documentation: update readme

README

@@ -32,6 +32,11 @@ will not build.
 
 -f output file name, any libavformat compatible url is supported.
 
+-m specific modeline, resolution+framerate
+
+NOTE: make sure you are processing frames capture in real time or be
+prepared to end up using all your memory quite quickly, HD raw data
+fills up memory quickly.
 
 avconv -vsync 1 -i <source> -c:v rawvideo -pix_fmt uyvy422 -c:a pcm_s16le -ar 48000 -f nut - | ./bmdplay -f pipe:0
 
@@ -43,4 +48,4 @@ avconv -vsync 1 -i <source> -c:v rawvideo -pix_fmt uyvy422 -c:a pcm_s16le -ar 48
 
   -- Contact
 
-You can contact me either at lu_zero@gentoo.org or luca.barbato@axant.it
+You can contact me either at lu_zero@gentoo.org or luca.barbato@gmail.com