So there was a Chinese post stating this problem pretty much at the meantime of the initiation of this post. I later have tried a few ways and found the solution by building ffmpeg-git with customization of PKGBUILD file. Then I wrote the solution here in Chinese: 不能播放samba中的视频，貌似和ffmpeg有关 - #4 by Wieczorkiewicz
You can find the solution by pasting it into any translate software, then it’s all cakewalk.