{"id":123353,"date":"2024-03-24T10:52:17","date_gmt":"2024-03-24T01:52:17","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/go%e3%81%a7ffmpeg%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e3%82%aa%e3%83%bc%e3%83%87%e3%82%a3%e3%82%aa%e3%81%ae%e5%90%88%e6%88%90%e3%81%a8%e5%88%86%e5%89%b2%e3%82%92%e5%ae%9f%e8%a1%8c%e3%81%99\/"},"modified":"2024-04-06T00:10:02","modified_gmt":"2024-04-05T15:10:02","slug":"go%e3%81%a7ffmpeg%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e3%82%aa%e3%83%bc%e3%83%87%e3%82%a3%e3%82%aa%e3%81%ae%e5%90%88%e6%88%90%e3%81%a8%e5%88%86%e5%89%b2%e3%82%92%e5%ae%9f%e8%a1%8c%e3%81%99","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/go%e3%81%a7ffmpeg%e3%82%92%e4%bd%bf%e7%94%a8%e3%81%97%e3%81%a6%e3%82%aa%e3%83%bc%e3%83%87%e3%82%a3%e3%82%aa%e3%81%ae%e5%90%88%e6%88%90%e3%81%a8%e5%88%86%e5%89%b2%e3%82%92%e5%ae%9f%e8%a1%8c%e3%81%99\/","title":{"rendered":"Go\u3067FFmpeg\u3092\u4f7f\u7528\u3057\u3066\u30aa\u30fc\u30c7\u30a3\u30aa\u306e\u5408\u6210\u3068\u5206\u5272\u3092\u5b9f\u884c\u3059\u308b"},"content":{"rendered":"<p>Go\u8a00\u8a9e\u3067\u306fCGo\u3092\u5229\u7528\u3057\u3066FFmpeg\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u547c\u3073\u51fa\u3057\u3001\u97f3\u58f0\u306e\u5408\u6210\u3084\u5206\u5272\u3092\u5b9f\u73fe\u3067\u304d\u308b\u3002<\/p>\n<p>\u307e\u305a\u3001FFmpeg\u30e9\u30a4\u30d6\u30e9\u30ea\u304c\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u3001\u74b0\u5883\u5909\u6570\u306bFFmpeg\u306e\u30d1\u30b9\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<p>Go\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u3001CGo\u3068C\u30e9\u30a4\u30d6\u30e9\u30ea\u30d8\u30c3\u30c0\u30fc\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u3080\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">package<\/span> main\r\n<span class=\"hljs-comment\">\/*\r\n#include &lt;libavcodec\/avcodec.h&gt;\r\n#include &lt;libavformat\/avformat.h&gt;\r\n#include &lt;libavutil\/avutil.h&gt;\r\n#include &lt;libswscale\/swscale.h&gt;\r\n*\/<\/span>\r\n<span class=\"hljs-keyword\">import<\/span> <span class=\"hljs-string\">\"C\"<\/span>\r\n<\/code><\/pre>\n<p>\u6b21\u306b\u3001\u30aa\u30fc\u30c7\u30a3\u30aa\u30d5\u30a1\u30a4\u30eb\u3092\u8868\u73fe\u3059\u308b\u305f\u3081\u306e\u69cb\u9020\u4f53\u3092\u5b9a\u7fa9\u3057\u307e\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">type<\/span> Audio <span class=\"hljs-keyword\">struct<\/span> {\r\nFilename <span class=\"hljs-type\">string<\/span>\r\nFormat   *C.AVFormatContext\r\nCodec    *C.AVCodecContext\r\nStream   *C.AVStream\r\nFrame    *C.AVFrame\r\nSwsCtx   *C.SwsContext\r\n}\r\n<\/code><\/pre>\n<p>\u7d9a\u3044\u3066\u3001\u97f3\u58f0\u30d5\u30a1\u30a4\u30eb\u306e\u958b\u9589\u3092\u884c\u3046\u30d8\u30eb\u30d1\u30fc\u95a2\u6570\u7fa4\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">openAudio<\/span><span class=\"hljs-params\">(filename <span class=\"hljs-type\">string<\/span>)<\/span><\/span> (*Audio, <span class=\"hljs-type\">error<\/span>) {\r\naudio := &amp;Audio{Filename: filename}\r\n<span class=\"hljs-comment\">\/\/ \u6253\u5f00\u97f3\u9891\u6587\u4ef6<\/span>\r\n<span class=\"hljs-keyword\">if<\/span> ret := C.avformat_open_input(&amp;audio.Format, C.CString(filename), <span class=\"hljs-literal\">nil<\/span>, <span class=\"hljs-literal\">nil<\/span>); ret &lt; <span class=\"hljs-number\">0<\/span> {\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">nil<\/span>, fmt.Errorf(<span class=\"hljs-string\">\"could not open audio file: %s\"<\/span>, filename)\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u67e5\u627e\u97f3\u9891\u6d41<\/span>\r\n<span class=\"hljs-keyword\">if<\/span> ret := C.avformat_find_stream_info(audio.Format, <span class=\"hljs-literal\">nil<\/span>); ret &lt; <span class=\"hljs-number\">0<\/span> {\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">nil<\/span>, fmt.Errorf(<span class=\"hljs-string\">\"could not find audio stream in file: %s\"<\/span>, filename)\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u67e5\u627e\u97f3\u9891\u89e3\u7801\u5668<\/span>\r\ncodecID := C.av_find_best_stream(audio.Format, C.AVMEDIA_TYPE_AUDIO, <span class=\"hljs-number\">-1<\/span>, <span class=\"hljs-number\">-1<\/span>, <span class=\"hljs-literal\">nil<\/span>, <span class=\"hljs-number\">0<\/span>)\r\n<span class=\"hljs-keyword\">if<\/span> codecID &lt; <span class=\"hljs-number\">0<\/span> {\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">nil<\/span>, fmt.Errorf(<span class=\"hljs-string\">\"could not find audio codec for file: %s\"<\/span>, filename)\r\n}\r\naudio.Stream = audio.Format.streams[codecID]\r\n<span class=\"hljs-comment\">\/\/ \u67e5\u627e\u97f3\u9891\u89e3\u7801\u5668\u4e0a\u4e0b\u6587<\/span>\r\naudio.Codec = C.avcodec_alloc_context3(<span class=\"hljs-literal\">nil<\/span>)\r\n<span class=\"hljs-keyword\">if<\/span> ret := C.avcodec_parameters_to_context(audio.Codec, audio.Stream.codecpar); ret &lt; <span class=\"hljs-number\">0<\/span> {\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">nil<\/span>, fmt.Errorf(<span class=\"hljs-string\">\"could not allocate audio codec context for file: %s\"<\/span>, filename)\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u6253\u5f00\u97f3\u9891\u89e3\u7801\u5668<\/span>\r\n<span class=\"hljs-keyword\">if<\/span> ret := C.avcodec_open2(audio.Codec, <span class=\"hljs-literal\">nil<\/span>, <span class=\"hljs-literal\">nil<\/span>); ret &lt; <span class=\"hljs-number\">0<\/span> {\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">nil<\/span>, fmt.Errorf(<span class=\"hljs-string\">\"could not open audio codec for file: %s\"<\/span>, filename)\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u5206\u914d\u97f3\u9891\u5e27<\/span>\r\naudio.Frame = C.av_frame_alloc()\r\n<span class=\"hljs-keyword\">return<\/span> audio, <span class=\"hljs-literal\">nil<\/span>\r\n}\r\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">closeAudio<\/span><span class=\"hljs-params\">(audio *Audio)<\/span><\/span> {\r\nC.av_frame_free(&amp;audio.Frame)\r\nC.avcodec_free_context(&amp;audio.Codec)\r\nC.avformat_close_input(&amp;audio.Format)\r\n}\r\n<\/code><\/pre>\n<p>\u305d\u308d\u305d\u308d\u3001\u97f3\u58f0\u306e\u5408\u6210\u304a\u3088\u3073\u5206\u5272\u3092\u884c\u3046\u305f\u3081\u306e\u95a2\u6570\u3092\u5b9a\u7fa9\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-function\"><span class=\"hljs-keyword\">func<\/span> <span class=\"hljs-title\">composeAudio<\/span><span class=\"hljs-params\">(inputFilenames []<span class=\"hljs-type\">string<\/span>, outputFilename <span class=\"hljs-type\">string<\/span>)<\/span><\/span> <span class=\"hljs-type\">error<\/span> {\r\n<span class=\"hljs-comment\">\/\/ \u521b\u5efa\u8f93\u51fa\u97f3\u9891\u6587\u4ef6<\/span>\r\noutputFormat := C.av_guess_format(<span class=\"hljs-literal\">nil<\/span>, C.CString(outputFilename), <span class=\"hljs-literal\">nil<\/span>)\r\noutputAudio := &amp;Audio{Filename: outputFilename}\r\n<span class=\"hljs-keyword\">if<\/span> ret := C.avformat_alloc_output_context2(&amp;outputAudio.Format, outputFormat, <span class=\"hljs-literal\">nil<\/span>, <span class=\"hljs-literal\">nil<\/span>); ret &lt; <span class=\"hljs-number\">0<\/span> {\r\n<span class=\"hljs-keyword\">return<\/span> fmt.Errorf(<span class=\"hljs-string\">\"could not create output audio file: %s\"<\/span>, outputFilename)\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u6dfb\u52a0\u97f3\u9891\u6d41\u5230\u8f93\u51fa\u6587\u4ef6<\/span>\r\noutputAudio.Stream = C.avformat_new_stream(outputAudio.Format, <span class=\"hljs-literal\">nil<\/span>)\r\n<span class=\"hljs-keyword\">if<\/span> outputAudio.Stream == <span class=\"hljs-literal\">nil<\/span> {\r\n<span class=\"hljs-keyword\">return<\/span> fmt.Errorf(<span class=\"hljs-string\">\"could not create audio stream in output file: %s\"<\/span>, outputFilename)\r\n}\r\noutputAudio.Stream.codecpar.codec_id = inputAudio.Codec.codec_id\r\noutputAudio.Stream.codecpar.channel_layout = inputAudio.Codec.channel_layout\r\noutputAudio.Stream.codecpar.sample_rate = inputAudio.Codec.sample_rate\r\noutputAudio.Stream.codecpar.format = inputAudio.Codec.sample_fmt\r\n<span class=\"hljs-comment\">\/\/ \u6253\u5f00\u8f93\u51fa\u97f3\u9891\u6587\u4ef6<\/span>\r\n<span class=\"hljs-keyword\">if<\/span> ret := C.avio_open(&amp;outputAudio.Format.pb, C.CString(outputFilename), C.AVIO_WRONLY); ret &lt; <span class=\"hljs-number\">0<\/span> {\r\n<span class=\"hljs-keyword\">return<\/span> fmt.Errorf(<span class=\"hljs-string\">\"could not open output audio file: %s\"<\/span>, outputFilename)\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u5199\u5165\u6587\u4ef6\u5934<\/span>\r\n<span class=\"hljs-keyword\">if<\/span> ret := C.avformat_write_header(outputAudio.Format, <span class=\"hljs-literal\">nil<\/span>); ret &lt; <span class=\"hljs-number\">0<\/span> {\r\n<span class=\"hljs-keyword\">return<\/span> fmt.Errorf(<span class=\"hljs-string\">\"could not write output audio file header: %s\"<\/span>, outputFilename)\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u5904\u7406\u6bcf\u4e2a\u8f93\u5165\u97f3\u9891\u6587\u4ef6<\/span>\r\n<span class=\"hljs-keyword\">for<\/span> _, inputFilename := <span class=\"hljs-keyword\">range<\/span> inputFilenames {\r\ninputAudio,\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Go\u8a00\u8a9e\u3067\u306fCGo\u3092\u5229\u7528\u3057\u3066FFmpeg\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u547c\u3073\u51fa\u3057\u3001\u97f3\u58f0\u306e\u5408\u6210\u3084\u5206\u5272\u3092\u5b9f\u73fe\u3067\u304d\u308b\u3002 \u307e\u305a\u3001FFmpeg\u30e9\u30a4\u30d6\u30e9\u30ea\u304c\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u3001\u74b0\u5883\u5909\u6570\u306bFFmpeg\u306e\u30d1\u30b9\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002 Go\u30d5\u30a1\u30a4\u30eb\u3092 [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-123353","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Go\u3067FFmpeg\u3092\u4f7f\u7528\u3057\u3066\u30aa\u30fc\u30c7\u30a3\u30aa\u306e\u5408\u6210\u3068\u5206\u5272\u3092\u5b9f\u884c\u3059\u308b - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/go\u3067ffmpeg\u3092\u4f7f\u7528\u3057\u3066\u30aa\u30fc\u30c7\u30a3\u30aa\u306e\u5408\u6210\u3068\u5206\u5272\u3092\u5b9f\u884c\u3059\/\" \/>\n<meta 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content=\"https:\/\/www.silicloud.com\/ja\/blog\/go\u3067ffmpeg\u3092\u4f7f\u7528\u3057\u3066\u30aa\u30fc\u30c7\u30a3\u30aa\u306e\u5408\u6210\u3068\u5206\u5272\u3092\u5b9f\u884c\u3059\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-24T01:52:17+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-05T15:10:02+00:00\" \/>\n<meta name=\"author\" content=\"\u7dbe\u4e43, \u4e00\u5e0c\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u7dbe\u4e43, \u4e00\u5e0c\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"2\u5206\" \/>\n<script type=\"application\/ld+json\" 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