在php中能通过一个视频的url，得到他的播放长度吗
在php中能通过一个视频的url，在不打开视频的情况下，得到他的播放长度吗？
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在php中能通过一个视频的url，在不打开视频的情况下，得到他的播放长度吗？
视频格式的长度属于视频的属性，一般包含在视频封装格式的头部标签中，并且不同的视频封装格式头部标签格式也不相同。
URL只是提供资源的定位，不会提供资源的内部属性。
除非这个URL中包含了视频播放长度信息，否则你将无从获取。
每个格式的视频文件都有视频长度的信息，吧视频文件下载到本地，然后解析二进制文件。
php_ffmpeg
一般来说直接通过URL是无法拿到视频的相关信息的，你要么根据视频网站的API根据视频的ID获取视频的相关信息，要么就把视频直接下载下来利用PHP-FFMpeg(https://github.com/PHP-FFMpeg/PHP-FFMpeg#ffprobe)获取到视频的时间，为了避免以后重复下载，可以把相关信息存储下来，碰到下载过的就直接读取不用下载获取了。
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