################################ # YomGuy's Linux Ultra Fast Tips ################################ ====================================== YomGuy's Linux Ultra Fast Tips (1/1) ====================================== ♫♪♫♪ ╔╦╦╦═╦╗╔═╦═╦══╦═╗ ♫♪♫♪♫♪ ♫♪♫♪ ║║║║╩╣╚╣═╣║║║║║╩╣ ♫♪♫♪♫♪ ♫♪♫♪ ╚══╩═╩═╩═╩═╩╩╩╩═╝ ♫♪♫♪♫♪ This is a list of my short command line tips to get some various, sometimes advanced, functions on GNU/Linux systems, especially on Debian. RENAME ====== rename more than 1 file :: rename 's/\_wav_/\_/g' *.pdf rename 's/\./\_/g' *.pdf; rename 's/\_pdf/\.pdf/' * REPLACE ======= replace a string in a file:: sed -ie 's/old/new/' *.txt sed -i -e 's/cellar/deefuzz/g' deefuzz_cellar_mp3_234.xml FIND & RM ========= find and remove:: find ./ -iname "*.pyc" -exec rm {} \; find . -name ".svn" -type d -exec rm -rf {} \; find . -name 'test*' -mtime +30 -type f -print0 |xargs -0 rm -f sudo find . -mtime +480 -exec rm {} \; FIND & CP ========= find and copy some files:: find -iname *.pdf -exec cp \{\} /data/pellerin/castem/pdf/ \; FIND & LN ========= find and link some files:: find /data/these/simuls/ -iname *.pdf > pdf.log -exec ln -s {} \; find /home/momo/data/these/simuls/castax_isov_pdf/t02/* -iname *.pdf -exec ln -s {} \; FIND & RENAME ============== _:: for i in ./*; do cd $i; rename 's/\./\_/g' *; cd ..; done for i in ./*; do cd $i; rename 's/\_pdf/\.pdf/' *; cd ..; done FIND & MV ========= _:: #isof=( 46_1 25_1 ) #isof=( 35 55 107 191 ) isof=( p_ c_ r_ vy_ vx_ tr_ hv_ hx_ hy_ ) #isof=( paxe vaxe iaxe v_sor p_sor p_ent v_ent t_par pp00 pp05 pp10 pp12 vp00 vp10 residus v_col p_col tpar ppar q- ) nf=${#isof[*]} for (( j = 0; j <= ($nf - 1); j++ )); do if [ ! -d ${isof[$j]} ]; then mkdir ${isof[$j]} fi mv *${isof[$j]}* ${isof[$j]} done SIX CHs: ======== _:: sudo chmod -R 664 *; sudo chmod -R +rX * LGRIND ====== _:: lgrind -i -lmatlab ttt.m > ttt.tex lgrind -i -lf ttt.dgibi > ttt.tex ICONV ===== _:: convmv -r --notest -f iso-8859-1 -t UTF-8 * EXPAND ======= _:: expand -t4 acpi.py > acpi2.py OCR ==== _:: mogrify -format pbm *.png for i in *.pbm; do ocrad --charset=iso-8859-15 -o $i.txt $i; done SOX ===== _:: for i in *.wav; do sox $i -s -w $i.wav; mv $i.wav converted/$i; done sox Jano_B-Homosapiens.mp3 -r 44100 -b 16 -s -t wav - | flac - -o Jano_B-Homosapiens.flac CONVERT ======= _:: convert -density 150x150 telecaster_video01.eps telecaster_video01.png for i in `ls *.eps`; do convert -density 200x200 $i $i.png; done crop:: convert waveform_homosapiens.png -crop 100x50% waveform_homosapiens2.png http://www.imagemagick.org/Usage/crop/#crop_percent GCC === _:: gcc -Wall -o random rand2.c gcc -Wall recapture.c -o recapture -ljack -lpthread -lrt -lsndfile HDPARM ======= _:: sudo hdparm -c1 -d1 -a256 -u1 /dev/hdc DVDBACKUP: =========== _:: dvdbackup -F -n DVD_TITLE -i/dev/dvd -o/home/karine/video/dvd/ BEAGLE: ======= _:: sudo apt-get install beagle; beagled --fg --debug best UMOUNT (FORCE) ============== _:: umount -l /dev/cdrom RAR === _:: rar a -m0 -v100000 CellarMixLive_050615_mp3.rar CellarMixLive_050615_mp3.wav rar a -m3 -v15000 Ce llarMixLive_050615_mp3.rar CellarMixLive_050615_mp3.wav SSH === _:: ssh-keygen -t rsa -b 4096 -f ~/.ssh/id_rsa Remote:: ssh -R 2222:localhost:22 parisson.com ECASOUND ======== ecasound -a:1 -i foo1.wav -a:2 -i foo2.wav -o jack_alsa cat f*.wav | ecasound -i stdin -o concat.wav APT === Le dï¿œpï¿œt maï¿œtre de chez debian wget http://ftp-master.debian.org/ziyi_key_2006.asc -O - | sudo apt-key add - - Le dï¿œpï¿œt debian-marillat