Hey there! Since you haven’t shared the exact issue you’re hitting (like no video showing up, error popups, or freezing streams), I’ll walk through the most common problems and fixes based on your code snippet and the similar Qt RTSP project structure:

• Verify Your Qt Multimedia Backend
  Qt Multimedia relies on platform-specific backends to handle RTSP streams. For example:

  • On Linux, you need GStreamer and its RTSP plugins (gstreamer1.0-plugins-good, gstreamer1.0-plugins-bad).
  • On Windows, ensure DirectShow is set up correctly.
  • On macOS, AVFoundation should handle it, but double-check you’re using a Qt version with proper multimedia support.
    You can debug which backends are loaded with this line:

  qDebug() << QMediaPlayer::availableBackends();
  

• Validate the RTSP URL and Network
  First, test your RTSP stream in VLC or another media player to confirm it works outside Qt. If it does:

  • Check for typos in your URL (your snippet has a trailing ...—make sure it’s a complete, valid address).
  • If your camera requires authentication, format the URL like rtsp://username:password@camera-ip:port/stream-path.
  • Ensure your app has network permissions (critical for mobile or sandboxed desktop environments).

• Add Error Handling to Catch Issues
  Your current code doesn’t listen for QMediaPlayer errors, which is the best way to diagnose problems. Add this connection to get detailed error messages:

  connect(_player1, &QMediaPlayer::errorOccurred, [](QMediaPlayer::Error error, const QString &errorString) {
      qDebug() << "Stream error:" << error << "-" << errorString;
  });
  

  This will tell you if the issue is a missing codec, network timeout, or unsupported stream format.

• Tweak Video Widget Layout & Playback Trigger
  Sometimes the video widget doesn’t render because it’s not sized properly. Try adding these lines to ensure it expands and has a minimum size:

  _vw1->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
  _vw1->setMinimumSize(640, 480);
  

  Also, don’t forget to trigger playback! Your snippet doesn’t show the play() call—add this after setting the URL:

  _player1->setMedia(url1);
  _player1->play();
  

• Check Codec Support
  If the stream works in VLC but not Qt, you might be missing codec plugins. For GStreamer-based systems, install gstreamer1.0-libav to add support for more codecs like H.265. On Windows, you may need third-party DirectShow filters for less common codecs.

If you share the specific error message or behavior you’re seeing, I can narrow this down even more!

内容的提问来源于stack exchange，提问作者bacat26