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Merge pull request #11804 from mshabunin:gst-sample

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pull/11849/head
Vadim Pisarevsky 6 years ago
parent 75ee536d6d fe20fa8326
commit db48f7b5d1
1 changed files with 301 additions and 372 deletions
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  1. 673
      samples/cpp/gstreamer_pipeline.cpp

673
samples/cpp/gstreamer_pipeline.cpp
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@ -4,444 +4,373 @@
#include "opencv2/highgui.hpp"
#include <string>
#include <iostream>
#include <map>
using namespace std;
using namespace cv;
class GStreamerPipeline
//================================================================================
template<typename M>
inline typename M::mapped_type getValue(const M &dict, const typename M::key_type &key, const string & errorMessage)
{
public:
// Preprocessing arguments command line
GStreamerPipeline(int argc, char *argv[])
typename M::const_iterator it = dict.find(key);
if (it == dict.end())
{
const string keys =
"{h help usage ? | | print help messages }"
"{m mode | | coding mode (supported: encode, decode) }"
"{p pipeline |default | pipeline name (supported: 'default', 'gst-basic', 'gst-vaapi', 'gst-libav', 'ffmpeg') }"
"{cd codec |h264 | codec name (supported: 'h264', 'h265', 'mpeg2', 'mpeg4', 'mjpeg', 'vp8') }"
"{f file path | | path to file }"
"{vr resolution |720p | video resolution for encoding (supported: '720p', '1080p', '4k') }"
"{fps |30 | fix frame per second for encoding (supported: fps > 0) }"
"{fm fast | | fast measure fps }";
cmd_parser = new CommandLineParser(argc, argv, keys);
cmd_parser->about("This program shows how to read a video file with GStreamer pipeline with OpenCV.");
CV_Error(Error::StsBadArg, errorMessage);
}
return it->second;
}
if (cmd_parser->has("help"))
{
cmd_parser->printMessage();
CV_Error(Error::StsBadArg, "Called help.");
}
inline map<string, Size> sizeByResolution()
{
map<string, Size> res;
res["720p"] = Size(1280, 720);
res["1080p"] = Size(1920, 1080);
res["4k"] = Size(3840, 2160);
return res;
}
fast_measure = cmd_parser->has("fast"); // fast measure fps
fix_fps = cmd_parser->get<int>("fps"); // fixed frame per second
pipeline = cmd_parser->get<string>("pipeline"), // gstreamer pipeline type
mode = cmd_parser->get<string>("mode"), // coding mode
codec = cmd_parser->get<string>("codec"), // codec type
file_name = cmd_parser->get<string>("file"), // path to videofile
resolution = cmd_parser->get<string>("resolution"); // video resolution
inline map<string, int> fourccByCodec()
{
map<string, int> res;
res["h264"] = VideoWriter::fourcc('H','2','6','4');
res["h265"] = VideoWriter::fourcc('H','E','V','C');
res["mpeg2"] = VideoWriter::fourcc('M','P','E','G');
res["mpeg4"] = VideoWriter::fourcc('M','P','4','2');
res["mjpeg"] = VideoWriter::fourcc('M','J','P','G');
res["vp8"] = VideoWriter::fourcc('V','P','8','0');
return res;
}
size_t found = file_name.rfind(".");
if (found != string::npos)
{
container = file_name.substr(found + 1); // container type
}
else { CV_Error(Error::StsBadArg, "Can not parse container extension."); }
inline map<string, string> defaultEncodeElementByCodec()
{
map<string, string> res;
res["h264"] = "x264enc";
res["h265"] = "x265enc";
res["mpeg2"] = "mpeg2enc";
res["mjpeg"] = "jpegenc";
res["vp8"] = "vp8enc";
return res;
}
if (!cmd_parser->check())
{
cmd_parser->printErrors();
CV_Error(Error::StsBadArg, "Failed parse arguments.");
}
}
inline map<string, string> VAAPIEncodeElementByCodec()
{
map<string, string> res;
res["h264"] = "parsebin ! vaapih264enc";
res["h265"] = "parsebin ! vaapih265enc";
res["mpeg2"] = "parsebin ! vaapimpeg2enc";