gpg --keyserver hkp://wwwkeys.eu.pgp.net --recv-keys 1F41B907 gpg --armor --export 1F41B907 | sudo apt-key add - - Le dï¿œpï¿œt volatile wget http://volatile.debian.net/ziyi-2005.asc -O - | sudo apt-key add - echo "deb http://debian.parisson.org binary/" | sudo tee -a /etc/apt/sources.list WAITING FOR PROCESS: ====================== _:: dt=10 prog1="psextract.sh" prog2="/home/pellerin/castax/bin/psextract.sh /data/pellerin/castem/t02 8 /home/pellerin/castax_res/castax_isov_pdf/t02" while [ ! -z `pgrep $prog1` ]; do sleep $dt date echo "waiting for $prog1 to finish..." done && echo "$prog1 finished, launching $prog2" $prog2 MYSQL: ======= root pass: sudo /usr/bin/mysqladmin -u root password 'washnc.....' mysql> create database forum; mysql> GRANT ALL PRIVILEGES ON forum.* TO 'moderateur'@localhost mysql> identified by 'mot_de_passe_du_moderateur'; The following will create a database named "intranet". mysqladmin -p create intranet Next, create the database user account that will be used to access the database. mysql -p --user=root intranet mysql> GRANT ALL PRIVILEGES ON *.* TO intranet@localhost IDENTIFIED BY 'webcal01' WITH GRANT OPTION; mysql> FLUSH PRIVILEGES; mysql> QUIT If you will be accessing MySQL from a different machine than the one running the web server, repeat the command above and replace 'localhost' with the hostname of the other machine. Create the calendar tables using the supplied tables-mysql.sql file: mysql -p intranet < tables-mysql.sql In the above example, "intranet" is the name of your database. CHANGE ROOT PASS Alternativement, sur toutes les plate-formes, vous pouvez aussi choisir le nouveau mot de passe en utilisant le client mysql : 1. Stoppez et redï¿œmarrez mysqld avec l'option --skip-grant-tables comme dï¿œcrit plus haut. 2. Connectez vous au serveur mysqld avec : shell> mysql -u root mysql 3. Exï¿œcutez la commande suivante dans le client mysql : mysql> UPDATE user SET Password=PASSWORD('nouveaumotdepasse') -> WHERE User='root'; mysql> FLUSH PRIVILEGES; 4. Aprï¿œs cela, vous devriez pouvoir vous connecter avec le nouveau mot de passe. backup: mysqldump -u username -p dbname table1 > dump.sql set value: use novatix000501; update div_royreport SET montant=0.0 ; TRANSCODE ========= _:: ls -1 | grep .png > image_list.txt transcode -i image_list.txt -x imlist,null -g 720x480 --use_rgb -z -y ffmpeg,null -F mpeg4 -o test1.avi -H 0 -f 29.97 transcode -z -M 2 -x v4l,v4l -i /dev/video0 --import_v4l 0,38 -p /dev/dsp -y xvid -o test.avi -w 1500 -e 32000 -E 44100 -b 96 -s 7 -c 0-250 -g 360x288 -j 0,4 ffmpeg -i video.mp4 -vn -acodec pcm_s16le -ar 44100 -ac 1 bleriot11.wav ffmpeg -ss 80 -t 10 -i test_xvid.avi -f flv -vcodec flv -vb 500k -ab 96k -ar 44100 -y test.flv KERNEL CUSTOM ============= apt-get install kernel-package libncurses5-dev fakeroot wget bzip2 patch:: diff -uprN linux-2.6.15 linux-2.6.15-rt1 > patch-2.6.15-rt1-1 patch -p0 linux-2.6.15 > patch-2.6.15-rt1-1 api linux-source-2.... cd /usr/src/linux/ ou: bzip2 -dc /usr/src/patch-2.6.31.4-rt14.bz2 | patch -p1 --dry-run If you didn’t get any errors (which you shouldn’t) then do: bzip2 -dc /usr/src/patch-2.6.31.4-rt14.bz2 | patch -p1 Now the kernel source is patched with the real time preemption code by Ingo Molnar. Next is the M-Audio USB Fast Track Pro patch: patch -p1 /usr/src/linux/sound/usb/usbaudio.c < /usr/src/usbaudio-ftp-2.6.31.4.patch MT : export CONCURRENCY_LEVEL=4 Then run the following commands (please note that make dep is not needed any more for