Hi @nicholas, a possible way is:

1. Create a workspace that converts a single GeoTIFF to an ECW.
2. Create another workspace: read GeoTIFF file paths in a specified folder with a PATH reader, call the first workspace with a WorkspaceRunner (Wait for Job to Complete: Yes) to convert GeoTIFF to ECW, and remove the source GeoTIFF file whenever a translation completed.

The second workspace looks like this.

# PythonCaller Script Example: Remove a file.
import os
def processFeature(feature):
    os.remove(feature.getAttribute('path_unix'))

I have it almost, but not quite, working

There is an error with the PythonCaller

WorkspaceRunner: Successfully ran workspace `D:/2019/07/tif2ecw/geotiff2ecw.fmw'

PythonFactory failed to load python symbol `FeatureProcessor'

Factory proxy not initialized

PythonCaller(PythonFactory): PythonFactory failed to process feature

Path Reader: Closing the PATH Reader

A fatal error has occurred. Check the logfile above for details

Translation FAILED with 4 error(s) and 1 warning(s) (0 feature(s) output)

Class or Function to Process Features: FeatureProcessor

# PythonCaller Script Example: Remove a file.

import os

def processFeature(feature):

os.remove(feature.getAttribute('path_windows'))

You have to set the name of function or class which you intend to execute - "processFeature" in my example - to the Class or Function to Process Features parameter in the PythonCaller.

See also the help on the transformer: PythonCaller

I have found a solution, which is to replace the PythonCaller with a SystemCaller.

This works for me, because the dos command is quite simple

del @Value(path_windows)

I realise that PythonCaller is more flexible, but I don't know Python well enough to make it work