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10th September 2008, 12:47 | #1 | Link |
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GPU transcoding
Hi. I know that badaboom is not yet there and CUDA-only. On the other hand the sheer numbers of stream processors of ATI's Radeon HD4670 and 4850 made me order two today (at that price, who can resist?) - and then cancel the order.
Why? The Radeon HD 48xx series promises "Accelerated Video Transcoding", the 46xx does not. And the AVIVO video transcoding app from ATI is Radeon X1xxx-only. I wanted to use those two 4670 in crossfire mode to do all that transcoding to h264 that I was too lazy to do old-school, since even though I have a Q6600 transcoding in good quality takes time. Plenty of it. So could please someone enlighten me on what ATI means when they post "Accelerated Video Transcoding (AVT)"-capabilities of their newer cards - just that someday in the future someone may or may not have written an app that uses the ATI Video transcoding API? I did google and search the forum, but found no answer. Last edited by jofarmer; 26th September 2008 at 09:01. Reason: typo |
10th September 2008, 13:11 | #2 | Link | |
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So transcoding in good quality will take months or years . |
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10th September 2008, 13:26 | #3 | Link |
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GPU transcoding is always fast but horrible quality.
x264 running on a fast CPU (Q6600) gives you the option to be either as fast (or faster) with same low quality as GPU, or slower but better quality. |
10th September 2008, 14:22 | #4 | Link |
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Yeah. Back when I had a powerbook I had a Turbo.264 - quality WAS noticably worse than using x.264 or even quicktime h.264.
But I found some answers by now: seems like nothing is there yet and PowerDirector should have that functionality... anytime soon now. http://forums.anandtech.com/messagev...readid=2208040 http://forums.amd.com/game/messagevi...threadid=97340 http://forums.techpowerup.com/showthread.php?p=855745 sorry for starting this thread with a question that was answered elsewhere, but maybe this is interesting news to some after all. Cheers! |
10th September 2008, 14:27 | #5 | Link | |
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If only handbrake would extend its support to HD formats... |
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10th September 2008, 15:41 | #6 | Link | |
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10th September 2008, 15:46 | #7 | Link |
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RipBot264, MeGUI, StaxRip, AutoMKV, and AviDemux are all excellent GUIs. I much prefer them over HandBrake, which is quite limited, especially since it can't even do AviSynth, can only convert from DVDs, and can't use new/custom mencoder/x264 versions.
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10th September 2008, 16:15 | #8 | Link |
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If you use the current SVN, the second two can be done. The second is already implemented, and the 3rd is trivial. I haven't programmed regularly since I was 13 and I can amend the build system to include whatever patch I need for x264 easily.
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11th September 2008, 02:03 | #10 | Link | |
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11th September 2008, 11:55 | #11 | Link |
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Thanks a lot!
This is indeed a very good app and does exactly what I was hoping to do. Since my normal routine would be to decode the BD to yuv and then let x264 work its magic, your app saved me a LOT of disk space. And the quality I got was very good, I am very satisfied - so thank you, for coding it, and for telling me about it; I am very new to using Windows as a platform, its OS X and Ubuntu for me. But new technology always takes time to come to these platforms, so...
But my initial interest in GPU transcoding remains: creating a BD9 took around 6 hours with my Q6600 (and it kept muxing for two till I aborted, but sound was fine). |
11th September 2008, 14:51 | #12 | Link | |
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11th September 2008, 17:13 | #13 | Link |
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When I start transcoding a 1080p movie, I usually come back after 3 1/2 days.. Muxing only takes 5 mins though.
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11th September 2008, 21:27 | #14 | Link |
Derek Prestegard IRL
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Yeah - when I do a BluRay rip I typically use CRF mode, and little to no AviSynth filtering (fft3dgpu to clean chroma if its noisy).
I start an encode when I go to bed, and it's always done by the time I get home from work the next day (18 hours later +/-). If I could get the same quality in hardware at faster speeds, I would love to do so, but I can't Core i7 will help things! ~MiSfit
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12th September 2008, 08:40 | #15 | Link |
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Review of GPU Encoders
http://www.maximumpc.com/article/fea...really_upon_us via slashdot http://hardware.slashdot.org/article.../09/12/0156222
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12th September 2008, 13:19 | #17 | Link |
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Whew, what I expected. Good thing I went with my Q6600, then ;-)
But still I have high hopes in the ATI 4xxx series GPU with 320 to 800 stream processors. I know, not directly comparable to nVidia's number of stream processors, bus as soon as both (so far only ATI) support OpenCL, things will start to get really sweet... |
12th September 2008, 15:46 | #18 | Link | |
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Never buy hardware for future potential features or you'll always be disappointed. |
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