It turns out that Inter­net Explo­rer caches AJAX requ­ests (how cle­ver). If you’re using $.ajax(), you can pass cache: fal­se option to it, but if — like me — you’re using $.get() and $.post(), just use

$.ajaxSetup({cache: false});

some­whe­re at the start of your script.

Mostly for my futu­re refe­ren­ce. ‑thre­ads 8 sho­uld be chan­ged to the num­ber of CPU cores (my i7 has 4 with HT, thus I set it to 8).

ffm­peg ‑i input.avi ‑aco­dec lib­fa­ac ‑ab 48k ‑vco­dec libx264 ‑vpre fast ‑vb 500k ‑thre­ads 8 ‑f flv output.flv

Mostly note to my self for futu­re reference.

What they don’t tell You in the tar bac­kup tuto­rial is that it’s not eno­ugh to edit /etc/fstab (and the­ir instruc­tions for grub are for grub-legacy).

Becau­se after resto­ring you pro­ba­bly have new par­ti­tion UUIDs, you must:

• boot livecd
• mount your root fs
• mount -B /dev /rootfs/dev, etc. (with proc and sys at least) to be able to chro­ot from livecd to your root fs
• chroot /rootfs
• edit /etc/fstab and chan­ge UUIDs the­re (new ones you can get using blkid
• do sudo dpkg-reconfigure -plow grub-pc to auto­ma­ti­cal­ly upgra­de grub con­fig files, just let it install to the drive(s) it was on
• do update-initramfs -u so UUID sto­red insi­de ini­tramfs get upda­ted, too

Then you sho­uld be able to boot it.

Install Vir­tu­al­Box Guest Addi­tions in Win­dows’ safe-mode so sys­tem file pro­tec­tion doesn’t inter­fe­re with the instal­la­tion, it’s that sim­ple and fixed all my Vir­tu­al­Box per­for­man­ce problems.

IE can’t do any­thing right. If you save some gra­phi­cal ele­ments to PNG, and try to put them on an area with CSS-defi­ned color, the­re will be a dif­fe­ren­ce even if you used the same color in the PNG — IE ren­ders PNGs dar­ker than it sho­uld. The reason for this is misin­ter­pre­ta­tion of gAMA fra­me saved in PNGs that makes it possi­ble to bet­ter color-match pic­tu­res. The fix is to remo­ve this fra­me, and doing it on Ubun­tu is as easy as:

aptitude install pngcrush
cd your-graphics-directory
mkdir fixed
find . -type f -exec pngcrush -d fixed -rem cHRM -rem gAMA -rem iCCP -rem sRGB {} \;


Now you have a „fixed” direc­to­ry whe­re you have PNGs that will work pro­per­ly in IE (and are a bit smal­ler which is a nice side effect). If you’re sure they­’re ok, just do

mv fixed/* ./
rmdir fixed


Tha­t’s all.