本次解答以《毒液：致命守护者》预告片为视频材料进行解答。
1、百度搜索视频转换器，找到“迅捷视频转换器”，点击下载。
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下载完成后，进行安装。
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2、在爱奇艺视频的官网中下载爱奇艺视频客户端，然后将软件安装到电脑上，安装完成后打开软件搜索《毒液：致命守护者》，然后下载预告片；
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3、爱奇艺客户端下载视频的默认地址是D:\qycache\download。
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4、运行视频转换器，然后点击格式转换器左上角的添加文件或者点击添加文件夹，将桌面上的《毒液：致命守护者》的预告片QSV格式视频添加到软件中，此软件也支持拖拽添加文件；
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5、点击格式转换器左下角的保存地址，然后选择“自定义”按钮，再点击黄颜色的文件夹图标，软件弹出选择保存地址对话框，选择保存到桌面上，软件默认保存至QSV文件同位置；
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6、点击格式转换器右上角的“输出格式”，然后在输出格式中点击“音频”中的第一个格式“MP3”，选择之后，右边有四个音频品质，只需选择“MP3同原文件”即可；
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7、如果需要针对视频或者音频文件设置更详细的参数，可以点击“编辑”按钮，在其中可以设置更多的参数，不过参数设置的越多，数值越大，最后输出的视频文件就越大；
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8、点击软件右下角的“开始转换”即可一键转换所有的文件。
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9、转换之前文件格式为QSV，而转换之后文件格式为MP3音频或者MP4、MKV等视频格式，前者只能使用特定的播放器播放，而后者则可以在任意的音视频播放器中播放。
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