change demo video to 200kbps

@@ -36,7 +36,7 @@ FMS URL: rtmp://127.0.0.1:1935/live
 Stream:  livestream
 For example, use ffmpeg to publish:
     for((;;)); do \
-        ./objs/ffmpeg/bin/ffmpeg -re -i ./doc/source.flv -vcodec copy -acodec copy \
+        ./objs/ffmpeg/bin/ffmpeg -re -i ./doc/source.200kbps.768x320.flv -vcodec copy -acodec copy \
         -f flv -y rtmp://127.0.0.1:1935/live/livestream; \
         sleep 1; \
     done

@@ -28,8 +28,8 @@ vhost __defaultVhost__ {
             vcodec          libx264;
             vbitrate        300;
             vfps            20;
-            vwidth          1152;
-            vheight         480;
+            vwidth          768;
+            vheight         320;
             vthreads        1;
             vprofile        baseline;
             vpreset         superfast;
@@ -51,8 +51,8 @@ vhost __defaultVhost__ {
             vcodec          libx264;
             vbitrate        500;
             vfps            20;
-            vwidth          1152;
-            vheight         480;
+            vwidth          768;
+            vheight         320;
             vthreads        1;
             vprofile        main;
             vpreset         fast;
@@ -81,8 +81,8 @@ vhost mirror.transcode.vhost.com {
             vcodec          libx264;
             vbitrate        300;
             vfps            20;
-            vwidth          1152;
-            vheight         480;
+            vwidth          768;
+            vheight         320;
             vthreads        2;
             vprofile        baseline;
             vpreset         superfast;
@@ -111,8 +111,8 @@ vhost drawtext.transcode.vhost.com {
             vcodec          libx264;
             vbitrate        300;
             vfps            20;
-            vwidth          1152;
-            vheight         480;
+            vwidth          768;
+            vheight         320;
             vthreads        2;
             vprofile        baseline;
             vpreset         superfast;
@@ -141,8 +141,8 @@ vhost crop.transcode.vhost.com {
             vcodec          libx264;
             vbitrate        300;
             vfps            20;
-            vwidth          1152;
-            vheight         480;
+            vwidth          768;
+            vheight         320;
             vthreads        2;
             vprofile        baseline;
             vpreset         superfast;
@@ -171,8 +171,8 @@ vhost logo.transcode.vhost.com {
             vcodec          libx264;
             vbitrate        300;
             vfps            20;
-            vwidth          1152;
-            vheight         480;
+            vwidth          768;
+            vheight         320;
             vthreads        2;
             vprofile        baseline;
             vpreset         superfast;
@@ -220,9 +220,9 @@ vhost all.transcode.vhost.com {
             # video framerate.
             vfps            25;
             # video width, must be even numbers.
-            vwidth          1728;
+            vwidth          768;
             # video height, must be even numbers.
-            vheight         720;
+            vheight         320;
             # the max threads for ffmpeg to used.
             vthreads        12;
             # x264 profile, @see x264 -help, can be: