HEVC Test Pattern to UDP Multicast

hevc-test-pattern.bat

@echo off

:: Set duration in seconds
set duration=10
:: Temporary loop TS file to create
set loopfile=loop.mkv
:: Target mpegts URL (ESCAPE &s with ^!!! and add double quotes)
:: see https://www.ffmpeg.org/ffmpeg-protocols.html#udp for full syntax
set "target=udp://239.0.0.1:1234?ttl=13^&pkt_size=1316"

echo %target%
::exit

:: Create the loop file
if not exist %loopfile% (
	ffmpeg.exe ^
		-f lavfi -i "smptehdbars=duration=%duration%:size=1280x720:rate=60000/1001" ^
		-f lavfi -i "sine=frequency=220:beep_factor=5:sample_rate=48000:duration=%duration%" ^
		-c:v libx265 -x265-params bframes=0 -b:v 100k -preset slow ^
		-force_key_frames "expr:gte(t,n_forced*3)" ^
		-c:a aac -b:a 16k ^
		-y ^
		%loopfile%
)

:: Play it
ffmpeg.exe ^
	-threads 2 ^
	-re -fflags +genpts -stream_loop -1 ^
	-i %loopfile% -vcodec copy -acodec copy ^
	-f mpegts %target%



:: Various options for encoding I tried
::		-c:v libx265 -b:v 50k -x265-params keyint=100:no-open-gop -preset slow ^
:: 		-c:v libx265 -x265-params bframes=0 -b:v 100k -preset slow ^

::		-f lavfi -i "sine=frequency=1000:sample_rate=48000:duration=%duration%" ^
::		-c:v libx265 -x265-params bframes=0 -b:v 100k -preset slow ^