32-bit is significantly faster than 64-bit

Discuss about generic usage of MediaCoder.

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edd
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32-bit is significantly faster than 64-bit

Postby edd » Tue Mar 08, 2016 5:12 pm

I installed both 32-bit and 64-bit MediaCoder v-0.8.41.5818. When encoding the same video with the same settings, the 32-bit version its significantly faster than the 64-bit version. I would expect the opposite. Am I doing something wrong?

Here's the numbers (from the summary screen at the end of encoding):

32-bit
Time Elapsed: 420.2 seconds
Total Duration: 2565.6 seconds
Overall Speed: 6.2X
Overall FPS: 262.4 fps

64-bit
Time Elapsed: 549.7 seconds
Total Duration: 2565.6 seconds
Overall Speed: 4.7X
Overall FPS: 193.1 fps

source video (from a video camera):
MP4, 1280x720, 4000 bitrate, 25 fps, with AAC 48000 Hz, 128 bitrate

settings:

video: bitrate 1200, rate mode 2-pass, format H.264, encoder NVENC, GPU
audio: format LC-AAC, encoder nero, resample 32000 Hz
picture: resize 960x540, frame rate 20, aspect ratio set DAR 16:9

system:
Windows 7 64-bit
AMD Phenom II X6 1055T
8 GB RAM
nVidia GTX 750 Ti with latest drivers v361.91
stanley
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Re: 32-bit is significantly faster than 64-bit

Postby stanley » Tue Mar 15, 2016 8:45 pm

That's weird. Have you compared speed of CPU encoding?
When things work together, things work.
edd
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Re: 32-bit is significantly faster than 64-bit

Postby edd » Mon Apr 04, 2016 8:53 am

I used a difference source file to compare CPU 32-bit vs 64-bit, because I couldn't remember which one I used for the GPU test.

When using CPU, the 32-bit and 64-bit versions perform almost identically. Its odd that the overall speed is faster for 64-bit, but the overall FPS is faster for 32-bit.

32bit
Time Elapsed = 1031 seconds
Total Duration = 1826.3 seconds
Overall Speed = 1.8X
Overall FPS = 74.8 fps

64-bit
Time Elapsed = 965.5 seconds
Total Duration = 1826.3 seconds
Overall Speed = 1.9X
Overall FPS = 60.4 fps
JXL221
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Re: 32-bit is significantly faster than 64-bit

Postby JXL221 » Fri Apr 08, 2016 10:47 am

I've had trouble with some builds being faster then others. However I have found the 32bit builds don't work at all.
NailMan
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Re: 32-bit is significantly faster than 64-bit

Postby NailMan » Wed Apr 20, 2016 2:57 am

I also confirm this fact. 32-bit version runs significantly faster than 64-bit.

I tested a MediaCoder Premium(v5829,v5822) with video transcoding splitted FRAPS-files(4Gb) to MP4 file with grouping.
My computer config:
i7-4930K
GTX980(SLI, but for MC used "One GPU" setting)
32Gb memory

I use only NVENC x264 with defaut settings (preset - High quality, dev -CUDA, Bframes-2, GOP-250).

64-bit version encoding - 67-90 FPS (81FPS average for 7 minutes coding)
32-bit version encoding - 96-130 FPS (112 FPS average for 7 minutes coding)

And out of sync audio/video has been seen in 64-bit v5829 (about 1.5s in 3 minutes video duration). 32-bit version is not seen out of sync.
stanley
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Re: 32-bit is significantly faster than 64-bit

Postby stanley » Sat Apr 23, 2016 9:52 am

When things work together, things work.
fredbe9300
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Re: 32-bit is significantly faster than 64-bit

Postby fredbe9300 » Wed Aug 17, 2016 10:16 am

i was wondering if I would find in the forum a reason why the default decoder was switched from mencoder to ffmpeg. (in the build of July 2016)

this is the most recent discussion were there is a hint of mencoder vs ffmpeg, merely through the question of Stanley.

Does it have something to do with the change?

ps: I don't care for one or the other... i'm just always wary when defaults change. Wondering if it's a good thing and why ;)
stevesmith
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Re: 32-bit is significantly faster than 64-bit

Postby stevesmith » Fri Mar 31, 2017 5:38 pm

Hello everyone
i want to know more about this . can you tell me please ?
best regards
stevesmith
I am a content writer in UK.

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