#!/bin/bash


# GLOBAL VARIABLES
# GOP [frames] = seg_duration [s] * framerate [frames/s]
segDuration=1.0
framerate=30

gop=30
# gop=$(echo "$segDuration * $framerate" | bc) # floating point operation
# gop=${gop%.*}  # truncate decimal part
# echo -e "GOP: $gop \n seg_duration: $segDuration \n framerate: $framerate \n"

# Chunks
fragDuration=0.5
fragType='every_frame' # every_frame, duration, [none]
#CBR (Constant Bit Rate)
bitrate=3000K

# Encoder
cd ~/ffmpeg_sources/ffmpeg && \
./ffmpeg \
-v verbose \
-listen 1 \
-i 'rtmp://127.0.0.1:1935/stream/test' \
-flags +global_header \
-r $framerate \
\
-filter_complex "settb=AVTB,setpts='trunc(PTS/1K)*1K+st(1,trunc(RTCTIME/1K))-1K*trunc(ld(1)/1K)',\
drawbox=x=0:y=0:width=400:height=100:[email protected]:t=fill,\
drawtext=text='%{localtime\:%M}\:%{localtime\:%S}.%{eif\:1M*t-1K*trunc(t*1K)\:d\:3}':x=15:y=20:\
fontfile=/usr/share/fonts/truetype/freefont/FreeSans.ttf:fontsize=80:fontcolor=white,\
split=1[s0]" \
\
-pix_fmt yuv420p \
-c:v libx264 \
\
-b:v:0 $bitrate -minrate:v:0 $bitrate -maxrate:v:0 $bitrate -bufsize:v:0 $bitrate \
\
-g:v $gop -keyint_min:v $gop -sc_threshold:v 0 \
\
-color_primaries bt709 -color_trc bt709 -colorspace bt709 \
\
-c:a aac -ar 48000 -b:a 96k \
\
-map [s0] \
-map 0:a:0 \
\
-preset ultrafast \
-tune zerolatency \
\
-use_template 1 \
-use_timeline 0 \
-streaming 1 \
-frag_type $fragType \
-flags +global_header \
-ldash 1 \
-remove_at_exit 1 \
-utc_timing_url 'https://time.akamai.com?iso&ms' \
-format_options 'movflags=cmaf' \
-write_prft 1 \
-target_latency '3.0' \
-seg_duration $segDuration \
-frag_duration $fragDuration \
-adaptation_sets "id=0,streams=v id=1,streams=a" \
-init_seg_name init-L\$RepresentationID\$.mp4 \
-media_seg_name frag-N\$Number\$-L\$RepresentationID\$.mp4 \
-method PUT \
-f dash \
"http://127.0.0.1:80/upload/live.mpd"