diff --git a/bin/ffx.py b/bin/ffx.py
index 0bc86ca..8c81b70 100755
--- a/bin/ffx.py
+++ b/bin/ffx.py
@@ -153,11 +153,15 @@ def getUnmuxSequence(trackDescriptor: TrackDescriptor, sourcePath, targetPrefix,
 @click.option('-l', '--label', type=str, default='', help='Label to be used as filename prefix')
 @click.option("-o", "--output-directory", type=str, default='')
 @click.option("-s", "--subtitles-only", is_flag=True, default=False)
+@click.option('--nice', type=int, default=99, help='Niceness of started processes')
+@click.option('--cpu', type=int, default=0, help='Limit CPU for started processes to percent')
 def unmux(ctx,
             paths,
             label,
             output_directory,
-            subtitles_only):
+            subtitles_only,
+            nice,
+            cpu):
 
     existingSourcePaths = [p for p in paths if os.path.isfile(p)]
     ctx.obj['logger'].debug(f"\nUnmuxing {len(existingSourcePaths)} files")
@@ -195,7 +199,7 @@ def unmux(ctx,
                     if unmuxSequence:
                         if not ctx.obj['dry_run']:
                             ctx.obj['logger'].debug(f"Executing unmuxing sequence: {' '.join(unmuxSequence)}")
-                            out, err, rc = executeProcess(unmuxSequence)
+                            out, err, rc = executeProcess(unmuxSequence, niceness=nice, cpu_percent=cpu)
                             if rc:
                                 ctx.obj['logger'].error(f"Unmuxing of stream {trackDescriptor.getIndex()} failed with error ({rc}) {err}")        
                     else:
@@ -314,6 +318,9 @@ def checkUniqueDispositions(context, mediaDescriptor: MediaDescriptor):
 @click.option("--no-signature", is_flag=True, default=False)
 @click.option("--keep-mkvmerge-metadata", is_flag=True, default=False)
 
+@click.option('--nice', type=int, default=99, help='Niceness of started processes')
+@click.option('--cpu', type=int, default=0, help='Limit CPU for started processes to percent')
+
 def convert(ctx,
             paths,
             label,
@@ -360,7 +367,10 @@ def convert(ctx,
             dont_pass_dispositions,
             no_prompt,
             no_signature,
-            keep_mkvmerge_metadata):
+            keep_mkvmerge_metadata,
+            
+            nice,
+            cpu):
     """Batch conversion of audiovideo files in format suitable for web playback, e.g. jellyfin
 
     Files found under PATHS will be converted according to parameters.
@@ -387,6 +397,12 @@ def convert(ctx,
     context['no_signature'] = no_signature
     context['keep_mkvmerge_metadata'] = keep_mkvmerge_metadata
 
+
+    context['resource_limits'] = {}
+    context['resource_limits']['niceness'] = nice
+    context['resource_limits']['cpu_percent'] = cpu
+
+
     context['denoiser'] = NlmeansController(parameters = denoise,
                                             strength = denoise_strength,
                                             patchSize = denoise_patch_size,
diff --git a/bin/ffx/ffx_controller.py b/bin/ffx/ffx_controller.py
index fed41e0..f1e28ba 100644
--- a/bin/ffx/ffx_controller.py
+++ b/bin/ffx/ffx_controller.py
@@ -43,6 +43,10 @@ class FfxController():
 
         self.__configurationData = self.__context['config'].getData()
 
+        # Convenience
+        self.__niceness = self.__context['resource_limits']['niceness'] if 'resource_limits' in self.__context.keys() and 'niceness' in self.__context['resource_limits'].keys() else 99
+        self.__cpuPercent = self.__context['resource_limits']['cpu_percent'] if 'resource_limits' in self.__context.keys() and 'cpu_percent' in self.__context['resource_limits'].keys() else 0
+
         self.__logger = context['logger']
 
 
@@ -268,7 +272,7 @@ class FfxController():
             self.__logger.debug(f"FfxController.runJob() commandSequence:{' '.join(commandSequence)}")
 
             if not self.__context['dry_run']:
-                executeProcess(commandSequence)
+                executeProcess(commandSequence, niceness=self.__niceness, cpu_percent=self.__cpuPercent)
 
 
         if videoEncoder == VideoEncoder.VP9:
@@ -296,7 +300,7 @@ class FfxController():
                 os.remove(FfxController.TEMP_FILE_NAME)
 
             if not self.__context['dry_run']:
-                executeProcess(commandSequence1)
+                executeProcess(commandSequence1, niceness=self.__niceness, cpu_percent=self.__cpuPercent)
 
             commandSequence2 = (commandTokens
                                 + self.__targetMediaDescriptor.getImportFileTokens()
@@ -318,7 +322,7 @@ class FfxController():
             self.__logger.debug(f"FfxController.runJob() commandSequence2:{' '.join(commandSequence2)}")
 
             if not self.__context['dry_run']:            
-                out, err, rc = executeProcess(commandSequence2)
+                out, err, rc = executeProcess(commandSequence2, niceness=self.__niceness, cpu_percent=self.__cpuPercent)
                 if rc:
                     raise click.ClickException(f"Command resulted in error: rc={rc} error={err}")
 
