首先了解一下Unity在进行AssetBundle打包时的几种构建方式：

• BuildAssetBundleOptions.None：默认构建AssetBundle的方式。使用LZMA算法压缩，此算法压缩包小，但是加载时间长，而且使用之前必须要整体解压。解压以后，这个包又会使用LZ4算法重新压缩，这样这种包就不要对其整体解压了。（也就是第一次解压很慢，之后就变快了。
• BuildAssetBundleOptions.UncompressedAssetBundle：不压缩数据，包大，但是加载很快。
• BuildAssetBundleOptions.ChunkBaseCompression：使用LZ4算法压缩，压缩率没有LZMA高，但是加载资源不必整体解压。

而在安卓手机上加载AssetBundle中的视频资源时的报错就是由于unity在打包AssetBundle时对视频资源进行了压缩。

AndroidVideoMedia::OpenExtractor could not translate archive:/CAB-78qwdyh8739dh8uf02332dd686137/CAB-5b4cd5489dv87h2s93r7de1548fr7.resource to local file. Make sure file exists, is on disk (not in memory) and not compressed.
AndroidVideoMedia: Error opening extractor: -10004

解决方案一：对视频资源打包时不进行压缩，采用

BuildPipeline.BuildAssetBundles(…, BuildAssetBundleOptions. UncompressedAssetBundle,.. );

假如视频资源较大会导致游戏热更时需要下载的资源包体积也较大。

解决方案二：视频资源放服务器，在游戏中用代码动态下载视频到本地播放。

 

UIPlayVideo.lua.txt

local Parent = require("Manager/XYObj")
local CLASSNAME = "UIPlayVideo"
local CurObj = class(CLASSNAME,Parent)
local UiLayerConf = require "Manager/UiLayerConf"
local LoadVideoTool = require "Tool/LoadVideoTool"function CurObj:ctor(CLASSNAME,CSharpObj)CurObj.super.ctor(self,CLASSNAME,CSharpObj)self.m_bUiLayerType = UiLayerConf.ui_type_dlg
end--初始化
function CurObj:OnInit()btnClose.onClick:AddListener(function ()self:playVideoFun(videoConst.stop)ObjMgr:CloseUI("UIPlayVideo")end)
end--每次展示执行一次
function CurObj:OnShow()print("播放界面展示---")self:playVideoFun(videoConst.play)btnClose.gameObject:SetActive(false)self:invoke(function ()btnClose.gameObject:SetActive(true)end , 5)self:invoke(function ()ObjMgr:CloseUI("UIPlayVideo")end , 23)
endfunction CurObj:playVideoFun(state)if state == videoConst.play thenlocal url = "video_url_temp"objVideoCom.url = urllocal succCallback = function(args)objVideoCom.url = argsobjVideoCom:Play()endlocal failCallback = function(...)ObjMgr:ShowTips("播放失败")endLoadVideoTool:LoadVideoUrl(url,succCallback,failCallback)elseobjVideoCom:Stop()end
endvideoConst = {play = 1,stop = 2
}

LoadVideoTool.lua.txt

local LoadVideoTool={}
local cs_coroutine = require "XLua/Common/cs_coroutine"
local crypt = require "crypt"
local UnityWebRequest =	CS.UnityEngine.Networking.UnityWebRequest
local File=CS.System.IO.Filelocal FuncEncodeURI
local FuncGetPlatformPath
local pathfunction LoadVideoTool:LoadVideoUrl(url,succCallback,failCallback)if not url or url == "" thenprint("error:输入的URL错误！")LoadFailCall(failCallback)returnendif not path thenpath = FuncGetPlatformPath()endlocal urlEncode = FuncEncodeURI(url)urlEncode  = path .. "/" .. urlEncode..".mp4"if File.Exists(urlEncode) then-- 从本地加载--print("----------本地加载------------",url,urlEncode)if succCallback thensuccCallback(urlEncode)endelse --按网址下载--print("----------网上加载------------")cs_coroutine.start(function  ()local webRequest = UnityWebRequest.Get(url)webRequest.method = UnityWebRequest.kHttpVerbGETcoroutine.yield(webRequest:SendWebRequest())if (not webRequest.isNetworkError and webRequest.responseCode == 200) thenFile.WriteAllBytes(urlEncode,webRequest.downloadHandler.data)if succCallback thensuccCallback(urlEncode)endelseprint("errorVideo : ",webRequest.error)LoadFailCall(failCallback)endend)end
end-- 加载失败设置
LoadFailCall = function(failCallback)if failCallback thenfailCallback()end
end--- 根据平台 获取 路径
FuncGetPlatformPath = function()return CS.UnityEngine.Application.temporaryCachePath
end--- 网址中的特殊字符转换
FuncEncodeURI = function (s)return crypt.base64encode(s)
endreturn LoadVideoTool