\u4e0a\u4e2a\u6708\u770b\u5b8c\u4e86\u8bb2H.264\u89c6\u9891\u7f16\u89e3\u7801\u7684\u7ecf\u5178\u4e66\uff1a\u201cThe H.264 Advanced Video Compression Standard\u201d\uff0c\u770b\u5b8c\u540e\u611f\u89c9\u4e5f\u4e0d\u662f\u90a3\u4e48\u96be\u3002\u8bb0\u5f97\u5927\u7ea6\u5341\u5e74\u524d\u7b2c\u4e00\u6b21\u770b\u5230\u9884\u6d4b(prediction), \u8fd0\u52a8\u8865\u507f(motion compensation)\u4e4b\u7c7b\u7684\u672f\u8bed\u548c\u793a\u610f\u56fe\uff0c\u611f\u89c9\u662f\u975e\u5e38\u6666\u6da9\u96be\u61c2\u7684\u77e5\u8bc6\u3002\u800c\u73b0\u5728\u8865\u4e86\u57fa\u7840\u4fe1\u53f7\u7406\u8bba\u7684\u77e5\u8bc6\uff0c\u4e5f\u626b\u9664\u4e86\u5f88\u591a\u754f\u96be\u5fc3\u7406\u3002<\/p>\n
\u540e\u6765\u4e86\u89e3\u5230\u6bd4\u8f83\u5e38\u7528\u7684\u5f00\u6e90H.264\u7f16\u7801\u5668\u662fX264\uff0c\u800cFFmpeg\u5219\u81ea\u5e26\u4e00\u4e2a\u5e7f\u6cdb\u4f7f\u7528\u7684\u5f00\u6e90H.264\u89e3\u7801\u5668\u3002\u4e8e\u662f\uff0c\u6211\u5c31\u60f3\u5bf9\u7167\u7740\u5f00\u6e90\u4ee3\u7801\uff0c\u518d\u8fc7\u4e00\u904d\u7406\u8bba\u77e5\u8bc6\u3002\u90a3\u5c31\u9009FFmpeg\u5427\uff5e\u6bd5\u7adf\u540d\u6c14\u592a\u5927\u3002<\/p>\n
\u9996\u5148\uff0c\u5f97\u7528FFmpeg\u6574\u4e00\u4e2a\u7b80\u5355\u7684\u64ad\u653e\u5668\u8dd1\u8d77\u6765\u624d\u80fd\u8c03\u8bd5\u3002\u4f46\u662f\uff0c\u7f51\u7edc\u4e0a\u867d\u7136\u6709\u5927\u91cfFFmpeg\u7f16\u5199\u7b80\u5355\u64ad\u653e\u5668\u7684\u4ee3\u7801\uff0c\u7edd\u5927\u90e8\u5206\u4ee3\u7801\u5374\u662f\u65e0\u6cd5\u7528\u6700\u65b0\u7684FFmpeg\u901a\u8fc7\u7f16\u8bd1\u7684\u3002\u6bd5\u7adfFFmpeg\u5728\u6301\u7eed\u5f00\u53d1\u4e2d\uff0c\u8fde\u4e0a\u5c42API\u4e5f\u4f1a\u6709\u53d8\u5316\u3002\u6211\u4e0b\u8f7d\u4e86\u76ee\u524d(2022\/Feb\/13)\u6700\u65b0\u7684\u4ee3\u7801\uff0c\u7248\u672c\u53f7\u662f5.0\u3002\u65e7FFmpeg\u64ad\u653e\u5668\u4ee3\u7801\u8dd1\u4e0d\u8d77\u6765\u3002<\/p>\n
\u597d\u5728\u6211\u5728youtube.com\u4e0a\u627e\u5230\u4e00\u4f4dFFmpeg\u6838\u5fc3\u7ef4\u62a4\u8005Matt Szatmary\u505a\u7684presentation\uff0cAn Introduction to Building tools with FFmpeg libraries and APIs – Matt Szatmary | August 2019<\/a>\uff0c\u7ed3\u5408\u5b83\u7684\u4ecb\u7ecd\uff0c\u628a\u7b80\u5355\u7684\u64ad\u653e\u529f\u80fd\u8dd1\u8d77\u6765\u4e86\u3002\u8fd9\u91cc\u6709\u4e2a\u5c0f\u9057\u61be\u6ca1\u80fd\u627e\u5230Matt Szatmary\u7684\u6e90\u4ee3\u7801\uff0c\u867d\u7136\u4ed6\u5728\u89c6\u9891\u4e2d\u8bf4\u662f\u5f00\u6e90\u7684\u3002\u672c\u6765\u8fd8\u60f3\u5b66\u4e60\u4e00\u4e0b\u5927\u4f6c\u7684\u5199\u6cd5\u3002<\/p>\n \u4ee3\u7801\u8d34\u5728\u8fd9\u91cc\u3002\u7528\u8fd9\u4e2a\u5c0fDEMO\u53ef\u4ee5\u7528\u8c03\u8bd5\u5668\u8ddf\u5230FFmpeg\u7684\u4ee3\u7801\u91cc\u770bH264\u89e3\u7801\u5668\u7684\u5177\u4f53\u5b9e\u73b0\u4e86\u3002<\/p>\n \u4e0a\u4e2a\u6708\u770b\u5b8c\u4e86\u8bb2H.264\u89c6\u9891\u7f16\u89e3\u7801\u7684\u7ecf\u5178\u4e66\uff1a\u201cThe H.264 Advanced Video Compression Standard\u201d\uff0c\u770b\u5b8c\u540e\u611f\u89c9\u4e5f\u4e0d\u662f\u90a3\u4e48\u96be\u3002\u8bb0\u5f97\u5927\u7ea6\u5341\u5e74\u524d\u7b2c\u4e00\u6b21\u770b\u5230\u9884\u6d4b(prediction), \u8fd0\u52a8\u8865\u507f(motion compensation)\u4e4b\u7c7b\u7684\u672f\u8bed\u548c\u793a\u610f\u56fe\uff0c\u611f\u89c9\u662f\u975e\u5e38\u6666\u6da9\u96be\u61c2\u7684\u77e5\u8bc6\u3002\u800c\u73b0\u5728\u8865\u4e86\u57fa\u7840\u4fe1\u53f7\u7406\u8bba\u7684\u77e5\u8bc6\uff0c\u4e5f\u626b\u9664\u4e86\u5f88\u591a\u754f\u96be\u5fc3\u7406\u3002 \u540e\u6765\u4e86\u89e3\u5230\u6bd4\u8f83\u5e38\u7528\u7684\u5f00\u6e90H.264\u7f16\u7801\u5668\u662fX264\uff0c\u800cFFmpeg\u5219\u81ea\u5e26\u4e00\u4e2a\u5e7f\u6cdb\u4f7f\u7528\u7684\u5f00\u6e90H.264\u89e3\u7801\u5668\u3002\u4e8e\u662f\uff0c\u6211\u5c31\u60f3\u5bf9\u7167\u7740\u5f00\u6e90\u4ee3\u7801\uff0c\u518d\u8fc7\u4e00\u904d\u7406\u8bba\u77e5\u8bc6\u3002\u90a3\u5c31\u9009FFmpeg\u5427\uff5e\u6bd5\u7adf\u540d\u6c14\u592a\u5927\u3002 \u9996\u5148\uff0c\u5f97\u7528FFmpeg\u6574\u4e00\u4e2a\u7b80\u5355\u7684\u64ad\u653e\u5668\u8dd1\u8d77\u6765\u624d\u80fd\u8c03\u8bd5\u3002\u4f46\u662f\uff0c\u7f51\u7edc\u4e0a\u867d\u7136\u6709\u5927\u91cfFFmpeg\u7f16\u5199\u7b80\u5355\u64ad\u653e\u5668\u7684\u4ee3\u7801\uff0c\u7edd\u5927\u90e8\u5206\u4ee3\u7801\u5374\u662f\u65e0\u6cd5\u7528\u6700\u65b0\u7684FFmpeg\u901a\u8fc7\u7f16\u8bd1\u7684\u3002\u6bd5\u7adfFFmpeg\u5728\u6301\u7eed\u5f00\u53d1\u4e2d\uff0c\u8fde\u4e0a\u5c42API\u4e5f\u4f1a\u6709\u53d8\u5316\u3002\u6211\u4e0b\u8f7d\u4e86\u76ee\u524d(2022\/Feb\/13)\u6700\u65b0\u7684\u4ee3\u7801\uff0c\u7248\u672c\u53f7\u662f5.0\u3002\u65e7FFmpeg\u64ad\u653e\u5668\u4ee3\u7801\u8dd1\u4e0d\u8d77\u6765\u3002 \u597d\u5728\u6211\u5728youtube.com\u4e0a\u627e\u5230\u4e00\u4f4dFFmpeg\u6838\u5fc3\u7ef4\u62a4\u8005Matt Szatmary\u505a\u7684presentation\uff0cAn Introduction to Building tools with FFmpeg libraries and APIs – Matt Szatmary | August 2019\uff0c\u7ed3\u5408\u5b83\u7684\u4ecb\u7ecd\uff0c\u628a\u7b80\u5355\u7684\u64ad\u653e\u529f\u80fd\u8dd1\u8d77\u6765\u4e86\u3002\u8fd9\u91cc\u6709\u4e2a\u5c0f\u9057\u61be\u6ca1\u80fd\u627e\u5230Matt Szatmary\u7684\u6e90\u4ee3\u7801\uff0c\u867d\u7136\u4ed6\u5728\u89c6\u9891\u4e2d\u8bf4\u662f\u5f00\u6e90\u7684\u3002\u672c\u6765\u8fd8\u60f3\u5b66\u4e60\u4e00\u4e0b\u5927\u4f6c\u7684\u5199\u6cd5\u3002 \u4ee3\u7801\u8d34\u5728\u8fd9\u91cc\u3002\u7528\u8fd9\u4e2a\u5c0fDEMO\u53ef\u4ee5\u7528\u8c03\u8bd5\u5668\u8ddf\u5230FFmpeg\u7684\u4ee3\u7801\u91cc\u770bH264\u89e3\u7801\u5668\u7684\u5177\u4f53\u5b9e\u73b0\u4e86\u3002 #include <stdio.h> #define __STDC_CONSTANT_MACROS \/\/ Linux… #ifdef __cplusplus extern “C” { #endif #include <libavcodec\/avcodec.h> #include <libavformat\/avformat.h> #include <libswscale\/swscale.h> #include <libavutil\/imgutils.h> #include <SDL2\/SDL.h> #ifdef __cplusplus }; #endif … Continue reading “\u7528FFmpeg5.0 + SDL3 \u64ad\u653e\u89c6\u9891”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-1755","post","type-post","status-publish","format-standard","hentry","category-tech_articles"],"_links":{"self":[{"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/posts\/1755","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ykyi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1755"}],"version-history":[{"count":0,"href":"https:\/\/ykyi.net\/index.php?rest_route=\/wp\/v2\/posts\/1755\/revisions"}],"wp:attachment":[{"href":"https:\/\/ykyi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1755"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ykyi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1755"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ykyi.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1755"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}#include <stdio.h>\n#define __STDC_CONSTANT_MACROS\n\/\/ Linux...\n#ifdef __cplusplus\nextern \"C\"\n{\n#endif\n#include <libavcodec\/avcodec.h>\n#include <libavformat\/avformat.h>\n#include <libswscale\/swscale.h>\n#include <libavutil\/imgutils.h>\n#include <SDL2\/SDL.h>\n#ifdef __cplusplus\n};\n#endif\n\nint sfp_refresh_thread(void *opaque);\n\n\/\/ Refresh Event\n#define SFM_REFRESH_EVENT (SDL_USEREVENT + 1)\n#define SFM_BREAK_EVENT (SDL_USEREVENT + 2)\nint thread_exit = 0;\nint thread_pause = 0;\n\nint sfp_refresh_thread(void *opaque)\n{\n SDL_Event event;\n\n thread_exit = 0;\n thread_pause = 0;\n while (!thread_exit)\n {\n if (!thread_pause)\n {\n SDL_Event event;\n event.type = SFM_REFRESH_EVENT;\n SDL_PushEvent(&event);\n }\n SDL_Delay(40);\n }\n thread_exit = 0;\n thread_pause = 0;\n \/\/ Break\n event.type = SFM_BREAK_EVENT;\n SDL_PushEvent(&event);\n return 0;\n}\n\nint main(int argc, char *argv[])\n{\n AVFormatContext *pFormatCtx;\n int i, videoindex;\n AVCodecParameters *pCodecPar;\n AVCodecContext *pCodecCtx;\n const AVCodec *pCodec;\n AVFrame *pFrame, *pFrameYUV;\n unsigned char *out_buffer;\n AVPacket *packet;\n int ret, got_picture;\n \/\/------------SDL----------------\n int screen_w, screen_h;\n SDL_Window *screen;\n SDL_Renderer *sdlRenderer;\n SDL_Texture *sdlTexture;\n SDL_Rect sdlRect;\n SDL_Thread *video_tid;\n SDL_Event event;\n struct SwsContext *img_convert_ctx;\n char filepath[] = \"video\";\n\n \/\/ avformat_network_init();\n \/\/ pFormatCtx = avformat_alloc_context();\n pFormatCtx = NULL; \/\/ MYNOTE: if pFormatCtx is not allocated explicitly using avformat_alloc_context()\n \/\/ pFormatCtx will be allocated implicitly in avformat_open_input.