Re: QTJava and MPEG2 component

Subject: Re: QTJava and MPEG2 component

From: "Greg Ewing" <email@hidden>

Date: Wed, 30 Aug 2006 13:46:56 +1000

Delivered-to: email@hidden

> The main problem with our program is that it is using the Swing display option rather than AWT (as used by Duke Movie), which seems to give a large performance hit.

The lightweight display option suffers a massive performance hit unfortunately. I have, however, had no trouble using an AWT component just for the movie player with lightweight Swing components everywhere else. I know it is not recommended but I had no option and, having combined the two in the past, I was fairly confident that I could pull it off. The only workarounds I have needed to employ are using 'lightweightPopupEnabled' on menus and tooltips otherwise they can disappear below the heavyweight component and I also needed to implement a WindowAdapter to invoke a 'movie.setActive(true); movie.task(0); setVisible(true); pack() combination on a 'windowDeiconified' event and a 'movie.setActive(false)' on a 'windowIconified' event. If I don't override these WindowAdapter events then the heavyweight player shows white space (i.e. no movie) after minimising and maximising the parent JFrame.

Just to give you some idea of the amount of Swing I am using - my application comprises a JFrame containing a JMenu, JSplitPanes, JTabbedPanes, JTrees, JToolBar, JTables and JDialogs. The heavyweight QTComponent is embedded in a JPanel among all of these lightweight components. It smoothly renders 2.5 Gb files of mpeg4-encoded Australian Rules Football (typically around 3200kb/s at 25fps) and is in heavy daily use.

Obviously you will not be able to use a heavyweight movie player if you are using an MDI format with InternalFrames.

I also found that rendering a movie via SMIL hampered performance too much even with the heavyweight movie player. This may have been due to some implementation issues though. Hope this helps.

GREG

--
Greg Ewing
Software Engineer
Champion Data
Suite 4, 51 City Road
Southbank 3006
Victoria Australia
P: 61 3 9693 1333
W: www.championdata.com.au
E: email@hidden

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