warning: Unable to read symbols for "/Developer/Platforms/iPhoneOS.platform/DeviceSupport/3.2 (7B367)/Symbols/System/Library/VideoDecoders/VCH263.videodecoder" (file not found).
warning: Unable to read symbols for "/Developer/Platforms/iPhoneOS.platform/DeviceSupport/3.2 (7B367)/Symbols/System/Library/VideoDecoders/H264H2.videodecoder" (file not found).
warning: Unable to read symbols for "/Developer/Platforms/iPhoneOS.platform/DeviceSupport/3.2 (7B367)/Symbols/System/Library/VideoDecoders/MP4VH2.videodecoder" (file not found).
warning: Unable to read symbols for "/Developer/Platforms/iPhoneOS.platform/DeviceSupport/3.2 (7B367)/Symbols/System/Library/VideoDecoders/JPEGH1.videodecoder" (file not found).
2011-2-28 16:16:15.145 app[3089:207] setting file:///private/var/mobile/Applications/46CE5456-6338-4CCD-B560-DCEFF700ACE0/tmp/MediaCache/在做ipad視頻播放時候遇到的這麼個問題，看了API文檔，文檔給出如下解釋：
Important: In iOS 3.1 and earlier, a movie player always uses a system-supplied audio session.
To obtain that same behavior in iOS 3.2 and newer, you must set this property’s value to NO.
所以在3.2以後的ios系統中需要將
useApplicationAudioSession 設置爲NO；