reduce ffmpeg memory footprint

Jenkinsfile

@@ -241,8 +241,7 @@ spec:
 						"MAVEN_OPTS=-Xmx2048m -XshowSettings:vm -Duser.home=/home/jenkins"]){
 						dir ('gemoc-studio/dev_support/tycho_full_compilation') {
 							sh 'printenv'         
-							sh "python3 ~/memory-monitor-per-process.py > build_product_process_mem.log &\
-								mvn -Dmaven.test.failure.ignore \"-Dstudio.variant=${studioVariant}\" -Dbranch.variant=${BRANCH_VARIANT} \
+							sh "mvn -Dmaven.test.failure.ignore \"-Dstudio.variant=${studioVariant}\" -Dbranch.variant=${BRANCH_VARIANT} \
 									-Djava.awt.headless=true \
 									--projects ../../gemoc_studio/releng/org.eclipse.gemoc.gemoc_studio.targetplatform,../../gemoc_studio/releng/org.eclipse.gemoc.gemoc_studio.updatesite\
 									clean install --errors --show-version --batch-mode "
@@ -280,13 +279,13 @@ spec:
 							/*
 							-crf : quality the lower the better
 							-r : frame per seconds
+							-preset ultrafast  : reduce memory footpring
 							*/   
-							sh "ffmpeg -f x11grab -video_size 1024x768 -i $DISPLAY -vcodec libx264 -tune stillimage -crf 23 -r 12 -pix_fmt yuv420p target/system_test.mp4 </tmp/stop-ffmpeg  >target/VideoCapture.log 2>>target/VideoCapture_err.log &"
+							sh "ffmpeg -f x11grab -video_size 1024x768 -i $DISPLAY -vcodec libx264 -tune stillimage -preset ultrafast -crf 23 -r 12 -pix_fmt yuv420p target/system_test.mp4 </tmp/stop-ffmpeg  >target/VideoCapture.log 2>>target/VideoCapture_err.log &"
 							// use linux timeout in order to continue the video capture
 							// capture the returnStatus in order to make sure to stop ffmepg even if an error occured
 							//def status = sh(returnStatus: true, script: "top -c -d 2 -w128 -b& \
-							def status = sh(returnStatus: true, script: "python3 ~/memory-monitor-per-process.py > test_process_mem.log &\
-							    timeout -s KILL 60m \
+							def status = sh(returnStatus: true, script: "timeout -s KILL 60m \
 								mvn -Dmaven.test.failure.ignore \"-Dstudio.variant=${studioVariant}\" -Dbranch.variant=${BRANCH_VARIANT} \
 									--projects ../../gemoc_studio/tests/org.eclipse.gemoc.studio.tests.system.lwb,../../gemoc_studio/tests/org.eclipse.gemoc.studio.tests.system.mwb,../../gemoc_studio/releng/org.eclipse.gemoc.gemoc_studio.targetplatform\
 									verify --errors --show-version --batch-mode ")