How to display Gstreamer video using vaapisink inside QVideoWidget by QMediaPlayer?

tungnh

I'm using Qt5.12 and gcc+-8 on Debian 11, desktop is Weston compositor. Gstreamer version is 1.0. I want to display a video by Gstreamer with vaapisink renderer on a QVideoWidget by QMediaPlayer on my application.

There is an example on this site QMediaPlayer example

player = new QMediaPlayer;
videoWidget = new QVideoWidget;
videoWidget->show();
player->setVideoOutput(videoWidget);
player->setMedia(QUrl("gst-pipeline: videotestsrc ! xvimagesink name=\"qtvideosink\""));
player->play();

I've tried this and video can run ok inside QVideoWidget. But when I tried with my video from Jellyfish and with vaapisink filter, video is displayed outside the QVideoWidget. The QVideoWidget only shows black. My code is like:

player = new QMediaPlayer;
videoWidget = new QVideoWidget;
videoWidget->show();
player->setVideoOutput(videoWidget);
player->setMedia(QUrl("gst-pipeline: filesrc location=jellyfish-10-mbps-hd-h264.mkv ! matroskademux ! h264parse ! vaapih264dec ! vaapisink name=\"qtvideosink\"));
player->play();

Do you know this problem and how to fix this?

SGaist

Hi and welcome to devnet,

Probably related to QTBUG-91677.

tungnh

@SGaist Thanks for your support. I've seen the link you sent. Actually, my problem is more related to how to use GStreamer pipeline through setMedia method of QMediaPlayer.

SGaist

The common point between the two is the use of the vaapisink hence my suggestion.