C ++ OpenCV 3.4/FFMPEG 3.4.1 VideoWriter和MP4输出文件格式 [英] C++ OpenCV 3.4 / FFMPEG 3.4.1 VideoWriter and MP4 Output File Format

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本文介绍了C ++ OpenCV 3.4/FFMPEG 3.4.1 VideoWriter和MP4输出文件格式的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在带有Linux内核4.9.35-ti-r44的ARM BeagleBone X-15 Debian机器上运行.在我的C ++(Qt 5)应用程序中，我想将cv :: Mat帧保存到MP4格式的视频中.我已经安装了ffmpeg和OpenCv并从头开始编译了libx264.我可以使用AVI视频容器类型而不是MP4的MJPEG成功录制和观看视频.每当我尝试编写MP4视频时，都会出现以下形式的运行时错误:

I'm running on an ARM BeagleBone X-15 Debian machine with Linux Kernel 4.9.35-ti-r44. In my C++ ( Qt 5 ) application, I want to save my cv::Mat frames to an MP4 format video. I have libx264 installed and compiled from scratch both ffmpeg and OpenCv. I can successfully record and view video with MJPEG with the AVI video container type but not MP4. Whenever I try to write an MP4 video, I get run time errors of the form:

OpenCV: FFMPEG: tag 0x44495658/'XVID' is not supported with codec id 13 and format 'mp4 / MP4 (MPEG-4 Part 14)'
OpenCV: FFMPEG: fallback to use tag 0x00000020/' ???'

我尝试了各种Google答案，但是都没有用.

I've tried various Google answers but none have worked.

相关代码:

cv::Size frameSize = frame.size();

qDebug() << "Initializing Video Recording to save Video file here: " << destinationFileName;

std::string filename = destinationFileName.toStdString();
//int fcc =   CV_FOURCC('M','J','P','G');
//int fcc =   CV_FOURCC('X','2','6','4');
int fcc = CV_FOURCC('X','V','I','D');
int fps =   1;
videoRecorder = new cv::VideoWriter(filename,fcc,fps,frameSize);

...

videoRecorder->write(frame);

我已经下载并构建了最新的OpenCV 3.4，但问题仍然存在.如何使用OpenCV的视频编写器写入MP4文件?

I've downloaded and built the latest OpenCV 3.4 but the problem persists. How can I write to an MP4 File with OpenCV's video writer?

当我尝试使用'X'，'2'，'6'，'4'格式时，出现错误:

When I try the 'X','2','6','4' format I get the error:

    Initializing Video Recording to save Video file here:  "/tmp/Garage.mp4"
OpenCV: FFMPEG: tag 0x34363258/'X264' is not supported with codec id 28 and format 'mp4 / MP4 (MPEG-4 Part 14)'
OpenCV: FFMPEG: fallback to use tag 0x31637661/'avc1'
[h264_v4l2m2m @ 0x81042020] Could not find a valid device
[h264_v4l2m2m @ 0x81042020] can't configure encoder
Could not open codec 'h264_v4l2m2m': Unspecified error
Starting

当我尝试使用'X'，'V'，'I'，'D'格式时，出现错误:

When I try the 'X','V','I','D' format I get the error:

Initializing Video Recording to save Video file here:  "/tmp/Garage.mp4"
OpenCV: FFMPEG: tag 0x44495658/'XVID' is not supported with codec id 13 and format 'mp4 / MP4 (MPEG-4 Part 14)'
OpenCV: FFMPEG: fallback to use tag 0x7634706d/'mp4v'
Starting

当我尝试使用'M'，'P'，'E'，'G'格式时，出现错误:

When I try the 'M','P','E','G' format I get the error:

Initializing Video Recording to save Video file here:  "/tmp/Garage.mp4"
OpenCV: FFMPEG: tag 0x4745504d/'MPEG' is not supported with codec id 2 and format 'mp4 / MP4 (MPEG-4 Part 14)'
OpenCV: FFMPEG: fallback to use tag 0x7634706d/'mp4v'
Starting

当我尝试使用'H'，'2'，'6'，'4'格式时，出现错误消息:

When I try the 'H','2','6','4' format I get the error:

OpenCV: FFMPEG: tag 0x34363248/'H264' is not supported with codec id 28 and format 'mp4 / MP4 (MPEG-4 Part 14)'
OpenCV: FFMPEG: fallback to use tag 0x31637661/'avc1'
[h264_v4l2m2m @ 0x7fdde340] Could not find a valid device
[h264_v4l2m2m @ 0x7fdde340] can't configure encoder
Could not open codec 'h264_v4l2m2m': Unspecified error
Starting

当我尝试使用'M'，'P'，'4'，'V'格式时，出现错误:

When I try the 'M','P','4','V' format I get the error:

Initializing Video Recording to save Video file here:  "/tmp/Garage.mp4"
OpenCV: FFMPEG: tag 0x5634504d/'MP4V' is not supported with codec id 13 and format 'mp4 / MP4 (MPEG-4 Part 14)'
OpenCV: FFMPEG: fallback to use tag 0x7634706d/'mp4v'
Starting

