Thank you for purchasing through links and ads on this site.
OWC / MacSales.com...
diglloyd Deal Finder...
Buy other stuff at Amazon.com...
Handpicked deals...
$2499 $1399
SAVE $1100

$400 $280
SAVE $120

$1798 $1598
SAVE $200

$3297 $2797
SAVE $500

$3397 $2797
SAVE $600

$150 $90
SAVE $60

$1398 $898
SAVE $500

$3698 $2998
SAVE $700

$2998 $2498
SAVE $500

$1799 $1329
SAVE $470

$1999 $1199
SAVE $800

$2299 $1599
SAVE $700

$2399 $2049
SAVE $350

$2799 $2399
SAVE $400

$2799 $1899
SAVE $900

$1199 $920
SAVE $279

$997 $897
SAVE $100

$2099 $1699
SAVE $400

$1999 $1369
SAVE $630

$1999 $1599
SAVE $400

$1349 $949
SAVE $400

$4499 $3099
SAVE $1400

$4499 $3999
SAVE $500

$329 $329
SAVE $0

$1499 $1029
SAVE $470

$1499 $1289
SAVE $210

$2199 $1999
SAVE $200

$3399 $2199
SAVE $1200

Upgrade the memory of your 2019 iMac up to 128GB

Optimizing Handbrake for Faster Video Conversion

Last updated 2010-09-02 - Send Feedback
Related: CPU cores, Mac Pro, optimization, software, video

Handbrake converts DVD video to formats that can be played on the computer, the iPod/iPad/etc or any conventional player.

While Handbrake makes far better usage of multiple cores than most programs, it doesn’t scale much beyond 9 cores (as of August 30, 2010). Perhaps a future release will address this limitation.

This approach makes sense on the 12-core Mac Pro, with its ample CPU core reserves. It will likely show little or no advantage on 4-core machines, or might even be slower (not investigated, an exercise for the reader).

Shown below are timed results encoding the same four movies totaling about 3 hours of video, using these settings. The faster results for each Mac Pro used two copies of the Handbrake application running at the same time. Surprisingly, even the 6-core machine benefits from this approach, though not as much.

For a big queue of jobs, the 26% time savings is very attractive (640 vs 874).

Results will vary somewhat with the settings and material chosen for conversion, but both the 12-core and 6-core Mac Pro show clear benefits; 28% for the 12-core and 12% for the 6-core.

With dual apps, the 12-core machine cuts the runtime by 40% as compared to the 6-core.

Two Handbrake applications simultaneous compared to one.
Using the Handbrake beta build as of August 30, 2010.

How to do it

Here’s how:

  1. Duplicate the Handbrake application;
  2. Launch both copies of Handbrake;
  3. Add video to be converted to the queue in each Handbrake program, balancing the material between them so that both queues have approximately the same work to be processed.
  4. Start both copies running.
128GB Memory in iMac 5K $679

128GB in 2019 iMac 5K is what Lloyd uses!
Up to 64GB for 2015/2017 iMac 5K

TWICE the memory for $320 *less* than Apple charges for 64GB!!!

64GB for Mac mini only $335

CPU core usage

Shown below are two copies of Handbrake running simultaneously on the 12-core.

This is what you want to see on a 12-core system. The less than helpful display of all 24 virtual cores suggests that there is untapped CPU power, but that’s not really true; there are twelve hardware cores, and they are being fully used; virtual cores (hyperthreading) are slightly better than useless.

CPU core usage with Handbrake, two applications simultaneously
2010 Mac Pro 12-core @ 3.33GHz

Settings

Settings used for encoding the video.

Setting used for testing Handbrake

Save the tax, we pay you back, instantly!
View all handpicked deals...

Samsung 2TB T5 Portable Solid-State Drive (Black)
$400 $280
SAVE $120

diglloyd.com | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2019 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__