Update Frequently Asked Questions

tutorials/Frequently-Asked-Questions.md

@@ -40,6 +40,7 @@
 - [How secure are you?](#advanced-8)
 - [When do public IPs get exposed?](#advanced-9)
 - [What port Jami uses?](#advanced-10)
+- [How can I configure the codecs even more?](#advanced-11)
 
 This page aims to gather as many resources as possible (technical or not) and
 condense them to create concise documentation. Then, this can then be
@@ -372,4 +373,40 @@ If you run your own proxy or nameserver:
 
 If you run your own TURN server:
 
-+ TURN/STUN: TCP+UDP 3478, 5349
++ TURN/STUN: TCP+UDP 3478, 5349
+
+
+### <a name="advanced-11">How can I configure the codecs even more?</a>
+
+Codecs can be configured via a file. In the configurations files, you can create a file called `encoder.json` like this:
+
+```
+{
+    "libx264": {
+        "profile": 100,
+        "level": 42,
+        "crf": 20,
+        "preset": "ultrafast"
+    },
+    "h264_vaapi": {
+        "low_power": 1
+    },
+    "libopus": {
+        "application": "voip"
+    }
+}
+```
+
+or:
+
+```
+{
+    "libopus": {
+        "bit_rate": 128000
+    }
+}
+```
+
+This file is located in the same directory of `dring.yml` (https://git.jami.net/savoirfairelinux/ring-project/wikis/technical/Ring-configuration-path)
+
+The best way to check which options are supported is through the command "ffmpeg -h encoder=\[encoder_name\]" where encoder_name can be whichever of libx264, libvpx, mpeg4, h263, libopus, libspeex, g722, pcm_alaw, pcm_mulaw (FFmpeg names for all of Jami's supported encoders).