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POVideo with QML Video plays choppy on Mac OS X
 

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    <p>I’m trying to create simple video player with QML. I have QtSdk installed and QtMobility compiled and installed from source. Then I put this simple video playing code to main qml file:</p> <pre><code>import QtQuick 1.0 import QtMultimediaKit 1.1 Item{ width: 400; height: 300 Video { id: video source: "d:/Projects/Serenity - HD DVD Trailer.mp4" anchors.fill: parent MouseArea { anchors.fill: parent onClicked: { video.play() } } } } </code></pre> <p>After compiling and running application, video plays choppy and on exiting application it puts this in log:</p> <pre><code>2011-06-07 11:13:44.055 video-player[323:903] *** __NSAutoreleaseNoPool(): Object 0x10225ea60 of class NSCFNumber autoreleased with no pool in place - just leaking 2011-06-07 11:13:45.007 video-player[323:903] *** __NSAutoreleaseNoPool(): Object 0x10264f030 of class __NSCFDate autoreleased with no pool in place - just leaking 2011-06-07 11:13:45.007 video-player[323:903] *** __NSAutoreleaseNoPool(): Object 0x11a409000 of class NSCFTimer autoreleased with no pool in place - just leaking 2011-06-07 11:13:45.008 video-player[323:903] *** __NSAutoreleaseNoPool(): Object 0x11a43e550 of class NSCFArray autoreleased with no pool in place - just leaking 2011-06-07 11:13:45.008 video-player[323:903] *** __NSAutoreleaseNoPool(): Object 0x11a462560 of class __NSFastEnumerationEnumerator autoreleased with no pool in place - just leaking </code></pre> <p>If any way to make it playing smoothly and to prevent memory?</p>
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    1. COYou can get rid of the autorelease pool messages by creating a new autorelease pool at the beginning of your application, e.g. `NSAutoreleasePool *pool = [NSAutoreleasePool new];`
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    2. COWhat is the bit rate of the content file and have you tried one with a lower bit rate? I noticed a performance issue with the QML Video item on Ubuntu which I did not have when I used a QVideoWidget. If I recall correctly, I concluded that it could have been because the video renders to the underlying QGraphicsVideoItem in the QML case, while in the widget case it makes use of GStreamer's xvimagesink - so basically a case of rendering to a surface vs. rendering to a window. I don't know which backend Mac OS X uses but perhaps the performance issue is cross-platform.
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    3. COhave you tried other file formats ? what are the results ?
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