kernel 2.6):: make-kpkg clean fakeroot make-kpkg --revision=custom.1.0 --append-to-version=rt9.yomguy --initrd kernel_image kernel_headers modules_image ou:: fakeroot make-kpkg --append-to-version=.rt8-yomguy --initrd kernel_image kernel_headers modules_image ou: fakeroot make-kpkg --initrd --append-to-version=-yomguy kernel_image kernel_headers If the compilation stops with an error, run:: make clean and then re-run the previous commands starting with:: make menuconfig Change the kernel configuration where the error occurs. If no error occurs you will find the new kernel as a Debian package called kernel-image-2.6.8.1_custom.1.0_i386.deb under /usr/src:: cd ../ Now you have to install some packages that are needed by kernel 2.6. Add the following line to /etc/apt/sources.list:: deb http://www.backports.org/debian/ woody module-init-tools initrd-tools procps Then run:: apt-get update apt-get install module-init-tools initrd-tools procps If you are asked the following question: "If you really want to remove modutils type 'yes':" type yes. It might also be necessary to update packages like bind9, quota, etc. - depending on your configuration. If you have problems with your existing packages try to get the appropriate package from www.backports.org. Install your new kernel:: dpkg -i kernel-image-2.6.8.1_custom.1.0_i386.deb OPTION: Create a ramdisk of your new kernel (otherwise your system will most likely not boot):: cd /boot/ mkinitrd -o /boot/initrd.img-2.6.8.1 2.6.8.1 LILO: We are almost finished now. Edit the image=/vmlinuz stanza of your /etc/lilo.conf and add the line initrd=/boot/initrd.img-2.6.8.1:: ### # Boot up Linux by default. # default=Linux # image=/vmlinuz label=Linux read-only initrd=/boot/initrd.img-2.6.8.1 # restricted # alias=1 ### Run:: lilo to update your boot loader and reboot your machine:: shutdown -r now and if everything is ok your machine should come up with the new kernel. You can run:: uname -a SSH KEYS ======== www.linuxjournal.com/article/8400 !! home user dir MUST be 770 !! GPG APT KEYS ============= _:: sudo su gpg --keyserver hkp://keyring.debian.org --recv-keys F1D53D8C4F368D5D gpg --armor --export 010908312D230C5F | apt-key add - DEBMIRROR ========= _:: wget http://ftp-master.debian.org/ziyi_key_2006.asc Avoir une partition avec de la place, par exemple /mnt/mirror (~20 Go):: # apt-get install debmirror Pour creer / mettre a jour le miroir (pour les 3 distribs, par exemple) : $ debmirror /mnt/mirror --arch=i386 --dist=woody,sarge,sid -h ftp.fr.debian.org --nosource --verbose --progress Ensuite, dans /etc/apt/sources.list : deb file:/mnt/mirror sid main non-free contrib Et ï¿œvidemment faire un apt-get update pour mettre ï¿œ jour. WIFI ==== kismet airsnort aircrack wmwave wpasupplicant kwirelessmonitor macchanger swscanner wavemon wireless-tools wifi-radar iwconfig iwlist ZOPE ===== api python2.3-zodb Backup: python2.3 repozo.py -Bzv -r /nfs/place/where/backup/files/go -f /path/to/Data.fs Recover python2.3 repozo.py -Rv -r /nfs/place/where/backup/files/go -o /path/to/Data.fs ou Backup:/home/momo/data/tmp/test sudo python2.3 /usr/lib/zope2.8/bin/repozo.py -Bzv -r /home/momo/backups/parisson_zope -f /var/lib/zope2.8/instance/parisson.com/var/Data.fs sudo python2.3 /usr/lib/zope2.7/bin/repozo.py -Bzv -r /home/momo/backups/ev/plone/ -f /var/lib/zope2.7/instance/plone_EV/var/Data.fs Recover: sudo python2.3 /usr/lib/zope2.8/bin/repozo.py -Rvz -r /home/momo/backups/parisson_zope -o /var/lib/zope2.8/instance/parisson.com/var/Data.fs sudo python2.3 /usr/lib/zope2.7/bin/repozo.py -Rvz -r /home/momo/backups/ev/plone -o /var/lib/zope2.7/instance/plone_EV/var/Data.fs SHELL svn co http://svn.plone.org/svn/collective/dotipython/trunk/ipy_profile_zope.py . sudo su zope ./bin/zopectl shell ipython2.4 -p zope >> for id,val in obj.objectItems(): ... try: val.getId() ... except POSKeyError: break # "id" should now contain the id with the broken object. 