1.8.0 Release Note

Changelog

• XAudio2 support
• VideoToolbox hardware decoder(OSX) support. It can decode h264, h263, mpeg1, mpeg2, mpeg4. Better than VDA
• CUDA 0-copy support
• Dynamic video decoder switch when playing (try it in QMLPlayer)
• Embedded ass subtitles support
• ass subtitle font setup
• No OpenGL build fix for linux
• Fix qpainter rendering if vbo is used
• Fix OpenGL rendering for some rgb formats
• DXVA 0-copy improvement, intel clearvideo workaround etc.
• AO: add null backend
• HW: fix profile check
• Ref counted frames from ff decoders. This fix opengl crash when uploading textures
• Fix audio resampler parameters not set correctly
• VS2015 support

XAudio2

XAudio2 is a lower-level audio API for Microsoft Windows. It can work on almost all windows platforms, from xp to win10, and windows phone, xbox. Windows phone, win8 and later natively support XAudio2. It will be used as the default audio renderer. To work on windows <= 7, you have to install XAudio2 driver from DirectX SDK, you can download here http://sourceforge.net/projects/qtav/files/depends/DXSDK2010_XAudio2_redist.7z/download

Now you can build QtAV without OpenAL. QtAV supports to build XAudio2 with any mingw/msvc toolchain for both XAudio<=2.7 (old API, used in win7 and older) and XAudio>=2.8. QtAV can detect the highest XAudio2 runtime support at runtime and use it if possible.

CUDA 0-copy

The implemention is different from NVIDIA’s example. No player supports this feature now except QtAV. The performance is improved but still worse than DXVA 0-copy.

CPU usage (sintel_4k.mov from https://download.blender.org/durian/movies/ + GT750M)

Details: http://www.qtav.org/blog/cuda_0_copy.html

Font Setup

https://github.com/wang-bin/QtAV/wiki/libass-Font-Setup