Updated FFmpeg recording and live streaming (markdown)

FFmpeg-recording-and-live-streaming.md

@@ -40,3 +40,24 @@ The recognized config options are:
 
     video_{option} = <value> # Sets generic video option {option} to <value>. This is codec specific. Mostly useful for libx264.
     audio_{option} = <value> # Sets generic audio option {option} to <value>. This is codec specific.
+
+## Live streaming
+
+RetroArch can live stream to RTMP services like [twitch](http://www.twitch.tv/).
+To live stream there. Create a config that is tailored for twitch. Example:
+
+    vcodec = libx264
+    acodec = libmp3lame
+    pix_fmt = yuv420p
+    scale_factor = 2
+    threads = 3
+    video_crf = 25
+    video_preset = superfast
+    video_tune = animation
+    audio_global_quality = 75
+    sample_rate = 44100
+    format = flv
+
+Now you can stream to twitch with a command like:
+
+    retroarch --record rtmp://live.twitch.tv/app/$YOUR_TWITCH_ID --recordconfig twitch.cfg