Can BD Rebuilder use 64X

[rotty]

Can Bd Rebuilder take advantage of 64 bit PC's, i.e. encoded faster.

[deank]

If you have 64bit avisynth or with the 'tweaks' to enable 32bit avisynth you may get about 1 frame/second faster encoding which will lead to about 10-15mins shorter encoding time for a 10 hour running encode... It's not worth the troubles. 32bit avisynth + 32bit x264 is proved to work flawlessly.

[nurbs]

Using 64bit x264 isn't really that complicated. You just have to use a wrapper like avs4x264 or vfw4x264 to get the output of 32bit avisynth to 64bit x264. The only thing you'd have to change is the .exe you call since the wrappers pass the cli arguments on to x264. I haven't tested it myself, but I read that it gives up to 10% faster encodes. Shaving up to an hour off your hypothetical 10 hour encode by adding 4 letters to the command line isn't really that much of a hassle.

[deank]

I haven't tested it myself, but I read that it gives up to 10% faster encodes.

Right... And because most avisynth filters are 32bit you can't get these 10% ever... It is not that x264 64bit is that much faster, it is that avisynth is not that faster and x264 just waits for the frames.

[nurbs]

Is there a point you want to make? There are posts here on doom9 where people compare speeds and that's where I take the numbers from. Maybe when my encodes for today are complete I'll make some tests myself, but I don't see how that would convince you since you'd still just post "Right..."

[deank]

Because a lot of tests are with PNG series of images or avisynth scripts without any filters. I read the posts, too.

I don't say there is no difference, but I can't agree with 10% speed improvement. I'll do some more tests to prove myself wrong (using win7 64bit with 64bit x264).

[nurbs]

Alright. Two sources (1 DVD/ 1 Blu Ray), 10 encodes with 2000 frames for each source, half of them 64bit.
SD: --preset slow --tune film --crf 20; DGDecode, Colormatrix, LanczosResize to 720x400
HD: --preset slow --tune film --crf 21; DGDecodeNV, Nvidia Resizer to 1280x720
The 64bit SD encodes are ~7.5% faster the HD encodes ~6.6%.

If avisynth can't serve frames fast enough 64bit won't help you, but if you don't do much more than decoding, cropping and resizing in the script, which is probably what happens when encoding the main feature of a BD with BDRebuilder, you get a nice speed boost for free. And it's not that difficult adding it to encoding applications.