When I create a video with OpenCV's VideoWriter class, it outputs something like this in the terminal :
Output #0, avi, to 'video.avi':
Stream #0.0: Video: mpeg4, yuv420p, 512x384, q=2-31, 12582 kb/s, 90k tbn, 24 tbc
I'd like to disable this but I have no idea how to do this.
"Mute" the console for a while. Ref.
#include <iostream>
#include <fstream>
int main ( int argc, char** argv )
{
std::streambuf* cout_sbuf = std::cout.rdbuf(); // save original sbuf
std::ofstream fout("temp");
std::cout<<"A\n";
std::cout.rdbuf(fout.rdbuf()); // redirect 'cout' to a 'fout'
std::cout<<"B\n";
std::cout.rdbuf(cout_sbuf); // restore the original stream buffer
std::cout<<"C\n";
return 0;
}
Console output:
A
C
Related
System information
OpenCV => 3.3.0
Operating System / Platform => Ubuntu 16.04, x86_64
Compiler => gcc version 5.4.1 20160904
Cuda => 8.0
Nvidia card => GTX 1080 Ti
ffmpeg details
libavutil 55. 74.100 / 55. 74.100
libavcodec 57.103.100 / 57.103.100
libavformat 57. 77.100 / 57. 77.100
libavdevice 57. 7.101 / 57. 7.101
libavfilter 6.100.100 / 6.100.100
libswscale 4. 7.103 / 4. 7.103
libswresample 2. 8.100 / 2. 8.100
Detailed description
i am trying to play a rtsp stream using cudacodec::VideoReader
Rtsp Stream Details ( from vlc )
this stream plays fine in vlc and cv::VideoCapture but when i try to play it in cudacodec::VideoReader i get a error saying:
OpenCV Error: Gpu API call (CUDA_ERROR_FILE_NOT_FOUND [Code = 301]) in CuvidVideoSource, file /home/deep/Development/libraries/opencv/opencv/modules/cudacodec/src/cuvid_video_source.cpp, line 66
OpenCV Error: Assertion failed (init_MediaStream_FFMPEG()) in FFmpegVideoSource, file /home/deep/Development/libraries/opencv/opencv/modules/cudacodec/src/ffmpeg_video_source.cpp, line 101
Steps to reproduce
#include <iostream>
#include "opencv2/opencv_modules.hpp"
#if defined(HAVE_OPENCV_CUDACODEC)
#include <opencv2/core.hpp>
#include <opencv2/cudacodec.hpp>
#include <opencv2/highgui.hpp>
int main(int argc, const char* argv[])
{
const std::string fname = "rtsp://admin:admin#192.168.1.13/media/video2";
cv::namedWindow("GPU", cv::WINDOW_NORMAL);
cv::cuda::GpuMat d_frame;
cv::Ptr<cv::cudacodec::VideoReader> d_reader = cv::cudacodec::createVideoReader(fname);
for (;;)
{
if (!d_reader->nextFrame(d_frame))
break;
cv::Mat frame;
d_frame.download(frame);
cv::imshow("GPU", frame);
if (cv::waitKey(3) > 0)
break;
}
return 0;
}
#else
int main()
{
std::cout << "OpenCV was built without CUDA Video decoding support\n" << std::endl;
return 0;
}
#endif
I tried debugging it using GDB and saw that in ffmpeg_video_source.cpp bool init_MediaStream_FFMPEG() directly returns without checking the if condition.
GDB output
cv::cudacodec::detail::FFmpegVideoSource::FFmpegVideoSource
(this=0x402a20 <_start>, fname=...) at /home/deep/Development/libraries/opencv/opencv/modules/cudacodec/src/ffmpeg_video_source.cpp:98
98 cv::cudacodec::detail::FFmpegVideoSource::FFmpegVideoSource(const String& fname) :
(gdb) n
99 stream_(0)
(gdb) n
101 CV_Assert( init_MediaStream_FFMPEG() );
(gdb) s
(anonymous namespace)::init_MediaStream_FFMPEG () at /home/deep/Development/libraries/opencv/opencv/modules/cudacodec/src/ffmpeg_video_source.cpp:94
94 return initialized;
(gdb) display initialized
4: initialized = false
(gdb) s
95 }
UPDATE:
I have solved the problem. solution link
In the solution provided here the problem was related to the pixel format detected by ffmpeg.
