QTMultimedia FFMPEG backend preview

[sethsource]

On Linux, this code displays an RTSP stream. and I know that ffmpeg supports this, as i've created a .NET program using ffmpeg to do something similar. I just want to make this with QT/QML

import QtQuick
import QtMultimedia
import QtQml.Models 2.3
Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("CSACamera")
    color: "#000000"
    Video {
            id: stream
            anchors.fill: parent
            focus: true
            source: "rtsp://admin:CSACamera18@192.168.2.18/h264_stream"
            opacity: 1.0
            fillMode: Image.Stretch
            muted: true
            onStopped: stream.play()
            Timer {
                    interval: 300000; running: true; repeat: true
                    onTriggered: {
                        console.log("Log: Refresh")
                        stream.stop()
                        stream.source="rtsp://admin:CSACamera18@192.168.2.18/h264_stream"
                        stream.play()
                    }
                }
//            onErrorChanged: {
//                console.log("VIDEO ERROR")
//                stream.stop()
//                stream.source="rtsp://admin:CSACamera18@192.168.2.18/h264_stream"
//                stream.play()
//            }

            Text {
                id: text1
                width: 73
                height: 18
                color: "#ffffff"
                text: qsTr("Audio: False")
                anchors.left: parent.left
                anchors.top: parent.top
                font.pixelSize: 15
                anchors.leftMargin: 0
                anchors.topMargin: 0
            }

            Keys.onPressed: (event)=> {
                if(event.key === Qt.Key_M) {
                    if(text1.text === "Audio: True") {
                        text1.text = "Audio: False"
                        stream.muted = true
                    } else if (text1.text === "Audio: False") {
                        text1.text = "Audio: True"
                        stream.muted = false
                    }
                }
            }
    }
}

[sethsource]

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[sethsource]

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[sethsource]

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[sethsource]

buimp .

[SGaist]

Hi,

Did you check whether the plugin was deployed ?
If not, did you try to build it yourself ?

[sethsource]

@SGaist How would i check to see if it's deployed? and also there's no instructions anywhere on how to build the preview with FFMPEG included

[JoeCFD]

@sethsource from Qt6.5, FFMPEG comes as default. Check the folder /plugins/multimedia and you will be able to see the plugin is there. If you use Qt6.4, you have to set QT_MEDIA_BACKEND. From all changes they are making, you may not be surprised by issues. Qt6.5 is under beta and Qt6.6 is under dev. I guess you have to be patient with this app.

[sethsource]

QT6.4 didnt work with FFMPEG out of the box, as well as 6.6. I'll try 6.5.

[sethsource]

Okay now we're getting somewhere. QT6.5 with msvc allows me to run my program without yelling at me. only thing now is it seems it wants me to specify a "decoding framework". heres the output:

Cant seem to find any environment variables on the internet that i can use.

Available HW decoding frameworks:
dxva2
d3d11va

[sethsource]

I read on an ffmpeg forum that people make the use of dxva2 and d3d11va through a command line argument for video...
"ffmpeg -hwaccel dxva2 -threads 1 -i INPUT -f null - -benchmark"

but this is completely unrelated to QT. I attempted to use an envar for hwaccel and using command line arg and no difference.