我试图运行其中一个qt示例应用程序,没有任何修改。它被称为player
,它是一个多媒体小部件演示。我的系统是Ubuntu 16.04 64bit。当我尝试播放视频时,我在控制台中看到以下错误:
No decoder available for type 'video/x-h264
尝试两个不同的视频后,这是完整的错误:
Starting /home/aras/Qt5.7.0_Sept2016/Examples/Qt-5.7/multimediawidgets/build-player-Sept2016-Debug/player...
Warning: "No decoder available for type 'video/x-h264, stream-format=(string)avc, alignment=(string)au, level=(string)3, profile=(string)constrained-baseline, codec_data=(buffer)0142e01eff0100192742e01ea9101405ff2e00d418041adb7a00f480f55ef7c04001000428de09c8, width=(int)640, height=(int)360, framerate=(fraction)2997/125, pixel-aspect-ratio=(fraction)1/1'."
Warning: "No decoder available for type 'video/x-h264, stream-format=(string)avc, alignment=(string)au, level=(string)3, profile=(string)constrained-baseline, codec_data=(buffer)0142e01eff0100192742e01ea9101405ff2e00d418041adb7a00f480f55ef7c04001000428de09c8, width=(int)640, height=(int)360, framerate=(fraction)2997/125, pixel-aspect-ratio=(fraction)1/1'."
Warning: "No decoder available for type 'video/x-h264, stream-format=(string)avc, pixel-aspect-ratio=(fraction)1/1, width=(int)1280, height=(int)720, framerate=(fraction)601600/10033'."
我安装了与gstreamer远程相关的所有软件包。当我运行gst-inspect-1.0
时,我得到了很多输出,最后一行是:
Total count: 241 plugins (1 blacklist entry not shown), 1388 features
~$ gst-inspect-1.0 |grep x-h264
typefindfunctions: video/x-h264: h264, x264, 264
:~$ gst-inspect-1.0 avdec_h264
Factory Details:
Rank primary (256)
Long-name libav H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 decoder
Klass Codec/Decoder/Video
Description libav h264 decoder
所以我觉得一切都安装得很好。为什么Qt多媒体示例不能开箱即用?