In order to check your rtsp pixel format you can use ffprobe.
Then inside your cap_ffmpeg_impl.hpp you should add the case related to your pixel format like
case AV_PIX_FMT_YUV420P:
case AV_PIX_FMT_YUVJ420P:
*chroma_format = ::VideoChromaFormat_YUV420;
break;
And then rebuild opencv.
I write simple application and have problem with raspicam library. I've opened simpletest_raspicamm.cpp:
#include <ctime>
#include <fstream>
#include <iostream>
#include <raspicam/raspicam.h>
using namespace std;
int main ( int argc,char **argv ) {
raspicam::RaspiCam Camera; //Cmaera object
//Open camera
cout<<"Opening Camera..."<<endl;
if ( !Camera.open()) {cerr<<"Error opening camera"<<endl;return -1;}
//wait a while until camera stabilizes
cout<<"Sleeping for 3 secs"<<endl;
//capture
Camera.grab();
//allocate memory
unsigned char *data=new unsigned char[ Camera.getImageTypeSize ( raspicam::RASPICAM_FORMAT_RGB )];
//extract the image in rgb format
Camera.retrieve ( data,raspicam::RASPICAM_FORMAT_RGB );//get camera image
//save
std::ofstream outFile ( "raspicam_image.ppm",std::ios::binary );
outFile<<"P6\n"<<Camera.getWidth() <<" "<<Camera.getHeight() <<" 255\n";
outFile.write ( ( char* ) data, Camera.getImageTypeSize ( raspicam::RASPICAM_FORMAT_RGB ) );
cout<<"Image saved at raspicam_image.ppm"<<endl;
//free resrources
delete data;
return 0;
}
And console returns me cout:
/home/pi/Desktop/raspicam-0.0.7/src/private/private_impl.cpp:171 :Private_Impl::retrieve type is not RASPICAM_FORMAT_IGNORE as it should be
Image saved at raspicam_image.ppm
I use raspicam 0.0.7 i tried to use every other version and nothings changes. I compile use command:
g++ -ggdb -o `basename server.cpp .cpp` server1.cpp -I/usr/local/include/ - lraspicam -L/opt/vc/lib
I've tried to use Camera.setFormat(raspicam::RASPICAM_FORMAT_IGNORE) and have no idea how to fix it. I work on raspberry pi 2, but on rpi3 everything works fine.
It appears that the interface of retrieve() has been changed since v0.0.5 according to the comments in the header file.
Basically the parameter is useless now, and can be always set to RASPICAM_FORMAT_IGNORE, or just left blank for the C++ default parameter to kick in. The warning you're seeing basically does nothing and won't have any impact on the performance.
Format can now be set by an independent function
void setFormat ( RASPICAM_FORMAT fmt );
So I have played around in OpenCV a bunch before and never run into this problem. I am implementing a MeanShift algorithm and trying to do it on video devices, images, and videos. Devices and images work; however, no matter what I try, when I run VideoCapture on my filename (whether setting it in the Constructor or using the VideoCapture::open() method, and whether local or with a full path) I always get stuck in my error check.
Thoughts? Ideas? code below. running in Visual Studio 2012
#include "opencv2\highgui\highgui.hpp"
#include "opencv2\core\core.hpp"
#include "opencv2\opencv.hpp"
#include "opencv2\video\video.hpp"
#include <string>
using cv::Mat;
using std::string;
enum Filetype{Image, Video};
int main(int argc, char* argv[])
{
string filename = "short_front.avi";// "C:\\Users\\Jonathan\\Videos\\short_front.mp4"; //"hallways.jpg";
Mat cv_image; //convert to unsigned char * with data
Mat filtImage_;
Mat segmImage_;
Mat whiteImage_;
cv::VideoCapture vid;
vid.open("C:/Users/Jonathan/Desktop/TestMeanShift/TestMeanShift/short_front.avi");
cv::waitKey(1000);
if ( !vid.isOpened() ){
throw "Error when reading vid";
cv::waitKey(0);
return -1;
}
// cv_image = cv::imread(filename);//, CV_LOAD_IMAGE_COLOR);
// if(! cv_image.data){
// std::cerr << "Image Failure: " << std::endl;
// system("pause");
// return -1;
// }
//Mat cv_image_gray;
//cv::cvtColor(cv_image,cv_image_gray,CV_RGB2GRAY);
for (;;)
{
vid >> cv_image;
if ( !cv_image.data)
continue;
cv::imshow("Input",cv_image); //add a normal window here to resizable
}
EDIT: This is a distinct problem from the one listed here because it deals with a specific corner case: VideoCapture and ImageCapture both work, only not VideoCapture with a file. When it doesn't work, the code runs properly, except that the "video" it creates is incomplete as it didn't open properly. Therefore, as the code above does not crash in compile time or run time, the only indicator is bad output (6KB video output file). If you are having issues not with the corner case I am describing but general issues with the above functions in OpenCV, the aforementioned link could help you.
