rec and send SRT by ffmpeg

rec_send_srt.sh

#!/bin/sh -xue

HOST_IP=xx.yy.zz.ww
PORT=7001
RECDIR=$PWD/rec
SEGMENT_TIME=3600
FIFO=$PWD/.fifo

rm -f $FIFO
mkfifo $FIFO

filename="$RECDIR/d%04d.m2ts"
index_wrap=10000
last_index=`ls -t $RECDIR/d[0-9]*.m2ts |head -1 |sed -n -e 's/\.m2ts$//' -e 's/[^0-9]//gp'`
if [ -z $last_index ] ; then
    mkdir -p $RECDIR
    next_index=0
else
    next_index=`echo "($last_index + 1) % $index_wrap" |bc`
fi
touch $RECDIR/start_${next_index}_$(date +%Y%m%d%H%M%S)

ffmpeg -loglevel repeat+level+error -probesize 32 -f hevc -r 30 -i $FIFO -c copy -f tee -map 0:v \
       "[f=segment:segment_time=$SEGMENT_TIME:segment_start_number=$next_index:segment_wrap=$index_wrap]$filename|\
       [f=mpegts]srt://$HOST_IP:$PORT" &

gst-launch-1.0 -eq v4l2src device="/dev/video0" ! \
    'image/jpeg, width=1280, height=720, framerate=30/1' ! \
    nvv4l2decoder mjpeg=1 ! 'video/x-raw(memory:NVMM)' ! \
    nvvidconv ! 'video/x-raw(memory:NVMM), format=(string)I420' ! \
    nvv4l2h265enc insert-sps-pps=1 iframeinterval=60 bitrate=1000000 ! \
    queue2 ! filesink location=$FIFO