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QMediaRecorder (Qt Multimedia) .avi file format problem (FPS)

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  • O Offline
    O Offline
    Olivier Duguay
    wrote on 14 Mar 2024, 16:14 last edited by
    #1

    Hi Qt forum,

    I was wondering if I am the only one with problem using the .AVI video format file with the QMediaRecorder.

    My problem is that the FrameRate I get on the file save in .AVI format is always 600.00 frames/second even if I explicitly call those functions :

        QMediaFormat mediaFormat;
        mediaFormat.setFileFormat(QMediaFormat::FileFormat::AVI);
        mMediaRecorder->setMediaFormat(mediaFormat);
        mMediaRecorder->setVideoFrameRate(30);
        qDebug() << Q_FUNC_INFO << mMediaRecorder->mediaFormat().fileFormat() << mMediaRecorder->mediaFormat().videoCodec() << mMediaRecorder->videoFrameRate();
    

    Debugger :
    void __cdecl USBCameraHandler::updateTargetName(class QString) QMediaFormat::AVI QMediaFormat::VideoCodec::Unspecified 30

    If I used .MP4 or any other format, I get the right FPS. Does anyone have any clue ?

    Screen capture of the details of the .AVI video saved :
    format_avi.PNG

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    • S Offline
      S Offline
      SGaist
      Lifetime Qt Champion
      wrote on 14 Mar 2024, 19:37 last edited by SGaist
      #2

      Hi,

      You should add which version of Qt you are using.

      Did you notice that the video codec is Unspecified ? What if you set one ?

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

      O 1 Reply Last reply 4 Apr 2024, 18:43
      0
      • S SGaist
        14 Mar 2024, 19:37

        Hi,

        You should add which version of Qt you are using.

        Did you notice that the video codec is Unspecified ? What if you set one ?

        O Offline
        O Offline
        Olivier Duguay
        wrote on 4 Apr 2024, 18:43 last edited by
        #3

        @SGaist

        Qt Version : 6.2.2 (MSVC 2019, 64 bits)

        Yeah, I realize the video codec is Unspecified, but once I record it get a default one. But even if I especially specify one, I still have the same problem :(

        (I tried pretty much all of the codec listed)

        S 1 Reply Last reply 4 Apr 2024, 18:47
        0
        • O Olivier Duguay
          4 Apr 2024, 18:43

          @SGaist

          Qt Version : 6.2.2 (MSVC 2019, 64 bits)

          Yeah, I realize the video codec is Unspecified, but once I record it get a default one. But even if I especially specify one, I still have the same problem :(

          (I tried pretty much all of the codec listed)

          S Offline
          S Offline
          SGaist
          Lifetime Qt Champion
          wrote on 4 Apr 2024, 18:47 last edited by
          #4

          @Olivier-Duguay can you update to a more recent version of Qt ? Since 6.5, the default backend has been switched to ffmpeg which may give better results.

          Interested in AI ? www.idiap.ch
          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

          1 Reply Last reply
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