mirror of https://github.com/davisking/dlib.git
117 lines
3.9 KiB
C++
117 lines
3.9 KiB
C++
// 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, in this case the encding API.
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This is a pretty simple example. It loads a video file, extracts the images and
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re-encodes them into a raw buffer using a user-specified codec.
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Please see the following examples on how to decode, demux, and get information on your installation of ffmpeg:
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- ffmpeg_info_ex.cpp
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- ffmpeg_video_decoding_ex.cpp
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- ffmpeg_video_decoding2_ex.cpp
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- ffmpeg_video_demuxing_ex.cpp
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- ffmpeg_video_demuxing2_ex.cpp
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*/
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#include <cstdio>
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#include <dlib/media.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("codec", "codec name. e.g. h264. Defaults to mpeg4", 1);
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parser.add_option("height", "height of encoded stream. Defaults to whatever is in the video file", 1);
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parser.add_option("width", "width of encoded stream. Defaults to whatever is in the video file", 1);
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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", "codec", "height", "width"};
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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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// Load input video.
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// Note, this uses a convenient constructor which (dis)enables audio and/or video.
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demuxer cap({filepath, video_enabled, audio_disabled});
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if (!cap.is_open() || !cap.video_enabled())
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{
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cout << "Failed to open " << filepath << endl;
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return EXIT_FAILURE;
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}
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// This is a small functor that creates an encoder using the command line arguments
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// and different types of output buffers using the convenient sink() overload.
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const auto make_encoder = [&]
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{
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return encoder([&] {
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encoder::args args;
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args.args_codec.codec_name = get_option(parser, "codec", "mpeg4");
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args.args_image.h = get_option(parser, "height", cap.height());
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args.args_image.w = get_option(parser, "width", cap.width());
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args.args_image.fmt = cap.pixel_fmt();
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args.args_image.framerate = cap.fps();
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return args;
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}());
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};
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// Encode to multiple different types of buffers.
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std::vector<char> buf1;
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std::vector<int8_t> buf2;
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std::vector<uint8_t> buf3;
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std::ostringstream buf4;
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std::ofstream buf5("encoded.dat", std::ios::binary);
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// Different encoders for different buffers
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auto enc1 = make_encoder();
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auto enc2 = make_encoder();
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auto enc3 = make_encoder();
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auto enc4 = make_encoder();
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auto enc5 = make_encoder();
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frame f;
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while (cap.read(f))
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{
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enc1.push(f, sink(buf1));
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enc2.push(f, sink(buf2));
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enc3.push(f, sink(buf3));
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enc4.push(f, sink(buf4));
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enc5.push(f, sink(buf5));
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}
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enc1.flush(sink(buf1));
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enc2.flush(sink(buf2));
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enc3.flush(sink(buf3));
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enc4.flush(sink(buf4));
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enc5.flush(sink(buf5));
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cout << "vector<char> size " << buf1.size() << endl;
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cout << "vector<int8_t> size " << buf2.size() << endl;
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cout << "vector<uint8_t> size " << buf3.size() << endl;
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cout << "ostringstream size " << buf4.tellp() << endl;
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cout << "ofstream size " << buf5.tellp() << endl;
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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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cout << e.what() << endl;
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return EXIT_FAILURE;
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} |