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Youtube Compression Undoing Some of Neat Video's Work

 
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Noisy Nick



Joined: 06 Dec 2013
Posts: 3

PostPosted: Sun Dec 08, 2013 6:09 pm    Post subject: Youtube Compression Undoing Some of Neat Video's Work Reply with quote

I've uploaded a Neat Video, noise-reduced video to Youtube:

http://youtu.be/cWmCPQ_j9yU

The original raw video, with noise, is also uploaded for reference:

http://youtu.be/Y-sLtrKGxJ8

You might need to watch in fullscreen to notice the difference!

I'm using Sony Vegas Move Studio, a temporal filter radius of 5, Adaptive Filtration, sharpening on the Y channel, High Freq., of 120%, Noise Reduction in Y of 70% (versus 60% default) and Noise Level of +75% in High Freq.. Everything else is default. These parameters may be slightly secondary as it seems Neat Video is doing a good job; it maybe more an issue with the rendering in Vegas and subsequent compression by Youtube.

I'm rendering to Sony AVC, 1920 X 1080, High Profile, CABAC, bit rate of 16Mbps (the max. available), MPEG-2 transport stream (*.m2ts).

Thing is, I'm getting some compression artefacts or pixellation (if they're the right words) on e.g. the yellow walls in the right corner. Now, I'm not sure whether this is strictly speaking noise but it's like Youtube has brought some "noise" back into the video. The file is fairly compressed as the original is 750Mb and the Youtube (MP4) version is only 75Mb.

Here is 40sec of the noise-reduced source video, after it's been rendered by Sony Vegas but before it's been compressed by Youtube:

http://we.tl/eOTqhk5eAQ

It seems Neat Video has done a decent job removing the noise in the above?

Again, for reference, I've uploaded 40sec of the original raw video, with noise, and again before it's been compressed by Youtube:

http://we.tl/Jl68QDs9V5

So, finally, my question is does anyone know of more optimal set of render settings to avoid the artefacts on Youtube?
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NVTeam



Joined: 01 Sep 2005
Posts: 2238

PostPosted: Mon Dec 09, 2013 12:58 pm    Post subject: Reply with quote

Yes, it looks like Youtube re-compression has added new compression artifacts into the video. I am not sure you can completely avoid them, unless you can adjust the re-compression settings used by Youtube. You may want to check if there are any adjustments available there and/or ask Youtube support whether any adjustments are in principle possible at that stage of their re-compression.

If they do not offer any solutions then perhaps adding some artificial noise into the final video might help. The noise has to be small enough to keep it not very noticeable in the eyes of viewers yet strong enough to prevent the compression codec from creating those artifacts. This may or may not help, some experimenting is needed.

Vlad
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noise reduction for video and photos
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