res["mjpeg"] = "parsebin ! vaapijpegenc";
res["vp8"] = "parsebin ! vaapivp8enc";
return res;
}
~GStreamerPipeline() { delete cmd_parser; }
inline map<string, string> mfxDecodeElementByCodec()
{
map<string, string> res;
res["h264"] = "parsebin ! mfxh264dec";
res["h265"] = "parsebin ! mfxhevcdec";
res["mpeg2"] = "parsebin ! mfxmpeg2dec";
res["mjpeg"] = "parsebin ! mfxjpegdec";
return res;
}
// Start pipeline
int run()
{
if (mode == "decode") { if (createDecodePipeline() < 0) return -1; }
else if (mode == "encode") { if (createEncodePipeline() < 0) return -1; }
else
{
cout << "Unsupported mode: " << mode << endl;
cmd_parser->printErrors();
return -1;
}
cout << "_____________________________________" << endl;
cout << "Pipeline " << mode << ":" << endl;
cout << stream_pipeline.str() << endl;
// Choose a show video or only measure fps
cout << "_____________________________________" << endl;
cout << "Start measure frame per seconds (fps)" << endl;
cout << "Loading ..." << endl;
inline map<string, string> mfxEncodeElementByCodec()
{
map<string, string> res;
res["h264"] = "mfxh264enc";
res["h265"] = "mfxhevcenc";
res["mpeg2"] = "mfxmpeg2enc";
res["mjpeg"] = "mfxjpegenc";
return res;
}
vector<double> tick_counts;
inline map<string, string> libavDecodeElementByCodec()
{
map<string, string> res;
res["h264"] = "parsebin ! avdec_h264";
res["h265"] = "parsebin ! avdec_h265";
res["mpeg2"] = "parsebin ! avdec_mpeg2video";
res["mpeg4"] = "parsebin ! avdec_mpeg4";
res["mjpeg"] = "parsebin ! avdec_mjpeg";
res["vp8"] = "parsebin ! avdec_vp8";
return res;
}
cout << "Start " << mode << ": " << file_name;
cout << " (" << pipeline << ")" << endl;
inline map<string, string> libavEncodeElementByCodec()
{
map<string, string> res;
res["h264"] = "avenc_h264";
res["h265"] = "avenc_h265";
res["mpeg2"] = "avenc_mpeg2video";
res["mpeg4"] = "avenc_mpeg4";
res["mjpeg"] = "avenc_mjpeg";
res["vp8"] = "avenc_vp8";
return res;
}
while(true)
{
int64 temp_count_tick = 0;
if (mode == "decode")
{
Mat frame;
temp_count_tick = getTickCount();
cap >> frame;
temp_count_tick = getTickCount() - temp_count_tick;
if (frame.empty()) { break; }
}
else if (mode == "encode")
{
Mat element;
while(!cap.grab());
cap.retrieve(element);
temp_count_tick = getTickCount();
wrt << element;
temp_count_tick = getTickCount() - temp_count_tick;
}
inline map<string, string> demuxPluginByContainer()
{
map<string, string> res;
res["avi"] = "avidemux";
res["mp4"] = "qtdemux";
res["mov"] = "qtdemux";
res["mkv"] = "matroskademux";
return res;
}
tick_counts.push_back(static_cast<double>(temp_count_tick));
if (((mode == "decode") && fast_measure && (tick_counts.size() > 1e3)) ||
((mode == "encode") && (tick_counts.size() > 3e3)) ||
((mode == "encode") && fast_measure && (tick_counts.size() > 1e2)))
{ break; }
inline map<string, string> muxPluginByContainer()
{
map<string, string> res;
res["avi"] = "avimux";
res["mp4"] = "qtmux";
res["mov"] = "qtmux";
res["mkv"] = "matroskamux";
return res;
}
}
double time_fps = sum(tick_counts)[0] / getTickFrequency();
//================================================================================
if (tick_counts.size() != 0)
{
cout << "Finished: " << tick_counts.size() << " in " << time_fps <<" sec ~ " ;
cout << tick_counts.size() / time_fps <<" fps " << endl;
}
else
{
cout << "Failed " << mode << ": " << file_name;
cout << " (" << pipeline << ")" << endl;
return -1;
}
return 0;
inline string containerByName(const string &name)
{
size_t found = name.rfind(".");
if (found != string::npos)
{
return name.substr(found + 1); // container type
}
return string();
}
//================================================================================
// Free video resource
void close()
inline Ptr<VideoCapture> createCapture(const string &backend, const string &file_name, const string &codec)
{
if (backend == "gst-default")
{
cap.release();
wrt.release();
cout << "Created GStreamer capture ( " << file_name << " )" << endl;
return makePtr<VideoCapture>(file_name, CAP_GSTREAMER);
}
private:
// Choose the constructed GStreamer pipeline for decode
int createDecodePipeline()
else if (backend.find("gst") == 0)
{
if (pipeline == "default") {
cap = VideoCapture(file_name, CAP_GSTREAMER);
}
else if (pipeline.find("gst") == 0)
{
stream_pipeline << "filesrc location=\"" << file_name << "\"";
stream_pipeline << " ! " << getGstMuxPlugin();
if (pipeline.find("basic") == 4)
{
stream_pipeline << getGstDefaultCodePlugin();
}
else if (pipeline.find("vaapi1710") == 4)
{
stream_pipeline << getGstVaapiCodePlugin();
}
else if (pipeline.find("libav") == 4)
{
stream_pipeline << getGstAvCodePlugin();
}
else
{
cout << "Unsupported pipeline: " << pipeline << endl;
cmd_parser->printErrors();
return -1;
}
stream_pipeline << " ! videoconvert n-threads=" << getNumThreads();
stream_pipeline << " ! appsink sync=false";
cap = VideoCapture(stream_pipeline.str(), CAP_GSTREAMER);
}
else if (pipeline == "ffmpeg")
{
cap = VideoCapture(file_name, CAP_FFMPEG);
stream_pipeline << "default pipeline for ffmpeg" << endl;
}
ostringstream line;
line << "filesrc location=\"" << file_name << "\"";
line << " ! ";
line << getValue(demuxPluginByContainer(), containerByName(file_name), "Invalid container");
line << " ! ";
if (backend.find("basic") == 4)
line << "decodebin";
else if (backend.find("vaapi") == 4)
line << "vaapidecodebin";
else if (backend.find("libav") == 4)
line << getValue(libavDecodeElementByCodec(), codec, "Invalid codec");
else if (backend.find("mfx") == 4)
line << getValue(mfxDecodeElementByCodec(), codec, "Invalid or unsupported codec");
else
{
cout << "Unsupported pipeline: " << pipeline << endl;
cmd_parser->printErrors();
return -1;
}
return 0;
return Ptr<VideoCapture>();
line << " ! videoconvert n-threads=" << getNumThreads();
line << " ! appsink sync=false";
cout << "Created GStreamer capture ( " << line.str() << " )" << endl;
return makePtr<VideoCapture>(line.str(), CAP_GSTREAMER);
}
// Choose the constructed GStreamer pipeline for encode
int createEncodePipeline()
else if (backend == "ffmpeg")
{
if (checkConfiguration() < 0) return -1;
ostringstream test_pipeline;
test_pipeline << "videotestsrc pattern=smpte";
test_pipeline << " ! video/x-raw, " << getVideoSettings();
test_pipeline << " ! appsink sync=false";
cap = VideoCapture(test_pipeline.str(), CAP_GSTREAMER);
if (pipeline == "default") {
wrt = VideoWriter(file_name, CAP_GSTREAMER, getFourccCode(), fix_fps, fix_size, true);
}
else if (pipeline.find("gst") == 0)
{
stream_pipeline << "appsrc ! videoconvert n-threads=" << getNumThreads() << " ! ";
cout << "Created FFmpeg capture ( " << file_name << " )" << endl;
return makePtr<VideoCapture>(file_name, CAP_FFMPEG);
}
return Ptr<VideoCapture>();
}
if (pipeline.find("basic") == 4)
{
stream_pipeline << getGstDefaultCodePlugin();
}
else if (pipeline.find("vaapi1710") == 4)
{
stream_pipeline << getGstVaapiCodePlugin();
}
else if (pipeline.find("libav") == 4)
{
stream_pipeline << getGstAvCodePlugin();
}
else
{
cout << "Unsupported pipeline: " << pipeline << endl;
cmd_parser->printErrors();
return -1;
}
inline Ptr<VideoCapture> createSynthSource(Size sz, unsigned fps)
{
ostringstream line;
line << "videotestsrc pattern=smpte";
line << " ! video/x-raw";
line << ",width=" << sz.width << ",height=" << sz.height;
if (fps > 0)
line << ",framerate=" << fps << "/1";
line << " ! appsink sync=false";
cout << "Created synthetic video source ( " << line.str() << " )" << endl;
