Find Position in a Film/Video by a Frame Is there an application or online service that is able to find a position (either as a frame number or time from film beginning) in a film by a frame from that film, represented as standalone picture (even if that picture was converted, resized, cropped, etc.)?
Try the command:

ffmpeg -i in.mp4 -loop 1 -i croppedframe.jpg -an -filter_complex "[0]crop=w:h:x:y[a];[1][a]blend=difference,blackframe=90:32" -f null - 


This will match a movie frame if at least 90% of the pixels have a difference in value of less than 32 with the image. Any such matching frames will have their timestamps shown