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• How to use the QMediaPlayer module to connect to a rtsp stream ?

  19 juin 2023, par Daniela

  I'm creating an RTSP stream using FFmpeg :

  


  ffmpeg -f gdigrab -framerate 30 -probesize 100M -i title="" -c:v libx264 -preset veryfast -maxrate 1000k -bufsize 1000k -pix_fmt yuv420p -g 50 -c:a aac -b:a 128k -f rtsp -rtsp_transport udp rtsp://...129:8554/stream


  


  and trying to connect to it using the Qt module QMediaPlayer.

  


  It stuck for many seconds when it read the line
player->setSource(QUrl("rtsp://....129:8554/stream"));

  


  and then debug this message :

  


  qt.multimedia.ffmpeg.mediadataholder: AVStream duration -9223372036854775808 is invalid. Taking it from the metadata


  


  Also, connect(player, &QMediaPlayer::errorOccurred print :

  


  Error: "Invalid argument"

  


  class MediaPlayer : public QObject
{
    Q_OBJECT
public:
    MediaPlayer (QObject* parent = nullptr) : QObject(parent)
    {
        player = new QMediaPlayer;
        player->setSource(QUrl("rtsp://....129:8554/stream"));
        connect(player, &QMediaPlayer::errorOccurred, this, [this](QMediaPlayer::Error error, const QString& errorString)
        {
            qDebug() << "Error:" << errorString;
        });

        videoWidget = new QVideoWidget;
        player->setVideoOutput(videoWidget);

        videoWidget->show();
        player->play();
    }

private:
    QMediaPlayer* player;
    QVideoWidget* videoWidget;
};


  


  Testing the exactly same streamUrl on vlc does work correctly.
I'm using Qt 6.6, and Win10. ffmpeg 6.0

  


  How I could debug this ?

  


• AttributeError : module 'ffmpeg' has no attribute 'load'

  23 avril 2023, par az-purplepen

  I'm having difficulty with ffmpeg. I've installed it properly (I think) but still get AttributeErrors.

  


  I used the online guide (https://ffmpeg.org/download.html), and doing pip install ffmpeg-python instead of pip install ffmpeg. I've verified the installation with pip show. I've also made sure to not name my files ffmpeg.py.

  


  However, when I try running the following commands in terminal, I get an Attribute Error. Any tips ? I've seen this question pop up before, but none of the tips have worked.

  


  >>> import ffmpeg&#xA;>>> ffmpeg.load(&#x27;cover.wav&#x27;)&#xA;Traceback (most recent call last):&#xA;  File "<stdin>", line 1, in <module>&#xA;AttributeError: module &#x27;ffmpeg&#x27; has no attribute &#x27;load&#xA;</module></stdin>

  


• TypeError at /api/v1/file/86370b91-8e25-4833-bbc6-a4b833363893/ 'module' object is not callable

  16 avril 2023, par Olyx

  Please help me, I'm writing a patch request that should change the video resolution, but I can't get the file back from celery
views.py

  


  def patch(self, request, id = None):
    file = File.objects.get(id = id)
    width =  request.data.get('width')
    height = request.data.get('height')
    file.width = width
    file.height = height 
   
    file.video = change_video_extension.delay(file.video.path, width, height).get()
    file.save()
    return Response({'width':width, 'height':height})


  


  tasks.py

  


  import os
from demo.celery import app

@app.task(name = "change_video_extension")
def change_video_extension(input_file, width, height):
    output_file = "abc123.mp4"
    os.system(f"ffmpeg -i {input_file} -s {width}x{height} {output_file}")
    return output_file


  


  TypeError

  


  TypeError at /api/v1/file/86370b91-8e25-4833-bbc6-a4b833363893/
'module' object is not callable
Request Method : PATCH
Request URL : http://127.0.0.1:8000/api/v1/file/86370b91-8e25-4833-bbc6-a4b833363893/
Django Version : 4.2
Exception Type : TypeError
Exception Value :
  
'module' object is not callable