empty caps

src/gstreamerextras/qgstreamerappsrc.cpp

@@ -54,7 +54,7 @@ public:
     {
     }
 
-    void restart(QVideoFrame &frame);
+    bool restart(QVideoFrame &frame);
 
 private:
     GstElement *appsrc = nullptr;
@@ -64,11 +64,20 @@ private:
     QSize size;
 };
 
-void QGstreamerAppSrcPrivate::restart(QVideoFrame &frame)
+bool QGstreamerAppSrcPrivate::restart(QVideoFrame &frame)
 {
     QList<QVideoFrame::PixelFormat> cc;
-    cc << frame.pixelFormat();
+    auto format = frame.pixelFormat();
+    if (format == QVideoFrame::Format_ARGB32_Premultiplied)
+        format = QVideoFrame::Format_RGB32;
+
+    cc << format;
     GstCaps *caps = QGstUtils::capsForFormats(cc);
+    if (!caps || gst_caps_is_empty(caps)) {
+        qWarning() << "Could not create caps for" << frame.pixelFormat();
+        return false;
+    }
+
     gst_caps_set_simple(
         caps,
         "framerate", GST_TYPE_FRACTION , 30, 1,
@@ -79,6 +88,7 @@ void QGstreamerAppSrcPrivate::restart(QVideoFrame &frame)
     g_object_set(G_OBJECT(appsrc), "caps", caps, NULL);
     gst_caps_unref(caps);
     size = frame.size();
+    return true;
 }
 
 static void start_feed(GstElement *pipeline, guint size, QGstreamerAppSrc *q)
@@ -128,11 +138,11 @@ void QGstreamerAppSrc::timerEvent(QTimerEvent *event)
         return;
 
     QVideoFrame frame = readFrame();
-    if (!frame.isValid() || !frame.map(QAbstractVideoBuffer::ReadOnly))
+    if (d->size != frame.size() && !d->restart(frame))
         return;
 
-    if (d->size != frame.size())
-        d->restart(frame);
+    if (!frame.isValid() || !frame.map(QAbstractVideoBuffer::ReadOnly))
+        return;
 
     auto app_buffer = gst_buffer_new();
     int size = frame.bytesPerLine() * frame.height();