{"id":414,"date":"2022-01-31T18:27:18","date_gmt":"2022-01-31T10:27:18","guid":{"rendered":"http:\/\/192.168.0.122:8088\/?p=414"},"modified":"2022-01-31T18:27:18","modified_gmt":"2022-01-31T10:27:18","slug":"ffmpeg%e5%91%bd%e4%bb%a4%e5%88%86%e6%9e%90-yuv%e5%b0%81%e8%a3%85mp4","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=414","title":{"rendered":"ffmpeg\u547d\u4ee4\u5206\u6790-yuv\u5c01\u88c5mp4"},"content":{"rendered":"\n<p>\u672c\u7cfb\u5217 \u4ee5 ffmpeg4.2 \u6e90\u7801\u4e3a\u51c6\uff0c\u4e0b\u8f7d\u5730\u5740\uff1a\u94fe\u63a5\uff1a<a href=\"https:\/\/pan.baidu.com\/s\/1VpUvpLhew-nuq4Dns80mOw\">\u767e\u5ea6\u7f51\u76d8<\/a> \u63d0\u53d6\u7801\uff1ag3k8<\/p>\n\n\n\n<p>\u672c\u7cfb\u5217\u4e3b\u8981\u5206\u6790\u5404\u79cd ffmpeg \u547d\u4ee4\u53c2\u6570 \u5728\u4ee3\u7801\u91cc\u662f\u5982\u4f55\u5b9e\u73b0\u7684\u3002a.yuv \u4e0b\u8f7d\u94fe\u63a5\uff1a<a href=\"https:\/\/pan.baidu.com\/s\/19C8TbcW3swj-QFGFh0C2SA\">\u767e\u5ea6\u7f51\u76d8<\/a>\uff0c\u63d0\u53d6\u7801\uff1a1h1w \u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>\u547d\u4ee4\u5982\u4e0b\uff1a<code class=\"prettyprint\" >ffmpeg -s 720*404 -pix_fmt yuv420p -i a.yuv -vcodec libx264 a-666.mp4<\/code><\/p>\n\n\n\n<p>\u4e0a\u9762\u7684\u547d\u4ee4\u662f \u628a yuv \u6570\u636e \u7f16\u7801\u6210 H264\uff0c\u7136\u540e\u5c01\u88c5\u8fdb MP4 \u683c\u5f0f\u91cc\u9762\u3002<\/p>\n\n\n\n<p>yuv\u6587\u4ef6\u672c\u8eab\u6ca1\u6709 \u5bbd\u9ad8\u4fe1\u606f\uff0c\u50cf\u7d20\u683c\u5f0f\u4fe1\u606f\uff0c\u6240\u4ee5\u9700\u8981\u547d\u4ee4\u884c\u6307\u5b9a <strong>-s 720*404<\/strong> \uff0c\u5426\u5219\u4f1a\u62a5\u9519\u3002<\/p>\n\n\n\n<p>\u4e0b\u9762\u5c31\u6765\u8bb2\u89e3 ffmpeg \u5de5\u7a0b \u662f\u5982\u4f55\u8bfb\u53d6 yuv \u6570\u636e\u7684\u3002<\/p>\n\n\n\n<p>\u5148\u770b open_input_file() \u51fd\u6570\uff0c\u6253\u5f00\u8f93\u5165\u6587\u4ef6\u7684\u903b\u8f91\u90fd\u5728\u8fd9\u4e2a\u51fd\u6570\u91cc\u9762\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1621\" height=\"836\" src=\".\/wp-content\/uploads\/2022\/01\/cmd-15-1.png\" alt=\"\" class=\"wp-image-416\"\/><\/figure>\n\n\n\n<p>\u5982\u4e0a\u56fe\u6240\u793a\uff0c\u5728 avformat_open_input() \u51fd\u6570\u524d\u9762\u6253\u4e86\u4e00\u4e2a \u65ad\u70b9\uff0c\u8fd0\u884c\u540e\u53ef\u4ee5\u53d1\u73b0 ic->iformat->long_name \u7b49\u4e8e \"raw video\"\uff0c\u76f4\u63a5\u5728 FFmpeg 4.2 \u7684\u6e90\u7801\u4e2d\u641c\u7d22 \"raw video\" \u8fd9\u4e2a\u5173\u952e\u8bcd\uff0c\u53ef\u4ee5\u53d1\u73b0\uff0cyuv \u7684\u89e3\u6790\u662f\u5728 libavformat\\rawvideodec.c \u91cc\u9762\u5b9e\u73b0\u7684\uff0c\u8bf7\u770b\u4e0b\u9762\u4ee3\u7801<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >libavformat\\rawvideodec.c\r\nAVInputFormat ff_rawvideo_demuxer = {\r\n    .name           = &quot;rawvideo&quot;,\r\n    .long_name      = NULL_IF_CONFIG_SMALL(&quot;raw video&quot;),\r\n    .priv_data_size = sizeof(RawVideoDemuxerContext),\r\n    .read_header    = rawvideo_read_header,\r\n    .read_packet    = rawvideo_read_packet,\r\n    .flags          = AVFMT_GENERIC_INDEX,\r\n    .extensions     = &quot;yuv,cif,qcif,rgb&quot;,\r\n    .raw_codec_id   = AV_CODEC_ID_RAWVIDEO,\r\n    .priv_class     = &amp;rawvideo_demuxer_class,\r\n};<\/code><\/pre>\n\n\n\n<p>\u6211\u4eec\u77e5\u9053\uff0c yuv \u662f\u539f\u59cb\u6570\u636e\uff0c\u4e0d\u9700\u8981\u89e3\u7801\u7684\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\uff0cffmpeg.c \u5de5\u7a0b\u4e2d\u7684 struct InputStream \u7684 dec_ctx \u89e3\u7801\u5668\u4e0a\u4e0b\u6587\u4f1a\u521d\u59cb\u5316\u6210\u4ec0\u4e48\u6837\u5462\uff1f\u7ee7\u7eed\u5206\u6790ffmpeg.c \u7684\u5b9e\u73b0\u3002<\/p>\n\n\n\n<p>\u5728\u300aFFMpeg \u6e90\u7801\u5206\u6790-\u547d\u4ee4\u884c\u300b\u7684\u65f6\u5019\u8bb2\u89e3\u8fc7\uff0c \u521d\u59cb\u5316\u89e3\u7801\u5668\u662f\u5728 add_input_streams() \u51fd\u6570\u91cc\u9762\u5b8c\u6210\u7684\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"2527\" height=\"2220\" src=\".\/wp-content\/uploads\/2022\/01\/cmd-15-2.png\" alt=\"\" class=\"wp-image-415\"\/><\/figure>\n\n\n\n<p>\u5728 add_input_streams() \u51fd\u6570\u91cc\u9762\u7684 avcodec_alloc_context3 \u9644\u8fd1\u6253\u4e00\u4e2a\u65ad\u70b9\uff0c\u770b\u770b\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230 \u5373\u4f7f\u662f yuv \u8fd9\u79cd\u539f\u59cb\u6570\u636e\u683c\u5f0f\uff0c\u4e0d\u9700\u8981\u8fdb\u884c\u89e3\u7801\u64cd\u4f5c\uff0cffmpeg\u4e5f\u58f0\u660e\u4e86\u4e00\u4e2a\u89e3\u7801\u7c7b\u3002\u4e5f\u5c31\u662f libavcodec\\rawdec.c \u8fd9\u4e2a\u6587\u4ef6\u3002<\/p>\n\n\n\n<p>\u5e94\u8be5\u662f\u4e3a\u4e86api 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