Showing video from a rtsp ip camera

drakejest

I have hit a bricked wall in trying to show a rtsp from a cctv camera. Im using qt6 and have tried both C++ and QML to no avail. Im currently trying it on windows OS . I can already confirm that in vlc my rtsp link works. I can also confirm that both programs C++ and QML has no problem playing an mp4 file that is stored locally.

Here is my C++ attempt

    video = new QVideoWidget(this);
    video->setGeometry(80,80,this->width(),this->height());
    video->show();

    player = new QMediaPlayer(this);
    audio = new QAudioOutput(this);

    connect(player,&QMediaPlayer::errorChanged,this,&MainWindow::mediaPlayerDebugError);
    connect(player,&QMediaPlayer::mediaStatusChanged,this,&MainWindow::mediaPlayerDebugStatus);

    player->setVideoOutput(video);
    player->setSource(QUrl("rtsp://admin:admin@192.168.1.199:554/mpeg4/ch0/main/av_stream"));

    player->play();

C++ qDebug show me an error

Status Changed:  QMediaPlayer::LoadingMedia
Status Changed:  QMediaPlayer::InvalidMedia
Error:  QMediaPlayer::ResourceError

Here is my QML attempt

Window {
    id:mainWidow
    width: 600
    height: 600
    visible: true
    title: qsTr("Hello World")

    MediaPlayer {
        id: player
        source: "rtsp://admin:admin@192.168.1.199:554/mpeg4/ch0/main/av_stream"
        videoOutput: videoOutput

        onErrorOccurred: {
            console.log(player.errorString)
            console.log(player.mediaStatus)
        }

        Component.onCompleted: {mainWidow.title = qsTr("started"); player.play()}
    }

    VideoOutput {
        id: videoOutput
        anchors.fill: parent
        anchors.horizontalCenter: parent.horizontalCenter
    }

}

QML throws me an error of

qml: Failed to load source.
qml: 7  // QMediaPlayer::InvalidMedia

Invalid media seems to be the common problem, does anyone know how to fix this? or if you have successfully played a rtsp stream can you share how you did it? If you need info concerning the ip camera just tell me ill try to look for it.

drakejest

I have solved the C++ project and now im able to show the stream, but it really delayed around 10 seconds of delay compared to 4-5seconds of delay in VLC

The problem was i did not include QUrl

All includes in mainwindow.h

#include <QMainWindow>
#include <QMediaPlayer>
#include <QVideoWidget>
#include <QAudioOutput>
#include <QPushButton>
#include <QUrl>
#include <QDebug>

rtek1000

I found an onvif client that plays rtsp streams with practically no delay, the library written in c++ with visual studio 2019 is available, but the program's source code is paid, it's expensive, the installed program has qt6 dll.

https://www.happytimesoft.com/products/onvif-client/index.html

Another open source alternative is ffplay from ffmpeg, very little delay. Supports H.264 and H265.