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    Le thème graphique ne touche pas à la disposition à proprement dite des éléments dans la page. Il ne fait que modifier l’apparence des éléments.
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    Modifier le thème graphique utilisé
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Sur d’autres sites (4981)

  • Creating thumbnail using ffmpeg for video downloaded from youtube

    24 septembre 2015, par akhila

    Thanks in advance. I have trouble creating thumbnail for videos downloaded from youtube . I have downloaded videos using the youtube downloader extension and saved to mp4 format , When I upload a video to my site I use ffmpeg to create the thumbnail of the videos , For other mp4 videos it works perfectly fine but for youtube videos. Youtube videos are uploaded to the site and thumbnail creation not working. Here goes my code.

         system('ffmpeg -i '.$saveimgpath1.' -ss 00:00:00.010 -vframes 1 '.$thumbpath);

    The path given is correct as it works for other videos.Any help will be greatly appreciated .

  • Automating Basic Video Editing [closed]

    2 février, par user29470652

    What's guys ! I am a beginner in programming.

    


    As of now, I have created a basic YouTube downloader with the help of Python, FFmpeg, yt dlp, and Flaskapp.

    


    Now, I am automating the basic video editing part ( Turn bulk video files into a basic similar edit like we have one template then we add a caption from the title of the video, then place the video in the center of the template trim out to meet the video length of the given video then saving it) with the help of FFmpeg.

    


    Has anyone already tried or built it ?? Any marketer or video editor ??

    


    I am halfway to the project

    


    Here is theenter image description here

    


    I am halfway through the project and wonder if anyone has ever done it before like any video editor or marketer ??

    


  • C++ OpenCV 3.4 / FFMPEG 3.4.1 VideoWriter and MP4 Output File Format

    11 janvier 2019, par PhilBot

    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/' ???'

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

    Relevant code :

    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);

    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 ?

    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

    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

    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

    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

    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

    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

    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

    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

    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, &amp;Downloader::writeFrame, frame);
    
        //backgroundRun.waitForFinished();
    

    
    }
    

    
    reply->deleteLater();
    

    
    qDebug() &lt;&lt; "RequestTimer: " &lt;&lt; performanceTimer.elapsed() &lt;&lt; frameCounter;
    

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

    
    frameCounter++;
    

    
    performanceTimer.restart();
    

    

    
}
    
</void>

    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

    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'

    Static Size :

    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

    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

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