DirectShowPlayerService::doSetUrlSource: Unresolved error code
Qt 编译后不能播放音乐或者视频。spa 通过搜索得知：Qt 中的多媒体播放，底层是使用DirectShowPlayerService，须要一个DirectShow解码器，例如LAV Filters视频 LAV Filters的下载地址以下:http://files.1f0.de/lavf/LAVFilters-0.65.exe编译 将文件下载以后，安装到Qt的安装目录，便可实现MP3的播放，若是
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- 1. error LNK2019: unresolved external symbol
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