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106 lines
3.7 KiB
106 lines
3.7 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, in this case the muxing API.
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This is a pretty simple example. It loads a video file, extracts images and audio frames (if present) and
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re-encodes them into a video file.
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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("o", "output file", 1);
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parser.add_option("codec_video", "video codec name. e.g. `h264`", 1);
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parser.add_option("codec_audio", "audio codec name. e.g. `aac`", 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.add_option("sample_rate", "sample rate 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", "o", "codec_video", "codec_audio", "height", "width", "sample_rate"};
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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 input_filepath = parser.option("i").argument();
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const std::string output_filepath = parser.option("o").argument();
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demuxer cap(input_filepath);
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if (!cap.is_open())
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{
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cout << "Failed to open " << input_filepath << endl;
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return EXIT_FAILURE;
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}
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muxer writer([&] {
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muxer::args args;
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args.filepath = output_filepath;
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args.enable_image = cap.video_enabled();
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args.enable_audio = cap.audio_enabled();
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if (args.enable_image)
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{
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args.args_image.codec_name = get_option(parser, "codec_video", "");;
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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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}
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if (args.enable_audio)
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{
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args.args_audio.codec_name = get_option(parser, "codec_audio", "");;
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args.args_audio.sample_rate = get_option(parser, "sample_rate", cap.sample_rate());
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args.args_audio.channel_layout = cap.channel_layout();
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args.args_audio.fmt = cap.sample_fmt();
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}
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return args;
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}());
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if (!writer.is_open())
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{
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cout << "Failed to open " << output_filepath << endl;
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return EXIT_FAILURE;
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}
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frame f;
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while (cap.read(f))
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writer.push(std::move(f));
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// writer.flush();
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// You don't have to call flush() here because it's called in the destructor of muxer
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// If you call it more than once, it becomes a no-op basically.
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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() << '\n';
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return EXIT_FAILURE;
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}
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