Your iterator becomes invalid after you remove items from a container while iterating it. Try this:
QList<int> keys = m_FrameBuffer.keys();
foreach (int key, keys)
{
int diff = frameNumber - key;
if (diff >= 5)
{
qDebug() << "DELETE ==> Key:" << key
<< "Value:" << m_FrameBuffer.value(key)
<< "Difference: " << diff;
int removed = m_FrameBuffer.remove(key);
qDebug() << "Removed this many: " << removed;
}
}
Also you can use QMutableHashIterator
for it:
QMutableHashIterator<int, Frame*> it(m_FrameBuffer);
while (it.hasNext())
{
it.next();
int key = it.key();
int diff = frameNumber - it.key();
if (diff >= 5)
{
qDebug() << "Items to be removed:"
<< m_FrameBuffer.values(it.key()).size();
it.remove();
}
}