OpenCL Nightly Builds

Post by **HandBrake** » Sat Dec 22, 2012 4:28 pm

We now have nightly builds available for the new OpenCL acceleration code within HandBrake thanks to the hard work by the Multicoreware inc team and AMD.

* WARNING *

We've found that hardware decoding support is unreliable and triggering crashes in the graphics driver.
Since this crash is happening in the kernel space, it has the potential to crash your system to the point a reboot is necessary.

We therefor highly recommend that you do not use this on mission critical systems or environments where you could suffer a loss of work due to a spontaneous reboot.

What is accelerated

- Accelerated Crop and Scaling filter. (Performance gains can be seen, only when down-scaling.)
- Hardware Decoding. Note this only works for files that we currently decode via LibAV. DVD, Bluray and Transport Streams do not have hardware decode support.

Builds provided

Windows x86 and x64 Command Line Interface.
Please note that normal nightlies do not include these patches!

How to use it

-P Use OpenCL Cropping and Scaling
-U Use UVD hardware

Download

https://build.handbrake.fr/view/OpenCL/

Feedback

In order for this patch to be committed into the core branch, it needs a lot of testing and feedback. For those of you who decide to try this build, we'd appreciate it if you provide information about what hardware your running and include encode logs for both successful and failing encodes.

If you experience crashing or poor performance, try with -P only, then -U only to localize the crash.

Feedback can be left in this thread.

AAT · Post by **AAT** » Sun Dec 23, 2012 9:42 pm

I'll be happy to test the OpenCL build on AMD A8-3550MX, especially I have results from version 0.98 for to be able track the difference! However please advice how to run the Nightly Builds. I've downloaded the HandBrake-5103svn-x86_64-Win_CLI.zip file and inside I have two folders and HandBrakeCLI.exe. Not sure how to run the program

mduell · Post by **mduell** » Mon Dec 24, 2012 2:12 am

AAT wrote:I'll be happy to test the OpenCL build on AMD A8-3550MX, especially I have results from version 0.98 for to be able track the difference! However please advice how to run the Nightly Builds. I've downloaded the HandBrake-5103svn-x86_64-Win_CLI.zip file and inside I have two folders and HandBrakeCLI.exe. Not sure how to run the program

http://trac.handbrake.fr/wiki/CLIGuide

AAT · Post by **AAT** » Mon Dec 24, 2012 8:59 am

Thanks, I might will learn those DOS commands and figure out my handbrake pre-settings but I would prefer the easier window way. I actually learned just simply overwrite the staffs inside my Handbrake 0.98 installation folder with the nightly build than run handbrake.exe
It is working, but unfortunately I cannot open my test videofile, says; error, no titles found, your source may be copy protected, badly mastered...etc...

Smithcraft · Post by **Smithcraft** » Mon Dec 24, 2012 10:10 am

For testing, what do we need to look for, and what should we report?

Also, since cropping is a new part, I would imagine we need something that needs cropping?

SC

Post by **s55** » Mon Dec 24, 2012 11:01 am

@AAT -> I'm adding builds for the GUI. These will be available shortly.

@Smithcraft -> Crashes, Performance increases, decreases etc. Even logs for sucessful encodes are useful to us as it'll allow us to catalog compatible hardware.
Leaving it on auto-crop should be ok, but feel free to try some bonkers numbers.

We are not expecting any large increases at this point as scale/crop and decoding don't take up a large pollution of the cpu time taken. It's pretty small so is more likely to benefit APU's. I haven't actually tested this latest patch myself but the last one was showing in order of a few % difference.
I did see 10~20% increase with the x264 lookahread. This isn't included yet but hopefully will be in the near future.

AAT · Post by **AAT** » Mon Dec 24, 2012 12:06 pm

I like the new interface, but ain't scan well my video file yet.