diff --git a/bin/ffx.py b/bin/ffx.py
index 2f7bd90..265d612 100755
--- a/bin/ffx.py
+++ b/bin/ffx.py
@@ -17,6 +17,37 @@ def executeProcess(commandSequence):
     return output
 
 
+def generateAV1Tokens(q, p):
+
+    return ['-c:v:0',
+            'libsvtav1',
+            '-svtav1-params',
+            f"crf={q}:preset={p}:tune=0:enable-overlays=1:scd=1:scm=0",
+            '-pix_fmt', 'yuv420p10le']
+
+def generateVP9Pass1Tokens(q):
+
+    return ['-c:v:0', 'libvpx-vp9', '-row-mt', '1',
+                '-crf', str(q), '-pass', '1', '-speed', '4',
+                '-frame-parallel', '0', '-g', '9999', '-aq-mode', '0']
+
+def generateVP9Pass2Tokens(q):
+
+    return ['-c:v:0', 'libvpx-vp9', '-row-mt', '1',
+                '-crf', str(q), '-pass', '2',
+                '-frame-parallel', '0', '-g', '9999', '-aq-mode', '0',
+                '-auto-alt-ref', '1', '-lag-in-frames', '25']
+
+
+def generateOutputTokens(f):
+    return ['-f', 'webm', f]
+
+def generateTestOutputTokens(f, q):
+    fTokens = f.split('.')
+    return ['-f', 'webm', fTokens[:-1] + [f" q{q}"] + fTokens[-1]]
+
+
+
 inputFilename = sys.argv[1]
 outputFilename = sys.argv[2]
 
@@ -26,6 +57,14 @@ if 'av1' in sys.argv:
 if 'vp9' in sys.argv:
     targetFormat = 'vp9'
 
+
+testQualities = []
+testTokens = [q for q in sys.argv if q.startswith('test=')]
+if testTokens:
+  qualitiesString = testTokens[0].split('=')[1]
+  testQualities = qualitiesString.split(',')
+
+
 quality = DEFAULT_QUALITY
 qualityTokens = [q for q in sys.argv if q.startswith('q=')]
 if qualityTokens:
@@ -116,40 +155,60 @@ outputTokens = ['-f', 'webm', outputFilename]
 
 nullTokens = ['-f', 'null', '/dev/null']
 
-av1Tokens = ['-c:v:0',
-                'libsvtav1',
-                '-svtav1-params',
-                f"crf={quality}:preset={preset}:tune=0:enable-overlays=1:scd=1:scm=0",
-                '-pix_fmt', 'yuv420p10le']
 
-vp9Pass1Tokens = ['-c:v:0', 'libvpx-vp9', '-row-mt', '1',
-                    '-crf', str(quality), '-pass', '1', '-speed', '4',
-                    '-frame-parallel', '0', '-g', '9999', '-aq-mode', '0']
+testTokens = ['-ss', '60', '-t', '180']
 
-vp9Pass2Tokens = ['-c:v:0', 'libvpx-vp9', '-row-mt', '1',
-                    '-crf', str(quality), '-pass', '2',
-                    '-frame-parallel', '0', '-g', '9999', '-aq-mode', '0',
-                    '-auto-alt-ref', '1', '-lag-in-frames', '25']
 
 
-if targetFormat == 'av1':
 
-    commandSequence = commandTokens + mappingTokens + av1Tokens + audioTokens + outputTokens
+if testQualities:
 
-    print(f"Command Sequence: {commandSequence}")
+    for testQ in testQualities:
 
-    executeProcess(commandSequence)
+        if targetFormat == 'av1':
 
-if targetFormat == 'vp9':
+            commandSequence = commandTokens + mappingTokens + generateAV1Tokens(testQ, preset) + audioTokens + testTokens + generateTestOutputTokens(outputFilename, testQ)
+    
+            print(f"Command Sequence: {commandSequence}")
+    
+            executeProcess(commandSequence)
 
-    commandSequence1 = commandTokens + vp9Pass1Tokens + audioTokens + nullTokens
 
-    print(f"Command Sequence 1: {commandSequence1}")
+        if targetFormat == 'vp9':
 
-    executeProcess(commandSequence1)
+            commandSequence1 = commandTokens + generateVP9Pass1Tokens(testQ) + testTokens + nullTokens
+    
+            print(f"Command Sequence 1: {commandSequence1}")
+    
+            executeProcess(commandSequence1)
+    
+            commandSequence2 = commandTokens + mappingTokens + generateVP9Pass2Tokens(testQ) + audioTokens + testTokens + generateTestOutputTokens(outputFilename, testQ)
+    
+            print(f"Command Sequence 2: {commandSequence2}")
+    
+            executeProcess(commandSequence2)
 
-    commandSequence2 = commandTokens + mappingTokens + vp9Pass2Tokens + audioTokens + outputTokens
 
-    print(f"Command Sequence 2: {commandSequence2}")
+else:
 
-    executeProcess(commandSequence2)
+    if targetFormat == 'av1':
+    
+        commandSequence = commandTokens + mappingTokens + generateAV1Tokens(quality, preset) + audioTokens + generateOutputTokens(outputFilename)
+    
+        print(f"Command Sequence: {commandSequence}")
+    
+        executeProcess(commandSequence)
+    
+    if targetFormat == 'vp9':
+    
+        commandSequence1 = commandTokens + generateVP9Pass1Tokens(quality) + audioTokens + nullTokens
+    
+        print(f"Command Sequence 1: {commandSequence1}")
+    
+        executeProcess(commandSequence1)
+    
+        commandSequence2 = commandTokens + mappingTokens + generateVP9Pass2Tokens(quality) + audioTokens + generateOutputTokens(outputFilename)
+    
+        print(f"Command Sequence 2: {commandSequence2}")
+    
+        executeProcess(commandSequence2)