步骤如下：
1. 下载
官网永远是王道，呵呵：http://ffmpeg.org/download.html
或者 svn checkout svn://svn.mplayerhq.hu/ffmpeg/trunk ffmpeg
2. 编译
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运行./configure
很不幸，运行configure后出现了错误提示：
yasm not found, use –disable-yasm for a crippled build解决方案：sudo apt-getinstall yasm
重新./configure,搞定 -
make
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make install
权限不够需要前面加上sudo - 编译源码：一定注意加载库的顺序.
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- 参考代码：
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#include <SDL/SDL.h> #include <libavcodec/avcodec.h> #include <libavformat/avformat.h> #include <stdio.h> #include <libswscale/swscale.h> int main(int argc, char *argv[]) { AVFormatContext *pFormatCtx; int i, videoStream; AVCodecContext *pCodecCtx; AVCodec *pCodec; AVFrame *pFrame; AVFrame *pFrameYUV; AVPacket packet; int frameFinished; int numBytes; // Register all formats and codecs av_register_all(); // Open video file if (av_open_input_file(&pFormatCtx, "/home/user/workspace/panda/media/video/4f5a9c384d94eb21e5273ec263457535.mp4", NULL, 0, NULL ) != 0) { printf("=== cannot open file ==="); return -1; // Couldn't open file } // Retrieve stream information if (av_find_stream_info(pFormatCtx) < 0) return -1; // Couldn't find stream information // Dump information about file onto standard error // dump_format(pFormatCtx, 0, argv[1], false); // Find the first video stream videoStream = -1; for (i = 0; i < pFormatCtx->nb_streams; i++) if (pFormatCtx->streams[i]->codec->codec_type == CODEC_TYPE_VIDEO) //////// { videoStream = i; break; } if (videoStream == -1) return -1; // Didn't find a video stream // Get a pointer to the codec context for the video stream pCodecCtx = pFormatCtx->streams[videoStream]->codec; ////////// ///////// SDL initialization SDL_Surface *screen = SDL_SetVideoMode(pCodecCtx->width, pCodecCtx->height, 0, SDL_HWSURFACE); SDL_Overlay *overlay = SDL_CreateYUVOverlay(pCodecCtx->width, pCodecCtx->height, SDL_YV12_OVERLAY, screen); static SDL_Rect rect; rect.x = 0; rect.y = 0; rect.w = pCodecCtx->width; rect.h = pCodecCtx->height; ////////// // Find the decoder for the video stream pCodec = avcodec_find_decoder(pCodecCtx->codec_id); if (pCodec == NULL ) return -1; // Codec not found // Open codec if (avcodec_open(pCodecCtx, pCodec) < 0) return -1; // Could not open codec // Allocate video frame pFrame = avcodec_alloc_frame(); // Allocate an AVFrame structure pFrameYUV = avcodec_alloc_frame(); if (pFrameYUV == NULL ) return -1; static struct SwsContext *img_convert_ctx; img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, // PIX_FMT_RGB24, PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL ); // Set SDL events SDL_EventState(SDL_ACTIVEEVENT, SDL_IGNORE); SDL_EventState(SDL_MOUSEMOTION, SDL_IGNORE); SDL_ShowCursor(SDL_DISABLE); // Read frames while ((av_read_frame(pFormatCtx, &packet) >= 0) && (SDL_PollEvent(NULL ) == 0)) { // Is this a packet from the video stream? if (packet.stream_index == videoStream) { // Decode video frame avcodec_decode_video(pCodecCtx, pFrame, &frameFinished, packet.data, packet.size); // Did we get a video frame? if (frameFinished) { // Convert the image from its native format to YUV, and display SDL_LockYUVOverlay(overlay); pFrameYUV->data[0] = overlay->pixels[0]; pFrameYUV->data[1] = overlay->pixels[2]; pFrameYUV->data[2] = overlay->pixels[1]; pFrameYUV->linesize[0] = overlay->pitches[0]; pFrameYUV->linesize[1] = overlay->pitches[2]; pFrameYUV->linesize[2] = overlay->pitches[1]; // img_convert((AVPicture *) pFrameYUV, PIX_FMT_YUV420P, (AVPicture *) pFrame, pCodecCtx->pix_fmt, pCodecCtx->width, // pCodecCtx->height); // other codes // Convert the image from its native format to RGB sws_scale(img_convert_ctx, (const uint8_t* const *) pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize); SDL_UnlockYUVOverlay(overlay); SDL_DisplayYUVOverlay(overlay, &rect); /// SDL_Delay(30); } } // Free the packet that was allocated by av_read_frame av_free_packet(&packet); } // Free the RGB image av_free(pFrameYUV); // Free the YUV frame av_free(pFrame); // Close the codec avcodec_close(pCodecCtx); // Close the video file av_close_input_file(pFormatCtx); // SDL_FreeYUVOverlay(overlay); return 0; }
