omxplayer exits with 15s delay when launched using QProcess

Question

In my Qt5.9.2 under RPi3 I launch omxplayer in the following way:

QProcess *_omx = new QProcess(this);

void MyQPlayer::play(QString uri)
{
    QStringList args;
    args << "-o" << "0" << "-i" << "0";
    args << "omxplayer";
    args << "--vol=-6000";
    args << "-I" << "-s";
    args << "-o" << "hdmi" << uri;
    _omx->start("stdbuf", args, QProcess::Unbuffered | QProcess::ReadWrite);
}

I need to use stdbuf to avoid buffering, otherwise I cannot read in "real-time" the output from the application.

When the video ends, omxplayer should exits immediately - and it does when I launch it from command line:

$ stdbuf -o 0 -i 0 omxplayer --vol=6000 -I -s -o hdmi myfile.mp4

Instead, when launched from my application, once the video has ended it remains in execution for about 15s before exits. I catch the finished() signal and it confirms it exited nicely: exit code = 0 and exit status = NormalExits.

I'm not sure if this other information is useful or is completely another issue, but I report here anyway. To pause the video I send on the pipe the letter 'p':

void MyPlayer::pause()
{
    qDebug() << "toggle pause";
    if (_omx->state() == QProcess::Running)
    {
        _omx->write("p");
    }
}

the debug print tells me the function is actually called every time I invoke the function, but often I need to call it multiple times to actually pause or resume the video execution.

It should not be an issue with buffering because my command line should avoid that.

Good point. Not yet. I'm going to try it as soon as possible. — Mark, Jun 12 '18 at 17:33
Try to use [PiOmxTextures](https://github.com/carlonluca/pot). It's much more convenient than omxplayer for RPi. — eska2000, Jun 13 '18 at 12:36
@eyllanesc as far as I understand omxplayer is not available for other architectures but the RPi one. — Mark, Jun 27 '18 at 05:42
@eska2000 I'm going to give it a try, but I would understand why this doesn't work. — Mark, Jun 27 '18 at 05:42
@Mark You can download [complete image](http://thebugfreeblog.blogspot.com/2015/11/fully-optimised-raspbian-jessie-with.html) with compiled player. It must work. — eska2000, Jun 28 '18 at 11:48

omxplayer exits with 15s delay when launched using QProcess

0 Answers0