Adjust video frame cache number to GOP x 2

Signed-off-by: Leo Ma <begeekmyfriend@gmail.com>

app/src/main/java/net/ossrs/sea/SrsEncoder.java

@@ -209,7 +209,7 @@ public class SrsEncoder {
 
     public void onGetYuvFrame(byte[] data) {
         // Check if the networking is good enough.
-        if (publisher.getVideoFrameCacheNumber() < VGOP * 3) {
+        if (publisher.getVideoFrameCacheNumber() < VGOP * 2) {
             preProcessYuvFrame(data);
             ByteBuffer[] inBuffers = vencoder.getInputBuffers();
             ByteBuffer[] outBuffers = vencoder.getOutputBuffers();
@@ -551,4 +551,4 @@ public class SrsEncoder {
         }
         return sb.toString();
     }
-}
+}