当我尝试使用'A'，'V'，'C'，'1'格式时，出现错误:

When I try the 'A','V','C','1' format I get the error:

Initializing Video Recording to save Video file here:  "/tmp/Garage.mp4"
OpenCV: FFMPEG: tag 0x31435641/'AVC1' is not supported with codec id 28 and format 'mp4 / MP4 (MPEG-4 Part 14)'
OpenCV: FFMPEG: fallback to use tag 0x31637661/'avc1'
[h264_v4l2m2m @ 0x810f5f50] Could not find a valid device
[h264_v4l2m2m @ 0x810f5f50] can't configure encoder
Could not open codec 'h264_v4l2m2m': Unspecified error
Starting

当我尝试使用'D'，'I'，'V'，'X'格式时，出现错误:

When I try the 'D','I','V','X' format I get the error:

Initializing Video Recording to save Video file here:  "/tmp/Garage.mp4"
OpenCV: FFMPEG: tag 0x58564944/'DIVX' is not supported with codec id 13 and format 'mp4 / MP4 (MPEG-4 Part 14)'
OpenCV: FFMPEG: fallback to use tag 0x7634706d/'mp4v'
Starting

当我尝试使用0x21格式时，出现错误消息:

When I try the 0x21 format I get the error:

Initializing Video Recording to save Video file here:  "/tmp/Garage.mp4"
OpenCV: FFMPEG: tag 0x00000021/'!???' is not found (format 'mp4 / MP4 (MPEG-4 Part 14)')'
Starting

这是我完整的课程，其中显示了所有尝试过的格式:

Here is my complete class which shows all tried formats:

    #include "downloader.h"

Downloader::Downloader(QString url, QString destinationFile) : downloadUrl(url) , destinationFileName(destinationFile)
{

    didInitializeVideoWriter = false;

    qDebug() << "Initialized Downloader...";

}

Downloader::~Downloader() {

    videoRecorder->release();
    delete videoRecorder;

}

void Downloader::doDownload()
{
    networkManager = new QNetworkAccessManager(this);

    connect(networkManager, SIGNAL(finished(QNetworkReply*)),
            this, SLOT(replyFinished(QNetworkReply*)));

    networkManager->get(QNetworkRequest(QUrl(downloadUrl)));
}

void Downloader::writeFrame(cv::Mat frame) {

    QMutexLocker locker(&videoFrameMutex);

    videoRecorder->write(frame);

}

void Downloader::replyFinished(QNetworkReply *reply)
{

    if(reply->error())
    {
        qDebug() << "ERROR!";
        qDebug() << reply->errorString();
    }
    else
    {
        //qDebug() << reply->header(QNetworkRequest::ContentTypeHeader).toString();
        //qDebug() << reply->header(QNetworkRequest::LastModifiedHeader).toDateTime().toString();
        //qDebug() << reply->header(QNetworkRequest::ContentLengthHeader).toULongLong();
        qDebug() << reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
        qDebug() << reply->attribute(QNetworkRequest::HttpReasonPhraseAttribute).toString();

        QString tempFileName = destinationFileName;
        QString jpegTempFilename = QString("%1").arg(tempFileName.replace("mp4","jpeg"));

        qDebug() << "Overwriting: " << jpegTempFilename;
        QFile *file = new QFile(jpegTempFilename);
        if(file->open(QFile::WriteOnly))
        {
            file->write(reply->readAll());
            file->flush();
            file->close();
        }
        delete file;

        cv::Mat frame = imread(jpegTempFilename.toStdString(), CV_LOAD_IMAGE_COLOR);   // CV_LOAD_IMAGE_COLOR (>0) loads the image in the BGR format
        cv::cvtColor(frame,frame,CV_BGR2RGB);

        // Now lazy load the recorder
        if ( !didInitializeVideoWriter ) {

            cv::Size frameSize = frame.size();

            qDebug() << "Initializing Video Recording to save Video file here: " << destinationFileName;

            std::string filename = destinationFileName.toStdString();
            //int fcc =   CV_FOURCC('M','J','P','G');
            int fcc =   CV_FOURCC('X','2','6','4');
            //int fcc = CV_FOURCC('X','V','I','D');
            //int fcc = CV_FOURCC('M','P','E','G');
            //int fcc = CV_FOURCC('H','2','6','4');
            //int fcc = CV_FOURCC('M','P','4','V');
            //int fcc = CV_FOURCC('A','V','C','1');
            //int fcc = CV_FOURCC('D','I','V','X');
            //int fcc = 0x21;
            //int fcc = 0x00000021;
            int fps =   1;
            videoRecorder = new cv::VideoWriter(filename,fcc,fps,frameSize);

            qDebug() << "Starting";
            frameCounter = 1;
            performanceTimer.start();

            didInitializeVideoWriter = true;

        }

        cv::putText(frame,"[REC]",cv::Point(50,50),5,1,cv::Scalar(0,0,225));