- 放大播放：
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#include <SDL/SDL.h> #include <libavcodec/avcodec.h> #include <libavformat/avformat.h> #include <stdio.h> #include <libswscale/swscale.h> int avcodec_main(int argc, char *argv[]) { AVFormatContext *pFormatCtx; int i, videoStream; AVCodecContext *pCodecCtx; AVCodec *pCodec; AVFrame *pFrame; AVFrame *pFrameYUV; AVPacket packet; int frameFinished; int numBytes; // Register all formats and codecs av_register_all(); // Open video file if (av_open_input_file(&pFormatCtx, "/home/user/workspace/panda/media/video/4f5a9c384d94eb21e5273ec263457535.mp4", NULL, 0, NULL ) != 0) { printf("=== cannot open file ==="); return -1; // Couldn't open file } // Retrieve stream information if (av_find_stream_info(pFormatCtx) < 0) return -1; // Couldn't find stream information // Dump information about file onto standard error // dump_format(pFormatCtx, 0, argv[1], false); // Find the first video stream videoStream = -1; for (i = 0; i < pFormatCtx->nb_streams; i++) if (pFormatCtx->streams[i]->codec->codec_type == CODEC_TYPE_VIDEO) //////// { videoStream = i; break; } if (videoStream == -1) return -1; // Didn't find a video stream // Get a pointer to the codec context for the video stream pCodecCtx = pFormatCtx->streams[videoStream]->codec; ////////// ///////// SDL initialization int w = 1920, h = 1080; SDL_Surface *screen = SDL_SetVideoMode(w, h, 0, SDL_HWSURFACE); SDL_Overlay *overlay = SDL_CreateYUVOverlay(w, h, SDL_YV12_OVERLAY, screen); static SDL_Rect rect; rect.x = 0; rect.y = 0; rect.w = w; rect.h = h; ////////// // Find the decoder for the video stream pCodec = avcodec_find_decoder(pCodecCtx->codec_id); if (pCodec == NULL ) return -1; // Codec not found // Open codec if (avcodec_open(pCodecCtx, pCodec) < 0) return -1; // Could not open codec // Allocate video frame pFrame = avcodec_alloc_frame(); // Allocate an AVFrame structure pFrameYUV = avcodec_alloc_frame(); if (pFrameYUV == NULL ) return -1; static struct SwsContext *img_convert_ctx; img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, w, h, // PIX_FMT_RGB24, PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL ); // Set SDL events SDL_EventState(SDL_ACTIVEEVENT, SDL_IGNORE); SDL_EventState(SDL_MOUSEMOTION, SDL_IGNORE); SDL_ShowCursor(SDL_DISABLE); // Read frames while ((av_read_frame(pFormatCtx, &packet) >= 0) && (SDL_PollEvent(NULL ) == 0)) { // Is this a packet from the video stream? if (packet.stream_index == videoStream) { // Decode video frame avcodec_decode_video(pCodecCtx, pFrame, &frameFinished, packet.data, packet.size); // Did we get a video frame? if (frameFinished) { // Convert the image from its native format to YUV, and display SDL_LockYUVOverlay(overlay); pFrameYUV->data[0] = overlay->pixels[0]; pFrameYUV->data[1] = overlay->pixels[2]; pFrameYUV->data[2] = overlay->pixels[1]; pFrameYUV->linesize[0] = overlay->pitches[0]; pFrameYUV->linesize[1] = overlay->pitches[2]; pFrameYUV->linesize[2] = overlay->pitches[1]; // img_convert((AVPicture *) pFrameYUV, PIX_FMT_YUV420P, (AVPicture *) pFrame, pCodecCtx->pix_fmt, pCodecCtx->width, // pCodecCtx->height); // other codes // Convert the image from its native format to RGB sws_scale(img_convert_ctx, (const uint8_t* const *) pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize); SDL_UnlockYUVOverlay(overlay); SDL_DisplayYUVOverlay(overlay, &rect); /// SDL_Delay(30); } } // Free the packet that was allocated by av_read_frame av_free_packet(&packet); } // Free the RGB image av_free(pFrameYUV); // Free the YUV frame av_free(pFrame); // Close the codec avcodec_close(pCodecCtx); // Close the video file av_close_input_file(pFormatCtx); // SDL_FreeYUVOverlay(overlay); return 0; } -
ffmpeg： http://blog.csdn.net/byxdaz/article/details/7316304
ffmpeg编译和使用大全 http://lvzun.iteye.com/blog/706121
- 重点推荐：http://dranger.com/ffmpeg/ An ffmpeg and SDL Tutorial
- http://www.libsdl.org/release/SDL-1.2.15/test/ SDL官方示例。 overlay有rgb转换到YUV.