It really depends what version of ffmpeg you are using. The latest git version says this:
encoder 'vorbis' is experimental and might produce bad results. Add '-strict experimental' if you want to use it. Or use the non experimental encoder 'libvorbis'.
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这实际上取决于您使用的 ffmpeg 版本。最新的 git 版本是这样说的：
当我尝试时：
效果很好。
It really depends what version of ffmpeg you are using. The latest git version says this:
When I try:
It works fine.