        QFuture<void> backgroundRun = QtConcurrent::run(this, &Downloader::writeFrame, frame);
        //backgroundRun.waitForFinished();

    }

    reply->deleteLater();

    qDebug() << "RequestTimer: " << performanceTimer.elapsed() << frameCounter;

    // Requests Again
    networkManager->get(QNetworkRequest(QUrl(downloadUrl)));

    frameCounter++;

    performanceTimer.restart();


}

更新-我尝试了'a'，'v'，'c'，'1'，但不幸的是，这也行不通:

Update - I tried 'a','v','c','1' and unfortunately that also does not work:

Initializing Video Recording to save Video file here:  "/tmp/Garage.mp4"
[h264_v4l2m2m @ 0x810f6aa0] Could not find a valid device
[h264_v4l2m2m @ 0x810f6aa0] can't configure encoder
Could not open codec 'h264_v4l2m2m': Unspecified error

(qt-downloader:6234): GStreamer-CRITICAL **: gst_element_make_from_uri: assertion 'gst_uri_is_valid (uri)' failed
OpenCV Error: Unspecified error (GStreamer: cannot link elements
) in CvVideoWriter_GStreamer::open, file /media/usb/opencv/modules/videoio/src/cap_gstreamer.cpp, line 1635
VIDEOIO(cvCreateVideoWriter_GStreamer (filename, fourcc, fps, frameSize, is_color)): raised OpenCV exception:

/media/usb/opencv/modules/videoio/src/cap_gstreamer.cpp:1635: error: (-2) GStreamer: cannot link elements
 in function CvVideoWriter_GStreamer::open

当我尝试X264 FOURCC时，mp4文件为48字节，并且永不增大:

When I try the X264 FOURCC, the mp4 file is 48 bytes and never grows:

Initializing Video Recording to save Video file here:  "/tmp/Garage.mp4"
OpenCV: FFMPEG: tag 0x34363258/'X264' is not supported with codec id 27 and format 'mp4 / MP4 (MPEG-4 Part 14)'
OpenCV: FFMPEG: fallback to use tag 0x31637661/'avc1'

静态大小:

debian@BeagleBoard-X15:/tmp$ ls -lrt Garage.*
-rw-r--r-- 1 debian debian     48 Dec 24 21:13 Garage.mp4
-rw-r--r-- 1 debian debian 100424 Dec 24 21:14 Garage.jpeg
debian@BeagleBoard-X15:/tmp$ hexdump Garage.mp4 
0000000 0000 2000 7466 7079 7369 6d6f 0000 0002
0000010 7369 6d6f 7369 326f 7661 3163 706d 3134
0000020 0000 0800 7266 6565 0000 0000 646d 7461
0000030

这是我的ffmpeg build conf:

Here is my ffmpeg build conf:

debian@BeagleBoard-X15:/tmp$ ffmpeg -buildconf
ffmpeg version N-89524-g74f408cc8e Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 6.3.0 (Debian 6.3.0-18) 20170516
  configuration: --enable-gpl --enable-libx264 --enable-pthreads --enable-static --extra-cflags=-I./x264/include --extra-ldflags=-L./x264/lib --extra-libs=-ldl
  libavutil      56.  6.100 / 56.  6.100
  libavcodec     58.  8.100 / 58.  8.100
  libavformat    58.  3.100 / 58.  3.100
  libavdevice    58.  0.100 / 58.  0.100
  libavfilter     7.  7.100 /  7.  7.100
  libswscale      5.  0.101 /  5.  0.101
  libswresample   3.  0.101 /  3.  0.101
  libpostproc    55.  0.100 / 55.  0.100

  configuration:
    --enable-gpl
    --enable-libx264
    --enable-pthreads
    --enable-static
    --extra-cflags=-I./x264/include
    --extra-ldflags=-L./x264/lib
    --extra-libs=-ldl

推荐答案

我也遇到了类似的问题，但是在MacOS上运行.我通过重新安装X264库到最新版本来解决它，然后使用重新安装FFMPEG./configure --enable-libx264 --enable-gpl --enable-avresample --enable-shared 将新的X264正确链接到FFMPEG.然后，重新安装OpenCV(我正在使用3.4.4版)以链接新的FFMPEG.构建OpenCV时，请确保 FFMPEG 为 ON ，否则将使用内置的OpenCV编码器，这将为您提供更多的选择.

I had similar issue with you, but running on MacOS. I solved it by re-installing X264 library to the latest version, and then re-install FFMPEG with ./configure --enable-libx264 --enable-gpl --enable-avresample --enable-shared to link the new X264 to FFMPEG properly. Then, re-install OpenCV (I am using version 3.4.4) to link the new FFMPEG. When building the OpenCV, make sure that WITH FFMPEG is ON otherwise built-in OpenCV encoder will be used, which will give you more limited options.

这篇关于C ++ OpenCV 3.4/FFMPEG 3.4.1 VideoWriter和MP4输出文件格式的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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