[QGIS-it-user] input problem with pyqgis gdal:merge

[Giacomo Fontanelli]

Dear forum

I need yo stack some rasters using pyqgis

This is the code I wrote

import processing
from processing.core.Processing import Processing
from qgis.core import *

parameters = {'INPUT':
'/home/file1.tif;/home/file2.tif;/home/file3.tif;/home/file4.tif', \
                        'PCT': False, \
                        'SEPARATE': False, \
                        'NODATA_INPUT': 0, \
                        'NODATA_OUTPUT': 0, \
                        'OPTIONS': "", \
                        'DATA_TYPE': 5, \
                        'OUTPUT': '/home/stack.tif'}
processing.run ('gdal:merge', parameters)

but I get this error

Traceback (most recent call last):
  File "/usr/lib/python3.7/code.py", line 90, in runcode
    exec(code, self.locals)
  File "<input>", line 1, in <module>
  File "<string>", line 76, in <module>
  File "/usr/share/qgis/python/plugins/processing/tools/general.py", line
106, in run
    return Processing.runAlgorithm(algOrName, parameters, onFinish,
feedback, context)
  File "/usr/share/qgis/python/plugins/processing/core/Processing.py", line
137, in runAlgorithm
    raise QgsProcessingException(msg)
_core.QgsProcessingException: Unable to execute algorithm
Incorrect parameter value for INPUT


I use

QGIS version

3.8.0-Zanzibar

QGIS code revision

11aff65 <https://github.com/qgis/QGIS/commit/11aff65>

Compiled against Qt

5.12.2

Running against Qt

5.12.2

Compiled against GDAL/OGR

2.4.0

Running against GDAL/OGR

2.4.0

Compiled against GEOS

3.7.1-CAPI-1.11.1

Running against GEOS

3.7.1-CAPI-1.11.1 27a5e771

Thank you very much

Grazie
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