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Old 3rd December 2013, 11:45   #1  |  Link
leftspeaker2000
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Noise / Film Grain Stargate Sg1

Hey Everyone,

I ripped all my Stargate SG1 DVDs to h.264 MKVs using two pass encoding. The files are around 350 to 450 mb average depending on the audio.

I have recently been watching the whole series again and I have noticed the first series, in some episodes has what appears to be a lot of noise of film grain in some regions (mostly dark regions)

It does not look like bockyness from low bit rate and the later episodes don't seem to have the problem. I think the original episodes were not filmed very well.

What is a good way to remove this grain / noise using Megui ?

Last edited by Guest; 3rd December 2013 at 13:34. Reason: rule 12
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Old 7th December 2013, 13:14   #2  |  Link
leftspeaker2000
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Hey everyone,

Sorry I probably did not provide enough details.

I have attached a few pictures of the problem and a link to a sample of the grain that I am trying to remove. http://www.sendspace.com/file/ms6mr7


I would really appreciate if some one could take a look and give me an idea how to tackle this problem. I have tried to use degrainmedian filter which seems to have worked a little ( granted, I am not that experienced with plugins with megui so it might not have done anything)



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Old 7th December 2013, 16:20   #3  |  Link
Sparktank
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Your work process chain is unclear.

The sample video shows it's encoded at crf=16.0.
Are you using your 2-pass encodes to denoise and convert a second time with crf?

Why not re-rip the discs and convert from those instead of a second-gen encode? The DVD is lossy encoded and your first 2-pass rip is a lossy encode of a lossy encode.

Three times the lossy encode is...
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Old 7th December 2013, 19:41   #4  |  Link
ChiDragon
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("MPEG-4 Encoder GUIs" is a really weird subforum to put this in.)

You should have posted a sample from the DVD VOB instead. The S1 PAL DVD that I have doesn't look anywhere near as bad as your H.264 encode.

They do have quite heavy film grain that became video noise during SD mastering, and temporal DNR (the first frames at scene changes show the full noise level and then it immediately drops). This noise filter causes some pretty ugly hanging noise. I think the US DVD may not have been afflicted by this.
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Old 10th December 2013, 18:11   #5  |  Link
cybersharky
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Those images are upscaled
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Old 15th December 2013, 10:58   #6  |  Link
ricardo.santos
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Back in 2006 i was doing the same thing but from vhs, by the images it looks like the same problem:

http://forum.doom9.org/showthread.php?t=112993


hope it helps
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