开启追帧，增加最大缓冲大小1024kb

Change-Id: I292a7b89b4af0927d3f82e5e385062b9d28b4900

Author: SundoggyNew

sdkdemo/src/main/java/com/tencent/iot/explorer/link/demo/video/preview/VideoPreviewActivity.kt

@@ -431,7 +431,8 @@ class VideoPreviewActivity : VideoBaseActivity(), EventView, TextureView.Surface
 
             it.setOption(IjkMediaPlayer.OPT_CATEGORY_FORMAT, "analyzemaxduration", 100)
             it.setOption(IjkMediaPlayer.OPT_CATEGORY_FORMAT, "probesize", 25 * 1024)
-//            it.setOption(IjkMediaPlayer.OPT_CATEGORY_PLAYER, "packet-buffering", 0)
+            it.setOption(IjkMediaPlayer.OPT_CATEGORY_PLAYER, "packet-buffering", 0)
+            it.setOption(IjkMediaPlayer.OPT_CATEGORY_PLAYER, "max-buffer-size",1024); //最大缓冲大小,单位kb
             it.setOption(IjkMediaPlayer.OPT_CATEGORY_PLAYER, "start-on-prepared", 1)
             it.setOption(IjkMediaPlayer.OPT_CATEGORY_CODEC, "threads", 1)
             it.setOption(IjkMediaPlayer.OPT_CATEGORY_PLAYER, "sync-av-start", 0)