9. You can now delete the "bad" object: >> obj.manage_delObjects(id) >> get_transaction().commit() # The second line is necessary to save your change. 10. In my case, I needed to re-create the bad user folder object: >> obj.manage_addUserFolder('acl_users') >> get_transaction().commit() If you needed to re-create a bad DTMLMethod, it would be something like: >> obj.manage_addDTMLMethod('method_id') >> get_transaction().commit() PLONE 3 / BUILDOUT =================== _:: easy_install -U ZopeSkel paster create --list-templates paster create -t plone3_buildout myproject cd myproject python bootstrap.py ./bin/buildout vi buildout.cfg ./bin/instance fg OV511 ===== _:: sudo modprobe ov511 sudo modprobe ovcamchip FUSERMOUNT ========== _:: encfs /path/.test /path/test (chmod 4755 /usr/bin/fusermount) sudo mount -a fusermount -u /path/test KERNEL REALTIME ================ _:: api realtime-lsm-source sudo module-assistant sudo modprobe realtime gid=29 AWSTATS ======= _:: sudo /usr/share/doc/awstats/examples/awstats_buildstaticpages.pl -update \ -config=/etc/awstats/awstats.conf \ -dir=/var/www/pypix.com/stats/ \ -awstatsprog=/usr/lib/cgi-bin/awstats.pl CSS ==== _:: #header { background: url(/images/main_header_bg.gif) repeat-x 0 0; line-height: 0.8;} GNUMP3D ======== song_format = $TRACK - $ARTIST - $ALBUM - $SONGNAME [ $GENRE - $LENGTH / $SIZE ] $NEW NVIDIA Debian ============= _:: nvidia-installer --uninstall apt-get install xserver-xorg-dev ou:: ./nvidia***.run --x-module-path=/usr/lib/xorg/modules/ http://wiki.debian.org/NvidiaHowTo http://www.nvnews.net/vbulletin/showthread.php?t=75175 ftp://download.nvidia.com/ WAV 2 MODEM =========== _:: sox file00.wav -r 7200 file.wav wavtopvf file.wav | pvftormd Rockwell 4 > standard.rmd PROXY ===== apt:: export http-proxy=http://adresse_proxy:port_proxy export "http_proxy=http://login:motdepasse@adresse_proxy:port_proxy" firefox:: foxyproxy COUNT ====== _:: ls -1 | wc -l PDF ==== _:: pdf2pdf pdfrop --margins '5 10 5 20' --clip Annexe_equation.pdf Annexe_equation2.pdf FLUMOTION ========== _:: sudo /usr/bin/flumotion-worker -D --daemonize-to /var/cache/flumotion -n default /etc/flumotion/workers/default.xml DOCBOK SGML2HTML ================ _:: db2html -o html telemeta.sgml EPSTOPDF ========= _:: epstopdf sch_thev_1.ps pdfcrop --margins '5 10 5 20' --clip sch_thev_1.pdf sch_thev_1.pdf DIFF ==== _:: diff -urNp ./ /home/momo/zope2.9/pre-barreau/Products/PloneTranslations/i18n/ > /home/momo/backups/pre-barreau/i18n.patch PYTHON ======= _:: import time time.strftime("%Y_%m_%d-%H_%M_%S") Exemple 10.6. openAnything :: def openAnything(source): 1 # try to open with urllib (if source is http, ftp, or file URL) import urllib try: return urllib.urlopen(source) 2 except (IOError, OSError): pass # try to open with native open function (if source is pathname) try: return open(source) 3 except (IOError, OSError): pass # treat source as string import StringIO return StringIO.StringIO(str(source)) 4 JAVA ==== _:: fakeroot make-jpkg jre-1_5_0_11-linux-i586.bin update-alternatives --config java DJANGO / TELEMETA ================== _:: python manage.py syncdb python manage.py sql telemeta sqlite3 test.db .list .schema ALTER TABLE "table_name" [alter specification] [alter specification] is dependent on the type of alteration we wish to perform. For the uses cited above, the [alter specification] statements are: * Add a column: ADD "column 1" "data type for column 1" * Drop a column: DROP "column 1" * Change a column name: CHANGE "old column name" "new column name" "data type for new column name" * Change the data type for a column: MODIFY "column 1" "new data type" QUCS ==== _:: ps2epsi sch_exam_ex1.ps OGG2MP3 ======= _:: oggdec -o - test.ogg | lame -V 6 - test.mp3 INSTALL DEBIAN SERVER ===================== _:: sudo apt-get install apache2 php5 mysql-server postfix icecast2 zope2.9 libapache2-mod-php5 arno-iptables-firewall python htop munin munin-node fail2ban python-imaging python-zodb POUTRER UN SITE (!) =================== _:: sudo /usr/sbin/ab -n 1000000 -c 100 http://www.redevanceculturelle.net/ FTP RECURSIVE =============== _:: yafc domain.com:/home get -rp * WEP === _:: sudo airodump-ng --write yomix.cap --channel 9 eth1 sudo airodump-ng --write yomix.cap --bssid 00:14:A5:8B:AF:0A --channel 9 eth1 sudo aireplay-ng -3 -e yomix -a 00:0C:F1:3B:3D:B5 -b 00:0C:F1:3B:3D:B5 -h 00:0C:F1:3B:3D:B5 eth1 sudo aircrack-ng -z yomix.cap CHROOT ====== _:: chroot ./ mount -t proc none /proc SSL (apache) ============= _:: sudo openssl genrsa -out privkey.pem 2048 sudo openssl req -new -key privkey.pem -config /etc/ssl/openssl.cnf -days 3650 -out cert.csr cp server.key server.key.org openssl rsa -in server.key.org -out server.key MENCODER ======== Mov to Flv Pour passer du format .mov ï¿œ .flv il suffit d'utiliser cette commande:: mencoder nom_de_la_video_encoder.mov -ofps 15 -ovc lavc -lavcopts vcodec=flv:acodec=mp3 -vop scale=largeur:hauteur -ffourcc FLV1 -oac mp3lame -o nom_de_sortie_de_la_video.flv (Note : Expliquer l'utilitï¿œ de -ofps xx) N'oublier pas de modifier la commande avec vos valeur de hauteur et de largeur . Mkv to Avi Pour passer du format .mkv ï¿œ .avi , il existe deux commande possible via mencoder:: mencoder nom_du_fichier.mkv -ovc copy -oac copy -o nom_du_fichier.avi for fichier in `ls *.mkv`; do mencoder $fichier -ovc copy -oac copy -o $fichier.avi; done mencoder -oac mp3lame -lameopts cbr=128 -ovc xvid -xvidencopts bitrate=900 nom_du_fichier.mkv -o nom_du_fichier_final.avi WIRED ====== _:: sudo apt-get install gettext cvs autotools-dev libxml2-dev libwxgtk2.6-dev wx-common libsoundtouch1-dev libsndfile1-dev libsamplerate0-dev dssi-dev libflac++-dev libvorbis-dev libasound2-dev export LD_LIBRARY_PATH=/usr/local/lib DJANGO ======== RESET PASS Deep:/opt/webapps/invisible bruce$ ./manage.py shell Python 2.5 (r25:51918, Sep 19 2006, 08:49:13) Type "copyright", "credits" or "license" for more information. IPython 0.7.2 -- An enhanced Interactive Python. ? -> Introduction to IPython's features. %magic -> Information about IPython's 'magic' % functions. help -> Python's own help system. object? -> Details about 'object'. ?object also works, ?? prints more. In [1]: from django.contrib.auth.models import User In [2]: users = User.objects.all() In [3]: users Out[3]: [] In [4]: users[0].set_password('whatever'); In [5]: users[0].save() TELEMETA IMPORT WAV =================== _:: ./manage.py shell from telemeta.models import MediaItem MediaItem.objects.filter(id='BM.2006.002.001--25__01-01') i = MediaItem.objects.get(id='BM.2006.002.001--25__01-01') i.file=('items/2008/09/01/CNRSMH_2006_002_001_01.wav') i.save() SVN ==== _:: svn propdel svn:executable mp3player.swf svn merge -r 119:head http://svn.parisson.org/svn/deefuzzer/trunk/ svn merge -r174:175 trunk/ tags/telecaster-0.4.0+rc1/ svn propedit svn:externals . deefuzzer http://svn.parisson.org/svn/deefuzzer/trunk DIFF ==== _:: diff -Naur olddir newdir > new-patch PATCH ===== _:: patch -p0 packages.txt sudo dpkg --set-selections < packages.txt sudo apt-get dselect-upgrade AMAROK ======= libxine1-ffmpeg PLONE 3 ========= python2.4 pil zodb elementree iw.fss ? RSYNC ===== _:: rsync -ra --update sudo rsync -a --include="*/" --include="*/Maildir/*" --exclude="*" /home/ root@jimi.parisson.com:/home/tmp/ SDPARM ======== _:: sdparm --command=ready /dev/sdc # check ready state sdparm --command=start /dev/sdc # start a sleeping disk sdparm --command=stop /dev/sdc # put a disk in standby sdparm -al -f /dev/sdc # list all known mode flags sdparm -6 -p po --clear=STANDBY /dev/sdc # turn off standby feature sdparm -6 -p po --defaults /dev/sdc # establish it again ANDROID ========== Tetherbot tunnel:: ./adb forward tcp:4444 localabstract:Tunnel android create avd -n my_android1.5 -t 2 emulator -avd my_android1.5 Running Scripts Externally Start python terminal:: $ adb forward tcp:4321 tcp: $ export AP_PORT=4321 $ python2.6 Python 2.6 Type "help", "copyright", "credits" or "license" for more information. >>> import android # The ASE android.py module should be on your sys.path. >>> droid = android.Android() >>> droid.makeToast("Hello from my computer!") >>> droid.speak('Hello') Proxy:: connect phone $ sudo /etc/init.d/udev restart $ adb forward tcp:8081 tcp:8081 CONEXTANT ========= _:: sh cnxtinstall.run -- --tty pppd call free http://www.linuxant.com/drivers/hsf/full/archive/hsfmodem-7.80.02.04full/hsfmodem_7.80.02.04full_k2.6.28_13_server_ubuntu_i386.deb.zip FFMPEG H264 Android =================== Convert a video to MP4 compatible with Android / Iphone:: ffmpeg -i inputfilename.ext -aspect 3:2 -s 480x320 -vcodec h264 -b 480k -r 23.976 -acodec aac -ab 96k -sameq -pass 1 outputfilename.mp4 Here is the command for a 4:3 aspect ratio video. ffmpeg -i inputfilename.ext -aspect 3:2 -s 400x300 -vcodec h264 -b 480k -r 23.976 -acodec aac -ab 96k -padtop 10 -padbottom 10 -padleft 40 -padright 40 -sameq -pass 1 outputfilename.mp4 And here is the command for a 16:9 aspect ratio video. ffmpeg -i inputfilename.ext -aspect 3:2 -s 480x270 -vcodec h264 -b 480k -r 23.976 -acodec aac -ab 96k -padtop 24 -padbottom 26 -sameq -pass 1 outputfilename.mp4 Extracting all frames from a video file is easily achieved with FFmpeg. Here's a simple command line that will create 25 PNG images from every second of footage in the input DV file. The images will be saved in the current directory.:: ffmpeg -i input.dv -r 25 -f image2 images%05d.png The newly created files will all start with the word "images" and be numbered consecutively, including five pre-appended zeros. e.g. images000001.png. From a video that was 104 seconds long, for a random example, this command would create 2600 PNG files! Quite messy in the current directory, so instead use this command to save the files in a sub-directory called extracted_images:: ffmpeg -i input.dv -r 25 -f image2 extracted_images/images%05d.png Moving on, let's say you just wanted 25 frames from the first 1 second, then this line will work:: ffmpeg -i input.dv -r 25 -t 00:00:01 -f image2 images%05d.png The -t flag in FFmpeg