Show Video on dialog

aim0d

HI! I'm new to QT and I'm trying to understand how to play video.

I'm trying to play a video on a dialog that I open throught "Menubar" in my MainWindow.
When I click on the voice, that it should show my dialog with window, it shows this message on the console: DirectShowPlayerService::doSetUrlSource: Unresolved error code 0x80040216 ()
This is the code in video.cpp:

#include "video.h"
#include "ui_video.h"

#include <QMediaPlayer>
#include <QVideoWidget>

Video::Video(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Video)
{
    ui->setupUi(this);
    setWindowTitle("Video");

    QMediaPlayer *player = new QMediaPlayer;
    QVideoWidget *vw = new QVideoWidget;

    player->setVideoOutput(vw);
    player->setMedia(QUrl::fromLocalFile("Strada.mp4"));

    vw->setGeometry(400,300,300,400);
    vw->show();

    player->play();
}

Video::~Video()
{
    delete ui;
}

And this how I open the dialog in MainWindows.cpp:

void MainWindow::on_actionVideo_triggered()
{
    Video vd;
    vd.exec();
}

What am I doing wrong?

JonB

@aim0d said in Show Video on dialog:

player->setMedia(QUrl::fromLocalFile("Strada.mp4"));

Replace "Strada.mp4" with the full path to that file, and try again. See e.g. https://stackoverflow.com/questions/65886167/how-to-solve-qt-unresolved-error-code-0x80040216

aim0d

@JonB I'm gonna try it, thanks
I just wrote the name of the video because I put it in the project directory and thought it was enought.

jsulm

@aim0d said in Show Video on dialog:

I put it in the project directory and thought it was enought

No, it needs to be in the current working directory of your application if you only wantr to use the file name. By default the build folder where the executable is will be the working directory. But you should never trust such assumptions! So, do not use relative paths but construct the path, see https://doc.qt.io/qt-6/qstandardpaths.html

aim0d

@jsulm I tried changing the path, as u told me (also trying the one in the stackoverflow answer) but still same error :(

aim0d

I dont get it; even if I try this example i get error -> DirectShowPlayerService::doRender: Unresolved error code 0x80040266 ()
And it's the official example from QT

JonB

@aim0d
Since you have the reference and solution of someone who encountered the same, I would guess you are not specifying the full path correctly.

However, you are just as capable as I am of Googling for DirectShowPlayerService::doRender or similar, e.g. https://stackoverflow.com/questions/53328979/directshowplayerservicedorender-unresolved-error-code-0x80040266. Maybe

the problem is caused because the Qt Multimedia DirectShow backend does not support some formats because you do not have the codecs, so the solution is to install those codec

The problem itself is not from Qt but from Directshow which is ultimately the one that reproduces the sound so you will have to look for alternative codecs for DirectShow

aim0d

@JonB

I would guess you are not specifying the full path correctly
If writing the exact same stuff as the example or copy and paste the path isnt enought i dont know what. It's make more sense that i'm doing something else wrong.

for the DirectShowPlayerService::doRender i havent found anything on internet that resolved the problem but found by myself what was the problem: basically the player doesnt read .mp4 files, just .mpg

Google very often offerts to much solution and very rarely the right one, this is why its rarely a good advice to look into it. In the past months i've been jumping between HTML, C++, QT and other stuff so prefered blog and forum like this.

JonB

@aim0d said in Show Video on dialog:

for the DirectShowPlayerService::doRender i havent found anything on internet that resolved the problem but found by myself what was the problem: basically the player doesnt read .mp4 files, just .mpg

Is this not the

the problem is caused because the Qt Multimedia DirectShow backend does not support some formats because you do not have the codecs, so the solution is to install those codec

precisely from the stackoverflow I gave you as an example?

jsulm

@aim0d said in Show Video on dialog:

I tried changing the path, as u told me

Please show the code.
And did you verify that the path you constructed is correct and the file exists at that location?

aim0d

@jsulm I tried changing the type of file (from mp4 to mpg) and it worked.

aim0d

@JonB >precisely from the stackoverflow I gave you as an example?
As I answered to Jsulm, apparently the problem was the extension of the file. If I change it, it works just fine

JonB

@aim0d
You should not be changing extensions of files, you should (presumably) be changing your Windows system settings to cope correctly with the file extensions it does support. Up to you.

aim0d

@JonB I didnt change it manually,. I't the wrong way to do it.
I convert it in the right way. I cannot touch stuff for system, I'm using a work computer