@echo off
TITLE Status

echo [ Multi-Cam Recording started. ]
echo:

:: Generate timestamp and file names.
set DATE_STRING=%DATE:~6,4%%DATE:~3,2%%DATE:~0,2%
set TIME_STRING=%TIME:~0,2%%TIME:~3,2%
set TIMESTAMP=%DATE_STRING%_%TIME_STRING%

set CAMERA_1_FILENAME="E:\\camera_1_"%TIMESTAMP%
set CAMERA_2_FILENAME="E:\\camera_2_"%TIMESTAMP%
set CAMERA_3_FILENAME="E:\\camera_3_"%TIMESTAMP%

:: Start recording cameras and outputting over NDI.
start "FFMPEG: Camera 1" /min "C:\Program Files (x86)\FFmpegGUI\ffmpeg64.exe" -ss 1 -f decklink -i "DeckLink Duo (1)@6" -f matroska -c:v h264_nvenc -b:v 30M -preset:v default -g 30 -pix_fmt yuvj420p -c:a aac -b:a 128k -y %CAMERA_1_FILENAME%.mkv -f libndi_newtek -y Camera_1
echo   Writing Camera 1 to "E:\\camera_1_%TIMESTAMP%.mkv"
start "FFMPEG: Camera 2" /min "C:\Program Files (x86)\FFmpegGUI\ffmpeg64.exe" -ss 1 -f decklink -i "DeckLink Duo (2)@6" -f matroska -c:v h264_nvenc -b:v 30M -preset:v default -g 30 -pix_fmt yuvj420p -c:a aac -b:a 128k  -y %CAMERA_2_FILENAME%.mkv -f libndi_newtek -y Camera_2
echo   Writing Camera 2 to "E:\\camera_2_%TIMESTAMP%.mkv"
start "FFMPEG: Camera 3" /min "C:\Program Files (x86)\FFmpegGUI\ffmpeg64.exe" -ss 1 -f decklink -i "DeckLink Duo (3)@6" -f matroska -c:v libx264 -b:v 30M -preset:v veryfast -g 30 -pix_fmt yuvj420p -c:a aac -b:a 128k -y %CAMERA_3_FILENAME%.mkv -f libndi_newtek -y Camera_3
echo   Writing Camera 3 to "E:\\camera_3_%TIMESTAMP%.mkv"
echo:

:: Wait for key press to stop recording.
choice /M "Press X to stop recording..." /N /C X
taskkill /fi "windowtitle eq FFMPEG: Camera 1"
taskkill /fi "windowtitle eq FFMPEG: Camera 2"
taskkill /fi "windowtitle eq FFMPEG: Camera 3"
echo:

choice /M "Remux Recordings" /C YN
IF ERRORLEVEL 1 (
    echo   Remuxing "E:\\camera_1_%TIMESTAMP%.mkv" to "E:\\camera_1_%TIMESTAMP%.mp4"
    start "REMUX: Camera 1" /min "C:\Program Files (x86)\FFmpegGUI\ffmpeg64.exe" -i %CAMERA_1_FILENAME%.mkv -c:a copy -c:v copy %CAMERA_1_FILENAME%.mp4
    echo   Remuxing "E:\\camera_2_%TIMESTAMP%.mkv" to "E:\\camera_1_%TIMESTAMP%.mp4"
    start "REMUX: Camera 1" /min "C:\Program Files (x86)\FFmpegGUI\ffmpeg64.exe" -i %CAMERA_2_FILENAME%.mkv -c:a copy -c:v copy %CAMERA_2_FILENAME%.mp4
    echo   Remuxing "E:\\camera_3_%TIMESTAMP%.mkv" to "E:\\camera_1_%TIMESTAMP%.mp4"
    start "REMUX: Camera 1" /min "C:\Program Files (x86)\FFmpegGUI\ffmpeg64.exe" -i %CAMERA_3_FILENAME%.mkv -c:a copy -c:v copy %CAMERA_3_FILENAME%.mp4
)
pause