How to record and play RTSP stream from ip camera

[Stuhalsky Alex]

Hi @jsulm. Yes, i tried.

In the first case i created file for writing manually and made sure it can be opened. The files were indeed created, but 0 bytes were written. I checked QMediaRecorder state. It have not been changed at all. Corresponding singnal was not emitting. Actual location was invalid and output location was empty string.

In the second case i tried simply to set output location in QMediaRecorder instance, but file was not created at all. Actual location was invalid, but output location contained correct QUrl path to local file.

I may miss something, because i tried many solutions during last couple of days. I can reimplement any solution that is supposed to work and check what happens.

[jsulm]

@Stuhalsky-Alex Can you play the stream in your Qt app?

[Stuhalsky Alex]

Hi @Bonnie

• "What platform?"
  Kubuntu 20.04.
  Forgot to mention it in the topic. I will add it there too.

• "I don't think it is possible to create a QCamera connected to some live stream url."
  Ok. Minus one option.

• "But QMediaRecorder accepts all QMediaObject classes, not only QCamera, so it may be possible to record if Qt can play the url."
  Well. I will try again. May be i missed some minor mistake that breaks everything.

[Stuhalsky Alex]

@jsulm

• "Can you play the stream in your Qt app?"
  Yes, i can. Simply passing rtsp url as media for QMediaPlayer and setting video output into QVideoWidget.

[AlexRNL]

@Stuhalsky-Alex

Hello, I've stumbled upon your topic after running into the same issue. I'd like to dispaly and record a stream from a camera on the network. But, while I can display effortlessly the stream with a MediaPlayer widget, QMediaRecorder does not appear to support the recording of the stream from QMediaPlayer even though it implements QMediaContent.

Did you ever find a way to make it work? Or have you used a workaround?

Thanks,
Alex.

[Stuhalsky Alex]

@AlexRNL Hi.
I haven't found a solution and skipped this task. I will turn back to it later, but not soon i guess :)

[SGaist]

Hi,

Did you check with Qt 6.2 ?

[Stuhalsky Alex]

@SGaist Hi.
No i haven't. I can't switch to Qt6 for now so i didn't try that option.

[SGaist]

You can try to cheat by using a custom GStreamer pipeline that does both.

[AlexRNL]

@Stuhalsky-Alex I can't switch to Qt 6 yet, I'm stuck with 5.12

I have alternatives ways to record the stream, but using a QMediaRecorder seemed easy enough to set-up and as it is well-integrated into Qt it made everything easier.

I'll try to have a look at GStreamer to see if it can workaround this issue.

Thanks for your answer anyway :)