some more mpeg encoders + params for higher quality

tutorial/t8.geo

@@ -117,16 +117,25 @@ For num In {1:255}
   EndFor
 
   If(num == 3)
-    // We could make a system call here to generate the mpeg animation
-    // (uncomment the following if mpeg_encode is installed on your
-    // computer):
-    // System "mpeg_encode t8.par";
+    // Here we could make a system call to generate a movie. For example,
 
-    // We could also call whirlgif to create an animated gif file:
+    // with whirlgif:
+    //
     // System "whirlgif -minimize -loop -o t8.gif t8-*.gif";
 
-    // Or, we could call mencoder to create an mpeg4 movie:
-    // System "mencoder 'mf://*.jpg' -mf fps=5 -o t8.mpg -ovc lavc vcoldec=mpeg4:vhq";
+    // with mpeg_encode:
+    //
+    // System "mpeg_encode t8.par";
+
+    // with mencoder:
+    //
+    // System "mencoder 'mf://*.jpg' -mf fps=5 -o t8.mpg -ovc lavc -lavcopts vcodec=mpeg1video:vhq";
+    // System "mencoder 'mf://*.jpg' -mf fps=5 -o t8.mpg -ovc lavc -lavcopts vcodec=mpeg4:vhq";
+
+    // with ffmpeg:
+    //
+    // System "ffmpeg -hq -r 5 -b 800 -vcodec mpeg1video -i t8-%02d.jpg t8.mpg"
+    // System "ffmpeg -hq -r 5 -b 800 -i t8-%02d.jpg t8.asf"
   EndIf
 
 EndFor

tutorial/t8.par

@@ -12,22 +12,36 @@ BASE_FILE_FORMAT JPEG
 # BASE_FILE_FORMAT YUV
 # YUV_SIZE         320x240
 
-GOP_SIZE         30
+GOP_SIZE         1
+# GOP_SIZE         30
+
 SLICES_PER_FRAME 1
+
 PIXEL            HALF
+
 RANGE            10
+
 PSEARCH_ALG      TWOLEVEL
 # PSEARCH_ALG      LOGARITHMIC
+
 BSEARCH_ALG      CROSS2
-IQSCALE          8
+
+IQSCALE          1
+# IQSCALE          8
+
 PQSCALE          10
+
 BQSCALE          25
-REFERENCE_FRAME  ORIGINAL
+
+REFERENCE_FRAME  DECODED
+# REFERENCE_FRAME  ORIGINAL
 
 OUTPUT           t8.mpg
 
 INPUT_CONVERT   *
+
 INPUT_DIR       .
+
 INPUT
 t8-*.jpg [01-50]
 # t8-*.ppm [01-50]