return makePtr<VideoCapture>(line.str(), CAP_GSTREAMER);
}
stream_pipeline << " ! " << getGstMuxPlugin();
stream_pipeline << " ! filesink location=\"" << file_name << "\"";
wrt = VideoWriter(stream_pipeline.str(), CAP_GSTREAMER, 0, fix_fps, fix_size, true);
}
else if (pipeline == "ffmpeg")
{
wrt = VideoWriter(file_name, CAP_FFMPEG, getFourccCode(), fix_fps, fix_size, true);
stream_pipeline << "default pipeline for ffmpeg" << endl;
}
else
{
cout << "Unsupported pipeline: " << pipeline << endl;
cmd_parser->printErrors();
return -1;
}
return 0;
inline Ptr<VideoWriter> createWriter(const string &backend, const string &file_name, const string &codec, Size sz, unsigned fps)
{
if (backend == "gst-default")
{
cout << "Created GStreamer writer ( " << file_name << ", FPS=" << fps << ", Size=" << sz << ")" << endl;
return makePtr<VideoWriter>(file_name, CAP_GSTREAMER, getValue(fourccByCodec(), codec, "Invalid codec"), fps, sz, true);
}
// Choose video resolution for encoding
string getVideoSettings()
else if (backend.find("gst") == 0)
{
ostringstream video_size;
if (fix_fps > 0) { video_size << "framerate=" << fix_fps << "/1, "; }
else
{
cout << "Unsupported fps (< 0): " << fix_fps << endl;
cmd_parser->printErrors();
return string();
}
if (resolution == "720p") { fix_size = Size(1280, 720); }
else if (resolution == "1080p") { fix_size = Size(1920, 1080); }
else if (resolution == "4k") { fix_size = Size(3840, 2160); }
ostringstream line;
line << "appsrc ! videoconvert n-threads=" << getNumThreads() << " ! ";
if (backend.find("basic") == 4)
line << getValue(defaultEncodeElementByCodec(), codec, "Invalid codec");
else if (backend.find("vaapi") == 4)
line << getValue(VAAPIEncodeElementByCodec(), codec, "Invalid codec");
else if (backend.find("libav") == 4)
line << getValue(libavEncodeElementByCodec(), codec, "Invalid codec");
else if (backend.find("mfx") == 4)
line << getValue(mfxEncodeElementByCodec(), codec, "Invalid codec");
else
{
cout << "Unsupported video resolution: " << resolution << endl;
cmd_parser->printErrors();
return string();
}
video_size << "width=" << fix_size.width << ", height=" << fix_size.height;
return video_size.str();
return Ptr<VideoWriter>();
line << " ! ";
line << getValue(muxPluginByContainer(), containerByName(file_name), "Invalid container");
line << " ! ";
line << "filesink location=\"" << file_name << "\"";
cout << "Created GStreamer writer ( " << line.str() << " )" << endl;
return makePtr<VideoWriter>(line.str(), CAP_GSTREAMER, 0, fps, sz, true);
}
// Choose a video container
string getGstMuxPlugin()
else if (backend == "ffmpeg")
{
ostringstream plugin;
if (container == "avi") { plugin << "avi"; }
else if (container == "mp4") { plugin << "qt"; }
else if (container == "mov") { plugin << "qt"; }
else if (container == "mkv") { plugin << "matroska"; }
else
{
cout << "Unsupported container: " << container << endl;
cmd_parser->printErrors();
return string();
}
cout << "Created FFMpeg writer ( " << file_name << ", FPS=" << fps << ", Size=" << sz << " )" << endl;
return makePtr<VideoWriter>(file_name, CAP_FFMPEG, getValue(fourccByCodec(), codec, "Invalid codec"), fps, sz, true);
}
return Ptr<VideoWriter>();
}
if (mode == "decode") { plugin << "demux"; }
else if (mode == "encode") { plugin << "mux"; }
else
{
cout << "Unsupported mode: " << mode << endl;
cmd_parser->printErrors();
return string();
}
//================================================================================
return plugin.str();
int main(int argc, char *argv[])
{
const string keys =
"{h help usage ? | | print help messages }"
"{m mode |decode | coding mode (supported: encode, decode) }"
"{b backend |default | video backend (supported: 'gst-default', 'gst-basic', 'gst-vaapi', 'gst-libav', 'gst-mfx', 'ffmpeg') }"
