Trying to convert frames to a video using ffmpeg in a batch script

I'm doing a script to convert frames into a video.

@echo off
set /p ftv="Want to covert the frames to video (yes or no): "
if %ftv%==yes (echo Ok, initializing frame convertion... & timeout 1 >nul & set /p framerate="Please specify the framerate: " & set /p crf="Please specify a CRF value: " & timeout 1 >nul & ffmpeg -framerate %framerate% -i "%cd%\Interpolated_frames\%%6d.png" -c:v libx264 -preset veryslow -crf %crf% "%cd%\FinalVideo.mp4" & echo Video ready, check the folder for the final video & timeout 1 >nul)

It is suppposed to let you choose the framerate and the crf value, but when running it, ffmpeg gives me Output file #0 does not contain any stream

Dividing it into singular parts like this make it work, but I need to use it with the if

@echo off    
echo Ok, initializing frame convertion...
timeout 1 >nul
set /p framerate="Please specify the framerate: "
set /p crf="Please specify a CRF value: "
timeout 1 >nul & ffmpeg -framerate %framerate% -i "%cd%\Interpolated_frames\%%6d.png" -c:v libx264 -preset veryslow -crf %crf% "%cd%\FinalVideo.mp4"
echo Video ready, check the folder for the final video
timeout 1 >nul