specifies the length of time to transcode. This can either be in whole seconds or hh:mm:ss format. Making things a little more complex we can create images from all frames, beginning at the tenth second, and continuing for 5 seconds, with this line:: ffmpeg -i input.dv -r 25 -ss 00:00:10 -t 00:00:05 -f image2 images%05d.png The -ss flag is used to denote start position, again in whole seconds or hh:mm:ss format. Maybe extracting an image from every single frame in a video, resulting in a large number of output files, is not what you need. Here's how to create a single indicative poster frame, of the video clip, from the first second of footage:: ffmpeg -i input.dv -r 1 -t 00:00:01 -f image2 images%05d.png Notice that the -r flag is now set to 1. If you want the poster frame from a different part of the clip, then specify which second to take it from using the -ss tag, in conjunction with the line above. Lastly, if you wanted to create a thumbnail story board, showing action throughout the entire length of the video clip, you'll need to specify the output image dimensions. Use the following line:: ffmpeg -i input.dv -r 1 -f image2 -s 120x96 images%05d.png My original file was 720x576, so the image dimensions are a whole division of this. RST === reStructured text to HTML:: rst2html -stg tips.txt tips.html rst2s5 --theme medium-black tips.txt tips.html rst2html -stg --stylesheet="lsr.css" --traceback tips.txt tips.html http://rst2a.com/gallery/html/ TELEMETA ======== apply the same wav file for all items (mysql):: update media_items set filename = 'items/test.wav'; FUNIONFS ======== merge multiple dirs :: funionfs -o dirs=1001:mama -o allow_other NONE media ICEDOVE ======== user_pref("network.protocol-handler.app.http", "/usr/bin/google-chrome"); user_pref("network.protocol-handler.app.https", "/usr/bin/google-chrome"); POSTFIX ======== postqueue -p postcat -q 9DF7520804A MAC ADDRESS (windows) ===================== c:\ping 192.168.0.2 c:\arp -a Xorg ==== Xorg -configure Xorg -config xorg.conf.new GIT === $ cd /var/cache/git/ $ mkdir project.git $ cd project.git $ git init $ echo "Short project's description" > .git/description $ git config --global user.name "Your Name" $ git config --global user.email "you@example.com" $ git commit -a $ git push upload master SWAP (clean) ================ sudo swapoff -a && sudo swapon -a JACK ===== Jackd, performances and harddisks 2010.11.30 So you have your sample loading working in a separate thread to your realtime audio code and the interface i/o communication is also tucked away in it’s own thread. You have a lock free mechanism for communicating between all threads and still, sometimes – when loading data from disk jackd chucks your program off for blocking – usually during a live performance, and you have to fumble around restarting the audio server. What’s going on? Well, it turns out that when your hard drive goes to sleep, the spin up resulting from a disk access request (such as mid-performance sample loading) can cause the kernel to block, which causes jackd to panic and either stop entirely or detach your client. This is even with jackd running with the –nozombies switch, so it must be the watchdog thread at work. The solution is simply to prevent your drive spinning down when you are performing, by adding “hdparm -S 0 /dev/yourharddisk” to your live audio startup script. Thanks to ClaudiusMaximus for helping me fix this at Piksel – it’s been bothering me for ages. Categories : howto slub