"{c codec |h264 | codec name (supported: 'h264', 'h265', 'mpeg2', 'mpeg4', 'mjpeg', 'vp8') }"
"{f file path | | path to file }"
"{r resolution |720p | video resolution for encoding (supported: '720p', '1080p', '4k') }"
"{fps |30 | fix frame per second for encoding (supported: fps > 0) }"
"{fast | | fast measure fps }";
CommandLineParser cmd_parser(argc, argv, keys);
cmd_parser.about("This program measures performance of video encoding and decoding using different backends OpenCV.");
if (cmd_parser.has("help"))
{
cmd_parser.printMessage();
return 0;
}
// Choose a libav codec
string getGstAvCodePlugin()
bool fast_measure = cmd_parser.has("fast"); // fast measure fps
unsigned fix_fps = cmd_parser.get<unsigned>("fps"); // fixed frame per second
string backend = cmd_parser.get<string>("backend"); // video backend
string mode = cmd_parser.get<string>("mode"); // coding mode
string codec = cmd_parser.get<string>("codec"); // codec type
string file_name = cmd_parser.get<string>("file"); // path to videofile
string resolution = cmd_parser.get<string>("resolution"); // video resolution
if (!cmd_parser.check())
{
ostringstream plugin;
if (mode == "decode")
{
if (codec == "h264") { plugin << "h264parse ! "; }
else if (codec == "h265") { plugin << "h265parse ! "; }
plugin << "avdec_";
}
else if (mode == "encode") { plugin << "avenc_"; }
else
{
cout << "Unsupported mode: " << mode << endl;
cmd_parser->printErrors();
return string();
}
if (codec == "h264") { plugin << "h264"; }
else if (codec == "h265") { plugin << "h265"; }
else if (codec == "mpeg2") { plugin << "mpeg2video"; }
else if (codec == "mpeg4") { plugin << "mpeg4"; }
else if (codec == "mjpeg") { plugin << "mjpeg"; }
else if (codec == "vp8") { plugin << "vp8"; }
else
{
cout << "Unsupported libav codec: " << codec << endl;
cmd_parser->printErrors();
return string();
}
return plugin.str();
cmd_parser.printErrors();
return -1;
}
if (mode != "encode" && mode != "decode")
{
cout << "Unsupported mode: " << mode << endl;
return -1;
}
cout << "Mode: " << mode << ", Backend: " << backend << ", File: " << file_name << ", Codec: " << codec << endl;
// Choose a vaapi codec
string getGstVaapiCodePlugin()
TickMeter total;
Ptr<VideoCapture> cap;
Ptr<VideoWriter> wrt;
try
{
ostringstream plugin;
if (mode == "decode")
{
plugin << "vaapidecodebin";
if (container == "mkv") { plugin << " ! autovideoconvert"; }
else { plugin << " ! video/x-raw, format=YV12"; }
cap = createCapture(backend, file_name, codec);
if (!cap)
{
cout << "Failed to create video capture" << endl;
return -3;
}
if (!cap->isOpened())
{
cout << "Capture is not opened" << endl;
return -4;
}
}
else if (mode == "encode")
{
if (codec == "h264") { plugin << "vaapih264enc"; }
else if (codec == "h265") { plugin << "vaapih265enc"; }
else if (codec == "mpeg2") { plugin << "vaapimpeg2enc"; }
else if (codec == "mjpeg") { plugin << "vaapijpegenc"; }
else if (codec == "vp8") { plugin << "vaapivp8enc"; }
else
Size sz = getValue(sizeByResolution(), resolution, "Invalid resolution");
cout << "FPS: " << fix_fps << ", Frame size: " << sz << endl;
cap = createSynthSource(sz, fix_fps);
wrt = createWriter(backend, file_name, codec, sz, fix_fps);
if (!cap || !wrt)
{
cout << "Unsupported vaapi codec: " << codec << endl;
cmd_parser->printErrors();
return string();
cout << "Failed to create synthetic video source or video writer" << endl;
return -3;
}
if (!cap->isOpened() || !wrt->isOpened())
{
cout << "Synthetic video source or video writer is not opened" << endl;
return -4;
}
}
else
{
cout << "Unsupported mode: " << resolution << endl;
cmd_parser->printErrors();
return string();
}
return plugin.str();
}
catch (...)
