mpegize: remove processed raw files

raw files are save in tmpfs and consume RAM, to avoid extra
RAM-pressure remove these files after they are processed and not
needed anymore.

mpegize.py

@@ -524,6 +524,7 @@ class Mpegize:
                             '-T', n])  # -T Output TIFF
             subprocess.run(['convert', base+'.tiff', base+'.jpeg'])
             os.unlink(base+'.tiff')
+            os.unlink(n)
             os.rename(base+'.jpeg', m.source+"/"+base+'.jpeg.sv')
 
 m = Mpegize()