FFMPEG single input file, crop to multiple streams, then overlay back into one output file?
Use

ffmpeg -ss %startTime% -t %duration% -i %input% -filter_complex "[0:v]split=2[c1][c2];[c1]crop=%size%:%position%[c1];[c2]crop=200:110:6558:106[c2];[c1][c2]overlay=%pixFrmLeft%:%pixFrmTop%" {your encoding options} %input%_Converted.mp4

Note that -framerate 8 is an input option for certain file formats. For an output at 8 fps, use -r 8.