├── CMakeLists.txt ├── LICENSE ├── README.md └── main.cpp /CMakeLists.txt: -------------------------------------------------------------------------------- 1 | 2 | cmake_minimum_required(VERSION 3.0) 3 | 4 | set(EXE OpenCV2FFmpeg) 5 | 6 | add_executable(${EXE} main.cpp) 7 | target_link_libraries(${EXE} opencv_imgproc opencv_highgui opencv_core swscale avutil avcodec avformat) 8 | 9 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. 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If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | 341 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Intro 2 | A sample code to grab frames from a video using OpenCV, and then to create a video by encoding these frames in H.264 using FFmpeg. 3 | 4 | # Build 5 | 6 | Steps for an out-of-source build. 7 | 8 | mkdir build 9 | cd build 10 | cmake .. 11 | make 12 | 13 | # Dependencies 14 | 15 | This code is dependent on, well, OpenCV and FFmpeg. Especially FFmpeg API seems to change a bit too often. Versions I used are, 16 | 17 | - libavutil 54. 27.100 18 | - libavcodec 56. 41.100 19 | - libavformat 56. 36.100 20 | - libavdevice 56. 4.100 21 | - libavfilter 5. 16.101 22 | - libavresample 2. 1. 0 23 | - libswscale 3. 1.101 24 | - libswresample 1. 2.100 25 | - libpostproc 53. 3.100 26 | 27 | And OpenCV 2.4.9. 28 | 29 | -------------------------------------------------------------------------------- /main.cpp: -------------------------------------------------------------------------------- 1 | //============================================================================ 2 | // Name : OpenCV2FFmpeg.cpp 3 | // Author : Baris Demiray 4 | // Version : 1.0.0 5 | // Copyright : GPL 6 | // Description : Sample application for cv::Mat to AVFrame conversion 7 | //============================================================================ 8 | 9 | #include 10 | #include 11 | #include 12 | 13 | #include 14 | #include 15 | #include 16 | 17 | extern "C" { 18 | #include 19 | #include 20 | #include 21 | #include 22 | } 23 | 24 | /** 25 | * Pixel formats and codecs 26 | */ 27 | static const AVPixelFormat sourcePixelFormat = AV_PIX_FMT_BGR24; 28 | static const AVPixelFormat destPixelFormat = AV_PIX_FMT_YUV420P; 29 | static const AVCodecID destCodec = AV_CODEC_ID_H264; 30 | 31 | 32 | int main(int argc, char** argv) 33 | { 34 | /** 35 | * Verify command line arguments 36 | */ 37 | if (argc != 4) { 38 | std::cout << "This tool grabs frames from and encodes a H.264 video with these at " << std::endl; 39 | std::cout << "Usage: " << argv[0] << " " << std::endl; 40 | std::cout << "Sample: " << argv[0] << "sample.mpg sample.out 250" << std::endl; 41 | exit(1); 42 | } 43 | 44 | std::string input(argv[1]), output(argv[2]); 45 | uint32_t framesToEncode; 46 | std::istringstream(argv[3]) >> framesToEncode; 47 | 48 | uint8_t endcode[] = { 0, 0, 1, 0xb7 }; 49 | 50 | /** 51 | * Create cv::Mat 52 | */ 53 | cv::VideoCapture videoCapturer(input); 54 | if (videoCapturer.isOpened() == false) { 55 | std::cerr << "Cannot open video at '" << input << "'" << std::endl; 56 | exit(1); 57 | } 58 | 59 | /** 60 | * Get some information of the video and print them 61 | */ 62 | double totalFrameCount = videoCapturer.get(CV_CAP_PROP_FRAME_COUNT); 63 | uint width = videoCapturer.get(CV_CAP_PROP_FRAME_WIDTH), 64 | height = videoCapturer.get(CV_CAP_PROP_FRAME_HEIGHT); 65 | 66 | std::cout << input << "[Width:" << width << ", Height=" << height 67 | << ", FPS: " << videoCapturer.get(CV_CAP_PROP_FPS) 68 | << ", FrameCount: " << totalFrameCount << "]" << std::endl; 69 | 70 | /** 71 | * Be sure we're not asking more frames than there is 72 | */ 73 | if (framesToEncode > totalFrameCount) { 74 | std::cerr << "You asked for " << framesToEncode << " but there are only " << totalFrameCount 75 | << " frames, will encode