Uses https://ffmpeg.org/ to tag a video file as being SBS 3D. Just drag+drop the video file onto this batch file in same folder with ffmpeg.exe

3dify-REDHydrogenOneDownmix.bat

@ECHO OFF
cd %~dp0
ffmpeg.exe -i "%~1" -c:v copy -c:a aac -af "pan=stereo|FL=0.5*FC+0.707*FL+0.707*BL+0.5*LFE|FR=0.5*FC+0.707*FR+0.707*BR+0.5*LFE,volume=1.660156" -metadata:s:v:0 stereo_mode=1 "%~n1_half_2x1.mp4"
echo Output file is: "%~n1_half_2x1.mp4"
@PAUSE

3dify-REDHydrogenOneStereo.bat

@ECHO OFF
cd %~dp0
ffmpeg.exe -i "%~1" -c:v copy -c:a aac -metadata:s:v:0 stereo_mode=1 "%~n1_half_2x1.mp4"
echo Output file is: "%~n1_half_2x1.mp4"
@PAUSE

3dify-youtube.bat

@ECHO OFF
cd %~dp0
ffmpeg -i %1 -vcodec libx264 -x264opts frame-packing=3 "%~n13D%~x1"
echo Output file is: "%~n13D%~x1"
@PAUSE

3dify.bat

@ECHO OFF
cd %~dp0
ffmpeg -i %1 -c copy -metadata:s:v:0 stereo_mode=1 "%~n13D%~x1"
echo Output file is: "%~n13D%~x1"
@PAUSE