Qt qml MediaPlayer/Video 仅再现声音（无视频）

Posted 2023-02-16

【中文标题】Qt qml MediaPlayer/Video 仅再现声音（无视频）

【英文标题】：Qt qml MediaPlayer/Video reproduces only Sound (without Video)

【发布时间】：2018-10-04 14:35:02

【问题描述】：

我在 QML 中使用播放器，安装了 k-lite-codec 包并尝试播放 mp4 和 avi 视频格式，但它不播放它们，只播放声音。 为什么是这样？ 怎么了？

关闭应用程序后，我得到这个调试日志：

D3D11 WARNING: Process is terminating. Using simple reporting. Please call ReportLiveObjects() at runtime for standard reporting. [ STATE_CREATION WARNING #0: UNKNOWN]
D3D11 WARNING: Live Producer at 0x03DBE8CC, Refcount: 8. [ STATE_CREATION WARNING #0: UNKNOWN]
D3D11 WARNING:  Live Object at 0x03E35D18, Refcount: 2. [ STATE_CREATION WARNING #0: UNKNOWN]
D3D11 WARNING:  Live Object at 0x03DBF780, Refcount: 0. [ STATE_CREATION WARNING #0: UNKNOWN]
D3D11 WARNING:  Live Object at 0x03CE68C4, Refcount: 0. [ STATE_CREATION WARNING #0: UNKNOWN]
D3D11 WARNING:  Live Object at 0x03DC56FC, Refcount: 0. [ STATE_CREATION WARNING #0: UNKNOWN]
D3D11 WARNING:  Live Object at 0x03DC58D4, Refcount: 0. [ STATE_CREATION WARNING #0: UNKNOWN]
D3D11 WARNING:  Live Object at 0x03DC5ACC, Refcount: 0. [ STATE_CREATION WARNING #0: UNKNOWN]
D3D11 WARNING:  Live Object at 0x03DC5CC4, Refcount: 0. [ STATE_CREATION WARNING #0: UNKNOWN]
D3D11 WARNING:  Live Object at 0x03DC6184, Refcount: 1. [ STATE_CREATION WARNING #0: UNKNOWN]
D3D11 WARNING:  Live Object at 0x03DC6734, Refcount: 1. [ STATE_CREATION WARNING #0: UNKNOWN]
D3D11 WARNING:  Live Object at 0x03DC6CE4, Refcount: 1. [ STATE_CREATION WARNING #0: UNKNOWN]
D3D11 WARNING: Live                         Object :     10 [ STATE_CREATION WARNING #0: UNKNOWN]
DXGI WARNING: Live Producer at 0x03D1C814, Refcount: 3. [ STATE_CREATION WARNING #0: ]
DXGI WARNING:   Live Object at 0x03D4DCA0, Refcount: 3. [ STATE_CREATION WARNING #0: ]
DXGI WARNING: Live                         Object :      1 [ STATE_CREATION WARNING #0: ]

【问题讨论】：

我用的是标准的例子，我自己的代码和结果都是一样的。标准代码示例：qmlvideo（多媒体）或在我自己的代码中使用：MediaPlayer 和 VideoOutput 或 Video（相同）

【参考方案1】：

由于您提到了 k-lite-codec，我假设您使用的是 Windows。检查是否可以在 Windows Media Player 中播放。如果不是（只有声音），那么您的系统中缺少必要的编解码器。