as many as there is" << std::endl; 76 | framesToEncode = totalFrameCount; 77 | } 78 | 79 | /** 80 | * Create an encoder and open it 81 | */ 82 | avcodec_register_all(); 83 | 84 | AVCodec *h264encoder = avcodec_find_encoder(destCodec); 85 | AVCodecContext *h264encoderContext = avcodec_alloc_context3(h264encoder); 86 | 87 | h264encoderContext->pix_fmt = destPixelFormat; 88 | h264encoderContext->width = width; 89 | h264encoderContext->height = height; 90 | 91 | if (avcodec_open2(h264encoderContext, h264encoder, NULL) < 0) { 92 | std::cerr << "Cannot open codec, exiting.." << std::endl; 93 | exit(1); 94 | } 95 | 96 | /** 97 | * Create a stream 98 | */ 99 | AVFormatContext *cv2avFormatContext = avformat_alloc_context(); 100 | AVStream *h264outputstream = avformat_new_stream(cv2avFormatContext, h264encoder); 101 | 102 | AVFrame *sourceAvFrame = av_frame_alloc(), *destAvFrame = av_frame_alloc(); 103 | int got_frame; 104 | 105 | FILE* videoOutFile = fopen(output.c_str(), "wb"); 106 | if (videoOutFile == 0) { 107 | std::cerr << "Cannot open output video file at '" << output << "'" << std::endl; 108 | exit(1); 109 | } 110 | 111 | /** 112 | * Prepare the conversion context 113 | */ 114 | SwsContext *bgr2yuvcontext = sws_getContext(width, height, sourcePixelFormat, 115 | width, height, destPixelFormat, 116 | SWS_BICUBIC, NULL, NULL, NULL); 117 | /** 118 | * Convert and encode frames 119 | */ 120 | for (uint i=0; i < framesToEncode; i++) { 121 | /** 122 | * Get frame from OpenCV 123 | */ 124 | cv::Mat cvFrame; 125 | assert(videoCapturer.read(cvFrame) == true); 126 | 127 | /** 128 | * Allocate source frame, i.e. input to sws_scale() 129 | */ 130 | av_image_alloc(sourceAvFrame->data, sourceAvFrame->linesize, width, height, sourcePixelFormat, 1); 131 | 132 | /** 133 | * Copy image data into AVFrame from cv::Mat 134 | */ 135 | for (uint32_t h = 0; h < height; h++) 136 | memcpy(&(sourceAvFrame->data[0][h*sourceAvFrame->linesize[0]]), &(cvFrame.data[h*cvFrame.step]), width*3); 137 | 138 | /** 139 | * Allocate destination frame, i.e. output from sws_scale() 140 | */ 141 | av_image_alloc(destAvFrame->data, destAvFrame->linesize, width, height, destPixelFormat, 1); 142 | 143 | sws_scale(bgr2yuvcontext, sourceAvFrame->data, sourceAvFrame->linesize, 144 | 0, height, destAvFrame->data, destAvFrame->linesize); 145 | sws_freeContext(bgr2yuvcontext); 146 | 147 | /** 148 | * Prepare an AVPacket and set buffer to NULL so that it'll be allocated by FFmpeg 149 | */ 150 | AVPacket avEncodedPacket; 151 | av_init_packet(&avEncodedPacket); 152 | avEncodedPacket.data = NULL; 153 | avEncodedPacket.size = 0; 154 | 155 | destAvFrame->pts = i; 156 | avcodec_encode_video2(h264encoderContext, &avEncodedPacket, destAvFrame, &got_frame); 157 | 158 | if (got_frame) { 159 | std::cerr << "Encoded a frame of size " << avEncodedPacket.size << ", writing it.." << std::endl; 160 | 161 | if (fwrite(avEncodedPacket.data, 1, avEncodedPacket.size, videoOutFile) < (unsigned)avEncodedPacket.size) 162 | std::cerr << "Could not write all " << avEncodedPacket.size << " bytes, but will continue.." << std::endl; 163 | 164 | fflush(videoOutFile); 165 | } 166 | 167 | /** 168 | * Per-frame cleanup 169 | */ 170 | av_packet_free_side_data(&avEncodedPacket); 171 | av_free_packet(&avEncodedPacket); 172 | av_freep(sourceAvFrame->data); 173 | av_frame_free(&sourceAvFrame); 174 | av_freep(destAvFrame->data); 175 | av_frame_free(&destAvFrame); 176 | } 177 | 178 | fwrite(endcode, 1, sizeof(endcode), videoOutFile); 179 | fclose(videoOutFile); 180 | 181 | /** 182 | * Final cleanup 183 | */ 184 | avformat_free_context(cv2avFormatContext); 185 | avcodec_close(h264encoderContext); 186 | avcodec_free_context(&h264encoderContext); 187 | } 188 | --------------------------------------------------------------------------------