Media player playlist using PyQT

yanisk

I've some problems making this work. I wanna use playlist to play audio files. here is my code:

playlist = QMediaPlaylist()
url = QUrl.fromLocalFile("/home/user/Downloads/ss.mp3")
playlist.addMedia(QMediaContent(url))


player.setPlaylist(playlist)
player.playlist().setCurrentIndex(0)
player.play()

The problem is that when I feed the file as unique media source (player.serMedia()) it works, but when I run the code above, the music doesn't play!

What's the problem here?

mrjj

Hi
Disclaimer. Not a python user.

Did you try to see if
QMediaPlaylist::error()
says something ?

also
bool QMediaPlaylist::isEmpty() const
or
int QMediaPlaylist::mediaCount() const

to see if list is actually loaded ?

yanisk

@mrjj QMediaPlaylist::error() =0 and QMediaPlaylist::mediaCount() =1 So, I think the playlist is ok. But the player doesn't play its content.

mrjj

Hmm, yes it does sound like something loaded.

You seems to do exactly as
https://meetingcpp.com/index.php/br/items/building-an-mp3-player-with-qt5.html

Is this the same place/ code as when you test (player.setMedia())

I wonder if it runs out of scope or anything like that.

yanisk

When I load a single file, it's fine. like this:

            local = QUrl(audio.url)
            media = QMediaContent(local)
            player.setMedia(media)
            player.play()

But the code for playlist doesn't start the playback.

mrjj

@yanisk
Hmm. Sorry can't spot anything that looks suspicious.

I would have a look at
currentMedia
and see if all looks good inside.

I wonder ifs the QUrl that is the issue but you are using full path so seems fine.

yanisk

When I check

player.play()
print(player.currentMedia().canonicalUrl())

Gives :

PyQt5.QtCore.QUrl('file:///home/user/Downloads/ss.mp3')

Which means the current media is indeed correct, yet the player doesn't start playing it.

mrjj

Hi
This works in c++

void MainWindow::on_pushButton_released() {
  auto player = new QMediaPlayer;
  auto playlist = new QMediaPlaylist(player);
  playlist->addMedia(QUrl::fromLocalFile("e:/1.mp3"));
  playlist->addMedia(QUrl::fromLocalFile("e:/2.mp3"));
  playlist->addMedia(QUrl::fromLocalFile("e:/3.mp3"));
  playlist->setCurrentIndex(1);
  player->setPlaylist(playlist);
  player->play();
}

Its starts playing at once.

yanisk

Thanks man!

Now I see my mistake. It's when I created the playlist object, I didn't provide QMediaplayer player as a parameter. Now, It works!

        playlist = QMediaPlaylist(player)

mrjj

@yanisk
ahh, i totally missed that. good found :)
You had player.setPlaylist(playlist) so i thought it was enough "binding"