f93\u51fa\u6d41\uff0c\u6240\u4ee5\u4ee3\u7801\u8dd1\u5230\u8fd9\u91cc\uff0c\u5df2\u7ecf\u786e\u5b9a\u628a\u8f93\u5165\u8f93\u51fa\u6d41\u5173\u8054\u5728\u4e00\u8d77\u4e86\u3002<\/p>\n\n\n\n

    \u53ea\u8981\u5728\u8f93\u5165\u6d41\u8bfb\u6570\u636e\uff0c\u7136\u540e\u5f80\u8f93\u5165\u6d41\u5173\u8054\u7684\u8f93\u51fa\u6d41\u4e22\u6570\u636e\u5c31\u5b8c\u6210\u8f6c\u7801\u4e86\u3002\u5176\u5b9e\u4e4b\u524d OutputStream<\/code> \u91cc\u9762\u6709\u4e2a source_index<\/code> \u6210\u5458\u672c\u8eab\u5df2\u7ecf\u5173\u8054\u4e86\u8f93\u5165\u6d41\uff0c\u8fd8\u8981\u628a \u8f93\u5165\u8f93\u51fa\u6d41 \u5173\u8054\u5230 filter \uff0c\u7136\u540e\u4e22\u8fdb\u53bb FilterGraph<\/code> \u662f\u56e0\u4e3a \u8f93\u5165\u8f93\u51fa\u6d41\u867d\u7136\u5173\u8054\u4e86\uff0c\u4f46\u4ed6\u4eec\u7684filter \u8fd8\u6ca1\u5173\u8054\u8d77\u6765\u3002<\/p>\n\n\n\n

    FilterGraph::InputFilter<\/code> \u8ddf FilterGraph::OutputFilter<\/code> \u5728 init_simple_filtergraph()<\/code> \u91cc\u9762\u4e5f\u8fd8\u6ca1\u5f00\u59cb\u5173\u8054\uff0c\u5173\u8054\u4e4b\u540e\u5c31\u53ef\u4ee5 \u53d1\u9001 frame \u5230 buffersrc<\/code> \uff0c\u4ece buffersink<\/code> \u51fa\u53e3\u8bfbframe\uff0c\u4e0d\u4e86\u89e3filter\u7684\uff0c\u8bf7\u5148\u81ea\u5df1\u4e86\u89e3filter\u7684\u57fa\u672c\u7528\u6cd5\u3002<\/p>\n\n\n\n

    \u5173\u8054 FilterGraph::InputFilter<\/code> \u8ddf FilterGraph::OutputFilter<\/code> \u662f\u5728\u540e\u9762\u7684 configure_filtergraph()<\/code> \u91cc\u5b8c\u6210\u7684\u3002<\/p>\n\n\n\n

    \u81f3\u6b64\uff0copen_output_file()<\/code> \u5185\u90e8\u903b\u8f91\u5df2\u7ecf\u5206\u6790\u5b8c\u6bd5<\/p>\n\n\n\n

    \n\n\n\n

    \u00a9\u7248\u6743\u6240\u5c5e\uff1a\u77e5\u8bc6\u661f\u7403\uff1a\u5f26\u5916\u4e4b\u97f3\uff0cQQ\uff1a2338195090\u3002<\/p>\n\n\n\n

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