How to play raw video data in Qt

[Prashant_Ben]

Hi, i am new to Qt and i want to know how can i play a raw video(.yuv) frames by frame in qt, i don't want to pass the file path or url to qt, just the buffer containing video data.
Thanks in advance

[SGaist]

Hi and welcome to devnet,

How are you getting the data from the video file ?

[Prashant_Ben]

Thanks for the reply @SGaist.
Actually i am having a ts stream(which contains my video), which i am decoding externally and not in Qt, the decoded output i am taking in buffer and want to pass that buffer to Qt.

[SGaist]

What format is that buffer ?
What library are you using to decode the file ?

[Prashant_Ben]

Hi @SGaist ,
-> raw video data format is yuv420p.
-> i am going to use libavcodec(FFmpeg) to decode the file.

I tried a small sample yesterday but couldn't get on how to set the raw data format, here it is:

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QFile file("/out.yuv");    //this is just for sample, will not be there in actual app
    file.open(QIODevice::ReadOnly);
    QByteArray arr = file.readAll(); 

    QMediaPlayer *player = new QMediaPlayer(&a);

    QBuffer *buffer = new QBuffer(player);
    buffer->setData(arr);
    buffer->open(QIODevice::ReadOnly);

    player->setMedia(QMediaContent(),buffer);

    player->play();

    return a.exec();
}

[SGaist]

Then also use it to convert the YUV frame into an RGB frame. Or maybe consider the QtAV project.

[kuzulis]

Or, to use the libvlc wrappers, e.g. vlc-qt