Deal all,
I need to decode an animated gif format picture into some bitmap files in MFC2010. Is there any library to decode a gif picture? I cannot use GDIPlus because the program has to run on windows XP. I do appreciate if someone provides me with a library, Activex, dll or anything similar.
Many Thanks,
Shervin Zargham
It's pretty simple using ImageMagick's C++ API (Magick++) :
/* list of Image to store the GIF's frames */
std::vector<Magick::Image> imageList;
/* read all the frames of the animated GIF */
Magick::readImages( &imageList, "animated.gif" );
/* optionnally coalesce the frame sequence depending on the expected result */
Magick::coalesceImages( &imageList, imageList.begin(), imageList.end());
/* store each frame in a separate BMP file */
for(unsigned int i = 0; i < imageList.size(); ++i) {
std::stringstream ss;
ss << "frame" << i << ".bmp";
imageList[i].write(ss.str());
}
WIC (included in Vista, available for XP) offers CLSID_WICGifDecoder, a COM component.
Try this using ImageMagick's C++ API (Magick++) ,tested on VS210:
#include <Magick++.h>
#include <string>
#include <iostream>
#include <list>
using namespace std;
using namespace Magick;
void kk(char * nombre, char *ext)
{
/* list of Image to store the GIF's frames */
std::list<Magick::Image> imageList;
/* read all the frames of the animated GIF */
Magick::readImages( &imageList, nombre );
/* compone las diferencias para obtener los cuadros reales */
Magick::coalesceImages(&imageList,imageList.begin( ),imageList.end( ));
/* store each frame in a separate BMP file */
list <Magick::Image>::iterator it;
int i=1;
for ( it = imageList.begin( ); it != imageList.end( ); it++ , i++)
{
std::string name = "frame" + to_string((_Longlong)(i)) + ext ;
it->write(name);
}
}
int main( int /*argc*/, char ** argv)
{
// Initialize ImageMagick install location for Windows
InitializeMagick(*argv);
try {
kk("luni0.gif", ".png"); // using ".bmp", ".jpg", ".png", OK
return 0;
}
catch( exception &error_ )
{
cout << "Caught exception: " << error_.what() << endl;
return 1;
}
}
It's been a long time, but I recall once using OleLoadPicture to open GIF and PNG files on old versions of Windows, though the documentation seems to suggest that it's only for BMP, ICO, and WMF.
I have a 33 second video that I'm trying to process with OpenCV. My goal is to determine what instance in time (relative to the start of the video) each frame corresponds to. I'm doing this in order to be able to compare frames from videos of the same scene that have been recorded at different frame rates.
What's working:
The FPS is correctly reported as 59.75. This is consistent with what ffprobe reports, so I'm happy to believe that's correct.
The problems I'm having are:
CAP_PROP_POS_MSEC returns incorrect values. By the end of the video, it's up to 557924ms (over 9 min). For a 33s video, this can't be right.
CAP_PROP_FRAME_COUNT is also incorrect. It's reported as 33371, which at 59.75 fps would give over 9 minutes worth of footage. Consistent with the above error, but still incorrect.
CAP_PROP_POS_FRAME is similarly incorrect.
The video can be found here (approx. 10MB).
