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11th July 2020, 18:19 | #1 | Link |
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encoding setting for tv-series
Hi guyus
I need some advice for encoding tv series 1080p and 720p, i read the x265 documentation but for tv series what are you recommend me about the aq-mode, open-gop, -me, -subme, -tune ssim or not, -preset??? please. My laptop : Asus ROG STRIX, RTX 2060, 16go RAM, I7-9750H |
11th July 2020, 20:08 | #2 | Link | |
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Just start with --preset slower, and then pick a faster preset until you get fast enough. Tweaking most of the other stuff is more context specific. Well, it's probably safe to include these recent parameters that haven't been added to the presets yet
Preprocessing correctly if the source is interlaced is going to be a way bigger factor in final quality than anything above. |
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12th July 2020, 18:56 | #4 | Link | |
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12th July 2020, 19:24 | #5 | Link | |
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Maybe in the future i will buy a computer |
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12th July 2020, 20:05 | #6 | Link | |
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The concern is more about long term temperatures, if your laptop is not really hot while encoding it is probably fine.
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Instead of worrying about the average bitrate it would be better to pick the highest CRF that gives a quality you like. CRF is great but with fast first pass using two pass encoding is a pretty minor performance hit and is the best option if you have storage constraints or simply want each show to be a similar size.
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12th July 2020, 22:31 | #7 | Link | |
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Your choice boils down to controlling bitrate and letting quality vary, or controlling quality and letting bitrate vary. Like lots of "what's the best way..." question the answer is really dependant of the specifics of what you are trying to accomplish. Also, given you are on a laptop, the right balance between bitrate and encoding speed also will matter. How many minutes of encoding per hour do you need to achieve to justify how much reduction in bitrate? If your encoding project is optimally successful, what are the parameters of that success? |
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13th July 2020, 09:23 | #8 | Link | ||
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Most laptops overheat quickly. Quote:
For instance, although I try to encode on a Xeon with a Desktop all the time, when I'm with my laptop (which has an i7 6700HQ), I turn the fan to the maximum speed, I downclock it from 2.60GHz to 1.66GHz and then I let it encode. Temperatures are fine in the 50-58°C range. Sure, it takes forever to encode in H.265 (about a week for 24 min in 4K 23.976p 10bit) but it's worth it 'cause if I leave it the way it is, at 3.50GHz turbo boost, it quickly gets to 95° and then gets throttled 'till it goes to 88° and then it goes back to 95° on all cores. It doesn't matter if you change thermal compound with the artic cooler one, put 4 additional fan underneath the case and another 5000 RPM fan on the side to extract hot air, it will always still overheat unless you downclock (and downvolt) it. Honestly, I don't know what laptop manufacturers have in mind, but clearly they seem to gamble on the fact that "people will never use the CPU at 100%, they'll probably just go to twitter, facebook, instagram and outlook" and they just don't care about stress tests... So in a nutshell: yes, you can encode on a laptop, provided that you downclock/downvolt it and you keep temperatures under control with software like Speccy (if you're on Windows) or lm_sensors (if you're on Linux). Last edited by FranceBB; 13th July 2020 at 09:26. |
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13th July 2020, 12:49 | #9 | Link | |
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13th July 2020, 13:26 | #10 | Link | |
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To expand on Benwaggoner answer. I would start by deciding on the timeframe of encoding, how much time are you willing to spend on the entire project. Then spend 10-20% of this time on testing the encoders with 30-60s sample to select "the best" codec at proper preset(crf or 2-pass+speed preset+resolution) to match intended encoding speed. I would suggest testing x264, x265, and nvenc because the encoding speed is a significant consideration. If the video has grain use denoiser. At 1500kbps 1080p may be bit-starved, so probably 720p would be better. Then eventually spend 5-10% of the time on fine-tuning, but I doubt it will make a big difference.
There's no universal solution. Each video is different and compressibility varies. For "the best" results tests and tweaking is necessary. Regarding laptop longevity... I think it's broscience. I'm no professional and it's only anectodal evidence, but I am killing 4200H for 6 years(probably like half a year of constant worktime) running it at 95C and it still works. While there exists solid theory behind reducing longevity by high temperatures, there's no actual data. Besides, I would be much more afraid of stresses caused by temperature gradient rather than by constant high temperature. Quote:
Last edited by alfik0; 13th July 2020 at 13:28. |
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13th July 2020, 15:35 | #11 | Link | |
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13th July 2020, 16:26 | #12 | Link | |
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13th July 2020, 17:05 | #13 | Link |
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Even desktops can get overheated. My newish dual Xeon workstation would sometimes crash under sustained heavy load, particularly when GPU and CPUs were both hitting hard. I needed to increase the minimum fan speed for my overnight renders to reliably complete overnight.
In the end, pretty much everything in computing winds up being heat limited. Pixels-per-picojoule is a metric I've used before in encoding and decoding tuning. |
15th July 2020, 01:58 | #14 | Link | |
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