From 9b35745c4b14079bd32c3304eb7888350da92e69 Mon Sep 17 00:00:00 2001
From: Signor Pellegrino <68112357+FlyRouter@users.noreply.github.com>
Date: Sun, 21 Apr 2024 00:05:25 +0300
Subject: [PATCH] Update fpv-audio.md

---
 en/fpv-audio.md | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/en/fpv-audio.md b/en/fpv-audio.md
index 50f4919..4ebe247 100644
--- a/en/fpv-audio.md
+++ b/en/fpv-audio.md
@@ -1,12 +1,12 @@
-# Audio on FPV (Experimental)
+## Audio on FPV (Experimental)
 
-## Overview
+### Overview
 Everything has been tested using steamdeck (PC x86) and ssc338q-imx415 Anjoy board and choice of decoders and similar may reflect this.
 Cúrrently there is ~200msec delay on audio stream, encoding settings may improve this (smaller packets, opus supports 20msec intervals), changing OS settings, changing to PCM/PCMA/PCMU.
 Most interesting observation is that the audio/video is perfectly synced in recorded TS file. It indicates delay comes from the decoder chain in GSTreamer. 
 If using mpegtsmux like I did, there is no need for decoding and parsing when using OPUS.
 
-## Majestic and general settings
+### Majestic and general settings
 Audio settings (majestic.yaml):
 ```
 cli -s .audio.enabled true
@@ -15,7 +15,7 @@ cli -s .audio.srate 8000 (goes up to 48000 but consumes more bandwidth)
 Port can be set (default 5700) with:
 `cli -s .outgoing.audioPort 6200` (does it really work?)
 
-## Quick wfb_ng setup
+### Quick wfb_ng setup
 Example wfb_ng setup:
 Drone:
 ```
@@ -26,28 +26,28 @@ GS:
 wfb_rx -p 0 -c 127.0.0.1 -u 5700 -K /etc/gs.key -i 7669207 wlan1
 ```
 
-## Client side audio & video commands
+### Client side audio & video commands
 GST command for opus 8000hz (sound only):
 ```
 gst-launch-1.0 udpsrc port=5700 ! application/x-rtp, payload=98, encoding-name=OPUS ! rtpopusdepay ! opusdec ! audioconvert ! autoaudiosink sync=false
 ```
 
-# Working sound, video & save!!!!
+### Working sound, video & save!!!!
 ```
 gst-launch-1.0 udpsrc port=5600 caps='application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H265' ! rtpjitterbuffer ! rtph265depay ! tee name=videoTee ! queue ! ts. udpsrc port=5700 ! application/x-rtp, payload=98, encoding-name=OPUS ! rtpjitterbuffer ! rtpopusdepay ! tee name=audioTee ! queue ! ts. mpegtsmux name=ts ! filesink location=/run/media/deck/170a3e7f-325f-4567-8580-0e01dda76973/video/record-$(date +%y%m%d_%H%M%S).tsn sync=true -e videoTee. ! vaapih265dec ! fpsdisplaysink fps-update-interval=250 video-sink=autovideosink text-overlay=true sync=false audioTee. ! opusdec ! audioconvert ! pulsesink sync=false
 ```
 
-## Video & sound play
+### Video & sound play
 ```
 gst-launch-1.0 udpsrc port=5600 caps='application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H265' ! rtph265depay ! vaapih265dec ! autovideosink sync=false udpsrc port=5700 ! application/x-rtp, payload=98, encoding-name=OPUS ! rtpopusdepay ! opusdec ! audioconvert ! autoaudiosink sync=false
 ```
 
-## Video & sound record
+### Video & sound record
 ```
 gst-launch-1.0 udpsrc port=5600 caps='application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H265' ! rtpjitterbuffer ! rtph265depay ! queue ! ts. udpsrc port=5700 ! application/x-rtp, payload=98, encoding-name=OPUS ! rtpjitterbuffer ! rtpopusdepay ! queue ! ts. mpegtsmux name=ts ! filesink location=/run/media/deck/170a3e7f-325f-4567-8580-0e01dda76973/video/record-$(date +%y%m%d_%H%M%S).tsn sync=true -e
 ```
 
-FFPLAY command for opusn 8000hz (sound only):
+### FFPLAY command for opusn 8000hz (sound only):
 ```
 ffplay.exe -fflags nobuffer -vn -flags low_delay -strict experimental -deadline realtime -framedrop -protocol_whitelist file,crypto,rtp,tcp,udp opus_audio.txt
 opus_audio.txt (sdp)
@@ -67,7 +67,7 @@ a=control:audio
 a=rtpmap:98 opus/8000/1
 ```
 
-# TODO & suggestions:
+### TODO & suggestions:
 Optimize and adapt GST commands to different gs platforms.
 
 ### /etc/wfb.conf