\n if (avformat_open_input(&pFormatCtx, filepath, NULL, NULL) != 0)\n {\n printf(\"Couldn't open input stream.\\n\");\n return -1;\n }\n if (avformat_find_stream_info(pFormatCtx, NULL) < 0)\n {\n printf(\"Couldn't find stream information.\\n\");\n return -1;\n }\n videoindex = -1;\n for (i = 0; i < pFormatCtx->nb_streams; i++)\n if (pFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)\n {\n videoindex = i;\n pCodecPar = pFormatCtx->streams[i]->codecpar;\n break;\n }\n if (videoindex == -1)\n {\n printf(\"Didn't find a video stream.\\n\");\n return -1;\n }\n\n pCodec = avcodec_find_decoder(pCodecPar->codec_id);\n if (pCodec == NULL)\n {\n printf(\"Codec not found.\\n\");\n return -1;\n }\n pCodecCtx = avcodec_alloc_context3(pCodec);\n if (!pCodecCtx)\n {\n fprintf(stderr, \"Could not allocate video codec context\\n\");\n exit(1);\n }\n \/\/ \u8fd9\u4e00\u6b65\u4e0d\u80fd\u5c11\uff0c\u5426\u5219\u4f1a\u5d29\u6e83\u3002\u628aCodecPar\u7684\u53c2\u6570\u518d\u590d\u5236\u5230codecCtx\u4e2d\n ret = avcodec_parameters_to_context(pCodecCtx, pCodecPar);\n if (ret < 0)\n {\n printf(\"avcodec_parameters_to_context failed...\");\n return -1;\n }\n \/\/ pCodecCtx = pFormatCtx->streams[videoindex]->codecpar;\n if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0)\n {\n printf(\"Could not open codec.\\n\");\n return -1;\n }\n pFrame = av_frame_alloc();\n pFrameYUV = av_frame_alloc();\n size_t sz = av_image_get_buffer_size(AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height, 1);\n out_buffer = (unsigned char *)av_malloc(sz);\n av_image_fill_arrays(pFrameYUV->data, pFrameYUV->linesize, out_buffer,\n AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height, 1);\n \/\/ Output Info-----------------------------\n printf(\"---------------- File Information ---------------\\n\");\n av_dump_format(pFormatCtx, 0, filepath, 0);\n printf(\"-------------------------------------------------\\n\");\n img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt,\n pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_YUV420P,\n SWS_BICUBIC, NULL, NULL, NULL);\n if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO |\n SDL_INIT_TIMER))\n {\n printf(\"Could not initialize SDL - %s\\n\", SDL_GetError());\n return -1;\n }\n \/\/ SDL 2.0 Support for multiple windows\n screen_w = pCodecCtx->width;\n screen_h = pCodecCtx->height;\n screen = SDL_CreateWindow(\"Simplest ffmpeg player's Window\",\n SDL_WINDOWPOS_UNDEFINED,\n SDL_WINDOWPOS_UNDEFINED,\n screen_w, screen_h, SDL_WINDOW_OPENGL);\n if (!screen)\n {\n printf(\"SDL: could not create window - exiting:%s\\n\", SDL_GetError());\n return -1;\n }\n sdlRenderer = SDL_CreateRenderer(screen, -1, 0);\n \/\/ IYUV: Y + U + V (3 planes)\n \/\/ YV12: Y + V + U (3 planes)\n sdlTexture = SDL_CreateTexture(sdlRenderer,\n SDL_PIXELFORMAT_IYUV,\n SDL_TEXTUREACCESS_STREAMING, pCodecCtx->width, pCodecCtx->height);\n sdlRect.x = 0;\n sdlRect.y = 0;\n sdlRect.w = screen_w;\n sdlRect.h = screen_h;\n packet = (AVPacket *)av_malloc(sizeof(AVPacket));\n video_tid = SDL_CreateThread(sfp_refresh_thread, NULL, NULL);\n \/\/------------SDL End------------\n \/\/ Event Loop\n for (;;)\n {\n char buf[1024];\n int ret;\n \/\/ Wait\n SDL_WaitEvent(&event);\n if (event.type == SFM_REFRESH_EVENT)\n {\n while (1)\n {\n if (av_read_frame(pFormatCtx, packet) < 0)\n thread_exit = 1;\n if (packet->stream_index == videoindex)\n break;\n }\n\n \/\/ ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);\n \/\/ ret = my_decode();\n ret = avcodec_send_packet(pCodecCtx, packet);\n if (ret < 0)\n {\n fprintf(stderr, \"Error sending a packet for decoding\\n\");\n exit(1);\n }\n\n while (ret >= 0)\n {\n ret = avcodec_receive_frame(pCodecCtx, pFrame);\n if (ret == AVERROR(EAGAIN))\n {\n fprintf(stderr, \"EAGAIN occurred...\\n\");\n break;\n }\n if (ret == AVERROR_EOF)\n {\n printf(\"byebye...\\n\");\n exit(0);\n }\n if (ret < 0)\n {\n fprintf(stderr, \"Error during decoding\\n\");\n exit(1);\n }\n\n printf(\"Got frame %3d\\n\", pCodecCtx->frame_number);\n fflush(stdout);\n\n \/* the picture is allocated by the decoder. no need to\n free it *\/\n \/\/ snprintf(buf, sizeof(buf), \"%s-%d\", \"player.c\", dec_ctx->frame_number);\n \/\/ pgm_save(frame->data[0], frame->linesize[0], frame->width, frame->height, buf);\n\n sws_scale(img_convert_ctx, (const unsigned char *const *)pFrame->data,\n pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);\n \/\/ SDL---------------------------\n SDL_UpdateTexture(sdlTexture, NULL, pFrameYUV->data[0],\n pFrameYUV->linesize[0]);\n SDL_RenderClear(sdlRenderer);\n SDL_RenderCopy(sdlRenderer, sdlTexture, NULL, NULL);\n SDL_RenderPresent(sdlRenderer);\n \/\/ SDL End-----------------------\n }\n\n \/\/ av_free_packet(packet);\n av_packet_unref(packet);\n }\n else if (event.type == SDL_KEYDOWN)\n {\n \/\/ Pause\n if (event.key.keysym.sym == SDLK_SPACE)\n thread_pause = !thread_pause;\n }\n else if (event.type == SDL_QUIT)\n {\n thread_exit = 1;\n }\n else if (event.type == SFM_BREAK_EVENT)\n {\n break;\n }\n }\n sws_freeContext(img_convert_ctx);\n SDL_Quit();\n av_frame_free(&pFrameYUV);\n av_frame_free(&pFrame);\n avcodec_free_context(&pCodecCtx);\n avcodec_close(pCodecCtx);\n avformat_close_input(&pFormatCtx);\n\n return 0;\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"