Any ideas on what could be wrong?
ffprobe output:
FFprobe version SVN-r20090707, Copyright (c) 2007-2009 Stefano Sabatini
libavutil 49.15. 0 / 49.15. 0
libavcodec 52.20. 0 / 52.20. 1
libavformat 52.31. 0 / 52.31. 0
built on Jan 20 2010 00:13:01, gcc: 4.4.3 20100116 (prerelease)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/misha/Dropbox/Public/sequence.mp4':
Duration: 00:00:33.37, start: 0.000000, bitrate: 2760 kb/s
Stream #0.0(und): Video: h264, yuv420p, 1920x1080, 59.75 tbr, 1k tbn, 2k tbc
Stream #0.1(und): Audio: aac, 44100 Hz, stereo, s16
Full code:
#include <iostream>
#include <assert.h>
#include <cv.h>
#include <highgui.h>
#include <cmath>
#include <iostream>
#include <string.h>
#include <stdio.h>
extern "C"
{
#include "options.h"
}
using namespace std;
#define DEBUG 0
static void
print_usage(char *argv0)
{
cerr << "usage: " << argv0 << " video.avi [options]" << endl;
}
int main(int argc, char** argv)
{
if (argc < 2)
{
print_usage(argv[0]);
return -1;
}
int step = 30;
struct Option options[] =
{
{ "step", 1, &step },
{ NULL, 0, NULL }
};
int ret = parse_options(2, argc, argv, options);
if (ret == 0)
{
print_usage(argv[0]);
return -1;
}
CvCapture *capture = cvCaptureFromFile(argv[1]);
int counter = 0;
while (cvGrabFrame(capture))
{
++counter;
IplImage *frame = cvRetrieveFrame(capture);
double millis = cvGetCaptureProperty(capture, CV_CAP_PROP_POS_MSEC);
double current = cvGetCaptureProperty(capture, CV_CAP_PROP_POS_FRAMES);
double total = cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_COUNT);
printf("%d %d/%d %f\n", counter, (int)current, (int)total, millis);
int min = (int)(millis/1000/60);
millis -= min*60000;
int sec = (int)(millis/1000);
millis -= sec*1000;
printf("%d %02d:%02d:%f\n", counter, min, sec, millis);
}
cvReleaseCapture(&capture);
return 0;
}
Always inform the software version you are using: which OpenCV version are you using for that? Yours might be an old version, so update to the most recent if possible.
If your video file is part of some other larger video, this information might actually be correct, since:
CV_CAP_PROP_POS_MSEC - film current position in milliseconds or video capture timestamp
OpenCV might be simply reading all these stuff from the file header, which is obviously wrong. This could happen if someone used an ax (or other medieval tool) to strip this piece from the original video.
You should try with videos that you made and you know they haven't been tampered with.
Worst case scenario, you will have to implement these features yourself. No biggie.
EDIT:
#misha I didn't notice at first that you are using:
CvCapture *capture = cvCaptureFromFile(argv[1]);
Replace it for cvCaptureFromAVI() if you can, and ALWAYS check the return value of OpenCV calls:
CvCapture *capture = cvCaptureFromAVI(argv[1]);
if(!capture)
{
printf("!!! cvCaptureFromAVI failed (file not found?)\n");
return -1;
}
A few days ago I shared a code that uses OpenCV to read a video file and then save the frames as JPG images on the disk. It also reports the current FPS using the traditional cvGetCaptureProperty(capture, CV_CAP_PROP_FPS); so it could be interesting for you to take a look at that. Go check it out.
EDIT:
You should also check this thread about frame count using OpenCV;
By the way, I just updated some libraries on my Ubuntu system and recompiled OpenCV-2.1.0.tar.bz2 (using cmake). I changed my source code (that uses cvCaptureFromAVI()) to print stuff using your debug method on each frame. It seems it works:
* Filename: sequence.mp4
* FPS: 59
...
...
...
17 00:00:567.000000
18 601/33371 601.000000
18 00:00:601.000000
19 634/33371 634.000000
19 00:00:634.000000
20 668/33371 668.000000
20 00:00:668.000000
21 701/33371 701.000000
21 00:00:701.000000
22 734/33371 734.000000
22 00:00:734.000000
23 768/33371 768.000000
23 00:00:768.000000
24 801/33371 801.000000
24 00:00:801.000000
25 835/33371 835.000000
25 00:00:835.000000
26 868/33371 868.000000
26 00:00:868.000000
27 901/33371 901.000000
27 00:00:901.000000
28 935/33371 935.000000
...