Bring step 2 speed claim down to earth

README.md

@@ -39,7 +39,7 @@ Doing things in two steps adds a little bit of time,
 but in my experience,
 the hardware transcoder is so much faster,
 the second step time isn't a problem.
-I see ffmpeg reporting running at `speed=500x` and higher
+I see ffmpeg reporting running at `speed=84x` and higher
 on the second step.
 
 # Thanks

h264

@@ -12,7 +12,8 @@ Output will be written to \$SRC.h264.mp4
   -1080p      Rescale to no bigger than 1080p
   -720p       Rescale to no bigger than 720p
   -480p       Rescale to no bigger than 480p
-  -bitrate B  Set average bitrate to B, overriding rescale setting
+  -bitrate B  Set average bitrate to B, overriding rescale setting or CRF
+  -crf C      Set CRF to C, overriding rescale setting or bitrate
   -swenc      Software encode instead of hardware
 EOD
 
@@ -44,6 +45,10 @@ while true; do
       bitrateManual="-b:v $2"
       shift 2
       ;;
+    -crf|--crf)
+      bitrateManual="-crf $2"
+      shift 2
+      ;;
     -swenc|--swenc)
       codec=h264
       shift