{
cout << "Unsupported parameters" << endl;
return -2;
}
// Choose a default codec
string getGstDefaultCodePlugin()
TickMeter tick;
Mat frame;
Mat element;
total.start();
while(true)
{
ostringstream plugin;
if (mode == "decode")
{
plugin << " ! decodebin";
tick.start();
if (!cap->grab())
{
cout << "No more frames - break" << endl;
break;
}
if (!cap->retrieve(frame))
{
cout << "Failed to retrieve frame - break" << endl;
break;
}
if (frame.empty())
{
cout << "Empty frame received - break" << endl;
break;
}
tick.stop();
}
else if (mode == "encode")
{
if (codec == "h264") { plugin << "x264enc"; }
else if (codec == "h265") { plugin << "x265enc"; }
else if (codec == "mpeg2") { plugin << "mpeg2enc"; }
else if (codec == "mjpeg") { plugin << "jpegenc"; }
else if (codec == "vp8") { plugin << "vp8enc"; }
else
int limit = 100;
while (!cap->grab() && --limit != 0)
{
cout << "Unsupported default codec: " << codec << endl;
cmd_parser->printErrors();
return string();
cout << "Skipping empty input frame - " << limit << endl;
}
cap->retrieve(element);
tick.start();
*wrt << element;
tick.stop();
}
else
{
cout << "Unsupported mode: " << resolution << endl;
cmd_parser->printErrors();
return string();
}
return plugin.str();
}
// Get fourcc for codec
int getFourccCode()
{
if (codec == "h264") { return VideoWriter::fourcc('H','2','6','4'); }
else if (codec == "h265") { return VideoWriter::fourcc('H','E','V','C'); }
else if (codec == "mpeg2") { return VideoWriter::fourcc('M','P','E','G'); }
else if (codec == "mpeg4") { return VideoWriter::fourcc('M','P','4','2'); }
else if (codec == "mjpeg") { return VideoWriter::fourcc('M','J','P','G'); }
else if (codec == "vp8") { return VideoWriter::fourcc('V','P','8','0'); }
else
if (fast_measure && tick.getCounter() >= 1000)
{
cout << "Unsupported ffmpeg codec: " << codec << endl;
cmd_parser->printErrors();
return 0;
cout << "Fast mode frame limit reached - break" << endl;
break;
}
}
// Check bad configuration
int checkConfiguration()
{
if ((codec == "mpeg2" && getGstMuxPlugin() == "qtmux") ||
(codec == "h265" && getGstMuxPlugin() == "avimux") ||
(pipeline == "gst-libav" && (codec == "h264" || codec == "h265")) ||
(pipeline == "gst-vaapi1710" && codec=="mpeg2" && resolution=="4k") ||
(pipeline == "gst-vaapi1710" && codec=="mpeg2" && resolution=="1080p" && fix_fps > 30))
if (mode == "encode" && tick.getCounter() >= 1000)
{
cout << "Unsupported configuration" << endl;
cmd_parser->printErrors();
return -1;
cout << "Encode frame limit reached - break" << endl;
break;
}
return 0;
}
bool fast_measure; // fast measure fps
string pipeline, // gstreamer pipeline type
container, // container type
mode, // coding mode
codec, // codec type
file_name, // path to videofile
resolution; // video resolution
int fix_fps; // fixed frame per second
Size fix_size; // fixed frame size
VideoWriter wrt;
VideoCapture cap;
ostringstream stream_pipeline;
CommandLineParser* cmd_parser;
};
int main(int argc, char *argv[])
{
try
total.stop();
if (tick.getCounter() == 0)
{
GStreamerPipeline pipe(argc, argv);
return pipe.run();
cout << "No frames have been processed" << endl;
return -10;
}
catch(const Exception& e)
else
{
cerr << e.what() << endl;
return 1;
double res_fps = tick.getCounter() / tick.getTimeSec();
cout << tick.getCounter() << " frames in " << tick.getTimeSec() << " sec ~ " << res_fps << " FPS" << " (total time: " << total.getTimeSec() << " sec)" << endl;
}
return 0;
}

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