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17th September 2019, 15:56 | #1 | Link | ||
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Help with removing artefacts from encode
Hi
First of all, I am complete noob. So sorry for any "stupid" questions where you all may know the answers. tl;dr I am trying to do 4k HDR HEVC encode from BR and as result I get these artefacts in some dark scenes https://i.imgur.com/XylLpHe.jpg and here is the same area in original video https://i.imgur.com/YQUWWG8.jpg I am using ffworks I tried to increase bitrate and some changes. The only improvement I have seen was when I changed Coder type from Arithmentic (CABAC) which is as default to NONE. And Scaler to Accurate rounding. But at the end I am still getting artefacts. Here are the parameters I am getting (2 pass encode) Quote:
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Thanks in advance for any advice Last edited by Oblak; 17th September 2019 at 15:59. |
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17th September 2019, 16:03 | #2 | Link | |
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Why so little buffer? Why maxrate = avg. bitrate?
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17th September 2019, 18:50 | #3 | Link |
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This is very odd, why is there a none option? Arithmetic coding is like zip compression, it should not affect quality, just size and decoding requirements. What is this controlling? I am not familiar with ffworks but it sounds like it has some non-standard options or something?
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madVR options explained |
18th September 2019, 05:43 | #6 | Link |
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thank you for replies
@Asmodian - that should be -coder parameter in ffmpeg no idea why it is turned on @sneaker_ger reason is that I locked bitrate at 20k. @Natty - posted export was done from sample. I did 2 pass on full video, artefacts were still there and looked the same. regardig command line, as mentioned in first post I am using ffworks, there is no command line |
21st September 2019, 10:28 | #8 | Link | ||
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I tied, got little bit better result, but it still needs improvement. Again I am no expert on this stuff, but I believe it would be one of those stupid settings which need change, not only bitrate... anyway here is result https://i.imgur.com/PT75Zvn.jpg Quote:
Last edited by Oblak; 21st September 2019 at 10:41. |
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21st September 2019, 10:58 | #9 | Link |
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ok I noticed new thing, I tried to change YUV420p10le to YUV420p12le and this is result https://i.imgur.com/96mjJt9.jpg. It is not "perfect", but it is for sure huge improvement and result is good enough for me.
So is there any way how to achieve this with YUV420p10le? If I leave it on YUV420p12le can this cause some trouble with playback in different devices/players? Thanks |
21st September 2019, 13:15 | #11 | Link |
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Such a big difference between 10 and 12 bit is unexpectet. The problem is few people here know or use ffworks. It's hard to tell what is does internally. Can you cut e.g. 30 seconds from the problematic part using mkvtoolnix (or ffworks in video copy mode if that is possible)? Then others can test if they have the same problem with x265 or if it is a problem specific to ffworks.
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21st September 2019, 15:12 | #12 | Link | |
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21st September 2019, 19:58 | #13 | Link | |
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@HolyWu good find!
I stopped it after few frames. This is my original config with limited framerate.. just to give idea what is going on when doing encode Quote:
@sneaker_ger what software do you recommend? I thought ffmpeg is the thing most people use.. again I am noob in this here is the sample. not sure which hosting is best so I hope mega is ok for you 307MB Last edited by Oblak; 22nd September 2019 at 20:16. |
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22nd September 2019, 20:14 | #15 | Link |
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I am not able to simulate this issue on other video so I had to post 30s from the original
but yes, you can be a proactive good boy, report it to mods and get it removed you will maybe even get a cookie for being such a good boy. but don't help finding solution to this specific technical issue which can maybe help lots of other people in future. |
23rd September 2019, 03:26 | #16 | Link | |
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You've edited your post to take out the original filenames, and then you turned hostile on me when I pointed out that you actively broke the rules. Rules that keep this board safe. |
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