Need Help With Video Pixellating Issue

daniel-m7153 wrote on 8/18/2018, 3:38 PM

Hello all, just looking for some advice. I'm on Vegas Pro 13 atm, and sometimes my video renders produce this odd "pixellating" effect in certain places. It usually happens when there's some quick movement onscreen, i.e. a transition or an object flying on and off. For the life of me I can't figure out a solution.

I managed to find a clip that demonstrates the issue, keep your eyes on the right-hand side of the screen (on the blurred background image) when the skull pops up and you'll see what I mean. It's not too bad, but it's annoying and my renders would be cleaner without it.

I'm running Windows 10 on an Alienware X51 R3, 16GB RAM, i7-6700 CPU.

Comments

Kinvermark wrote on 8/18/2018, 4:34 PM

Do a forum search for best YouTube settings. Lots to read :) Low bit rates are not nice to footage with motion, fine detail, gradients, etc.

daniel-m7153 wrote on 8/18/2018, 4:38 PM

I've had my settings for years and they're great (some I can't change for work reasons, like frame rate), nothing else to complain about with my renders. Just this really odd specific issue that pops up from time to time :S

I do recall having this problem with a higher 14,000,000 bitrate though. Right now my bitrate is half that to save file space.

Kinvermark wrote on 8/18/2018, 4:48 PM

Is it only a YouTube problem or with footage played back locally on your PC, or TV, etc. ?

You could try a different render codec, or render to an intermediate like MagicYUV, then encode in Handbrake (best mp4 encoder - and free.)

fifonik wrote on 8/19/2018, 3:41 AM

If the issue exist on our mp4 renders that you created using Magix/Mainconcept AVC encoder, take a look at this topic

In short: these encoders sometimes produce such results and I think it is awful (Mainconcept AVC before Vegas 12 was better). The only workaround for now -- use other encoders.

daniel-m7153 wrote on 8/19/2018, 7:29 AM

It's a YouTube/local problem, but all videos are fine when viewed in Vegas preview. And I'm rendering with the Mainconcept AVC encoder, as fifonik specified. I guess I need to try some different encoders!

Here are the essential parameters for my renders (again, can't really change these for work reasons). If anyone has any suggestions I'm all ears.

Frame Rate: 25fps OR 60fps (depends on video topic). For 25fps videos, a bitrate around 4,000kbps. For 60fps, around 8,000 kbps. This is to save space on work's server.

1080p HD/MP4 for all videos.

Videos will be uploaded to YouTube only.

Kinvermark wrote on 8/19/2018, 9:32 AM

Those bitrates are low; you should expect some artifacts. Try Handbrake encode as suggested.

fifonik wrote on 8/19/2018, 4:42 PM

Bitrates you use are too low even for youtube recommendations

I would not use bitrate lower than 10 Mbps for 1080-25p. This will not fix the blocking issue mentioned in my topic, but would make it better. You can also try Sony AVC encoder (trade off -- blurrier image).