@@ -345,4 +349,4 @@ class FfxController():
                             str(length),
                             path]
 
-        out, err, rc = executeProcess(commandTokens)
+        out, err, rc = executeProcess(commandTokens, niceness=self.__niceness, cpu_percent=self.__cpuPercent)
diff --git a/bin/ffx/process.py b/bin/ffx/process.py
index 23e7802..805c4b1 100644
--- a/bin/ffx/process.py
+++ b/bin/ffx/process.py
@@ -1,9 +1,29 @@
-import subprocess
+import subprocess, click
 from typing import List
 
-def executeProcess(commandSequence: List[str], directory: str = None):
-    # process = subprocess.Popen([t.encode('utf-8') for t in commandSequence], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
-    process = subprocess.Popen(commandSequence, stdout=subprocess.PIPE, stderr=subprocess.PIPE, encoding='utf-8', cwd = directory)
+def executeProcess(commandSequence: List[str], directory: str = None, niceness: int = 99, cpu_percent: int = 0):
+    """
+    niceness -20 bis +19
+    cpu_percent: 1 bis 99
+    """
+
+    nice = int(niceness)
+    cpu = int(cpu_percent)
+
+    click.echo(f"nice {nice} cpu {cpu}")
+
+    niceSequence = []
+
+    if nice >= -20 and nice <= 19:
+        niceSequence += ['nice', '-n', str(nice)]
+    if cpu >= 1 and cpu <= 99:
+        niceSequence += ['cpulimit', '-l', str(cpu), '--']
+
+    niceCommand = niceSequence + commandSequence
+
+    click.echo(f"executeProcess(): {' '.join(niceCommand)}")
+
+    process = subprocess.Popen(niceCommand, stdout=subprocess.PIPE, stderr=subprocess.PIPE, encoding='utf-8', cwd = directory)
     output, error = process.communicate()
-    # return output.decode('utf-8'), error.decode('utf-8'), process.returncode
+    
     return output, error, process.returncode
diff --git a/bin/ffx/test/scenario.py b/bin/ffx/test/scenario.py
index 70f67ff..965e463 100644
--- a/bin/ffx/test/scenario.py
+++ b/bin/ffx/test/scenario.py
@@ -103,6 +103,10 @@ class Scenario():
         self._testDbFilePath = os.path.join(self._testDirectory, 'test.db')
         self.createEmptyTestDatabase()
 
+        # Convenience
+        self._niceness = self._context['resource_limits']['niceness'] if 'resource_limits' in self._context.keys() and 'niceness' in self._context['resource_limits'].keys() else 99
+        self._cpuPercent = self._context['resource_limits']['cpu_percent'] if 'resource_limits' in self._context.keys() and 'cpu_percent' in self._context['resource_limits'].keys() else 99
+
 
     def createEmptyTestDatabase(self):
 
diff --git a/bin/ffx/test/scenario_1.py b/bin/ffx/test/scenario_1.py
index 2aa0c1b..9778715 100644
--- a/bin/ffx/test/scenario_1.py
+++ b/bin/ffx/test/scenario_1.py
@@ -118,7 +118,7 @@ class Scenario1(Scenario):
 
         self._logger.debug(f"{variantLabel}: Test sequence: {commandSequence}")
 
-        out, err, rc = executeProcess(commandSequence, directory = self._testDirectory)
+        out, err, rc = executeProcess(commandSequence, directory = self._testDirectory, niceness=self._niceness, cpu_percent=self._cpuPercent)
 
         if out and self._context['verbosity'] >= 9:
             self._logger.debug(f"{variantLabel}: Process output: {out}")
diff --git a/bin/ffx/test/scenario_2.py b/bin/ffx/test/scenario_2.py
index fd5964d..2045eb0 100644
--- a/bin/ffx/test/scenario_2.py
+++ b/bin/ffx/test/scenario_2.py
@@ -103,7 +103,7 @@ class Scenario2(Scenario):
 
         self._logger.debug(f"{variantLabel}: Test sequence: {commandSequence}")
 
-        out, err, rc = executeProcess(commandSequence, directory = self._testDirectory)
+        out, err, rc = executeProcess(commandSequence, directory = self._testDirectory, niceness=self._niceness, cpu_percent=self._cpuPercent)
 
         if out and self._context['verbosity'] >= 9:
             self._logger.debug(f"{variantLabel}: Process output: {out}")
diff --git a/bin/ffx/test/scenario_4.py b/bin/ffx/test/scenario_4.py
index 48dc7f1..e21a620 100644
--- a/bin/ffx/test/scenario_4.py
+++ b/bin/ffx/test/scenario_4.py
@@ -187,7 +187,7 @@ class Scenario4(Scenario):
 
         self._logger.debug(f"{variantLabel}: Test sequence: {commandSequence}")
 
-        out, err, rc = executeProcess(commandSequence, directory = self._testDirectory)
+        out, err, rc = executeProcess(commandSequence, directory = self._testDirectory, niceness=self._niceness, cpu_percent=self._cpuPercent)
 
         if out and self._context['verbosity'] >= 9:
             self._logger.debug(f"{variantLabel}: Process output: {out}")