[Interest] Playing RTSP video on android

[Israel Brewster]

Environment:

Qt version: 6.6.3
Android version: 14, running via emulator
Android build-tools version: 34.0.0 (also tried 31.0.0)
Android build platform SDK: android-33 (also tried android-34)
JDK version 17 (tried 21 early on, but that one wouldn’t even build/deploy)
NDK version 25.1.8937393 (26.1.10909125 and 27.0.11902837 don’t create any kits, so not using them)
Building using Qt Creator version 12.0.2 on MacOS

Question/problem:

So now that I have photos displaying on Android, I wanted to be able to display a RTSP stream. To that end, I have the following code:

void MainWindow::testMediaPlayer(){
    if(videoFrame!=nullptr){
        videoFrame->deleteLater();
    }
    videoFrame=new QVideoWidget;
    ui->videoLayout->addWidget(videoFrame);

    if(videoPlayer!=nullptr){
        videoPlayer->deleteLater();
    }
    if(audioOutput!=nullptr){
        audioOutput->deleteLater();
    }

    videoPlayer=new QMediaPlayer;
    connect(this, &MainWindow::stopRTSP,
           videoPlayer,&QMediaPlayer::stop,
           Qt::QueuedConnection);
    audioOutput=new QAudioOutput;
    videoPlayer->setAudioOutput(audioOutput);
    videoPlayer->setVideoOutput(videoFrame);
    videoPlayer->setSource(QUrl("rtsp://xx.xx.xx.xx:554/11"));
    ui->viewStack->setCurrentIndex(1); //using a stacked widget to display video separately from still images.
    videoPlayer->play();
}

This code works fine when compiled/run on my mac, but when run on Android I just get a black screen. The QMediaPlayer documentation seems to indicate that FFMPEG is used on both Mac and Android platforms, so it seems as though if it works on one, it should work on the other (unless the Android version of FFMPEG is more limited?)

I tried giving my app the android.permission.INTERNET, which returns that it is granted when I request it, but that doesn’t appear to have helped.

Also, VLC on the emulator does play the video correctly, so apparently it’s not an access issue with the tablet not being able to access the stream.
---
Israel Brewster
Software Engineer
Alaska Volcano Observatory 
Geophysical Institute - UAF 
2156 Koyukuk Drive 
Fairbanks AK 99775-7320
Work: 907-474-5172
cell:  907-328-9145

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