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84 lines
2.4 KiB
84 lines
2.4 KiB
// The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt
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/*
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This is an example illustrating the use of the ffmpeg wrappers,
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in this case the demuxer API.
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In this example, we show how to read both images and audio.
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*/
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#include <cstdio>
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#include <dlib/media.h>
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#include <dlib/gui_widgets.h>
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#include <dlib/cmd_line_parser.h>
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using namespace std;
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using namespace dlib;
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using namespace dlib::ffmpeg;
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int main(const int argc, const char** argv)
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try
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{
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command_line_parser parser;
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parser.add_option("i", "input video", 1);
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parser.add_option("verbose", "enable all internal ffmpeg logging");
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parser.set_group_name("Help Options");
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parser.add_option("h", "alias of --help");
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parser.add_option("help", "display this message and exit");
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parser.parse(argc, argv);
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const char* one_time_opts[] = {"i"};
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parser.check_one_time_options(one_time_opts);
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if (parser.option("h") || parser.option("help"))
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{
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parser.print_options();
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return 0;
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}
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const std::string filepath = parser.option("i").argument();
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// We use the most simple constructor, the one that takes in filepath.
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// By default, both images and audio are read.
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demuxer cap(filepath);
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if (!cap.is_open())
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{
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printf("%s is not a valid video file\n", filepath.c_str());
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return EXIT_FAILURE;
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}
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// Read images and audio.
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// Images are plotted, audio samples are counted.
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frame f;
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array2d<rgb_pixel> img;
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image_window win;
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int nsamples{0};
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// When reading frames, we get exactly what's in the codec by default.
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// To resize, change pixel format, resample or change sample format,
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// you have to pass extra arguments to read() which either resize or resample
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// the frame. Since we want rgb_pixel, we need to set the pixel format appropriately.
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const resizing_args args_image {0, 0, pix_traits<rgb_pixel>::fmt};
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while (cap.read(f, args_image))
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{
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if (f.is_image())
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{
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convert(f, img);
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win.set_image(img);
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}
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else if (f.is_audio())
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{
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nsamples += f.nsamples();
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}
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}
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printf("Read %i audio samples\n", nsamples);
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return EXIT_SUCCESS;
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}
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catch (const std::exception& e)
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{
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printf("%s\n", e.what());
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return EXIT_FAILURE;
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} |