videos on YouTube they are strongly pixelated a few seconds

[Francois Pénzes]

Hi Max

It would help if we had some more info. Are you running Windows, Mac or Ubuntu. What version ? What version of Vegas do you have ?

Cheers !

PC Win 10 Pro 64-bit 16gb Intel® Core™i7-2600k Quad Core 3.40GHz
Cameras: Canon XF305 + Canon XH-A1
Blackmagic HyperDeck Studio Mini
Vegas Pro 14, User since Vegas 3.0

\’\’When the cutting stops, the editing begins…\’\’

[John Rofrano]

It looks like a bitrate problem. The pixelation is right at the point where a lot of things are changing in the scene. The encoder is having a hard time because of the way inter-frame video is compressed. It is actually lossy meaning it will loose data to maintain the bit-rate it has been asked to use. There is a full frame (I-Frame) every so may frame (usually 15 frames but it’s adjustable) and the frames in between are predictive and delta frames (P & D-Frames) that contain only the changes since the last I-Frame. When a scene changes drastically on a delta or predictive frame, too much information is needed to represent the new image so the picture looks pixelated in those frames until either enough delta frames pass to reflect the change or an I-Frame is encountered which is a complete refresh of the image. Things like smoke, rain, or explosions cause enough change in the scene to make the encoder run out of bits and start pixelating. It’s not something under your control. Perhaps a better encoder would do a better job but perhaps not. Either way you are at the mercy of YouTube to encode it so you don’t get a choice. At some point it’s a physical impossibility to represent the image within a given bitrate because too much of the image is changing at the same time.

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com

[Max Webb]

Hi,

Thanks for you replies

For information: I use “Sony Vegas Pro 13” on “Windows 10” and after check i think my logiciel and his plug-ins are up to date.

After seen your reply John, I think also the problem come from the enconding and not from the sony Vegas rendering

[John Rofrano]

Yea, if you look at where it’s getting pixelated, it’s right after the trail of stars makes a circle which causes the entire frame to need an update and then your text is constantly moving which causes a fair amount of localized change which eventually clears up as it repeats the pattern of it’s movement but the background isn’t static either so you have 3 things going on at once that is driving the encoder crazy! lol ????

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com

[Francois Pénzes]

Hi Max

Yes, John has it right. The Youtube encoding is the culprit. There is however a workaround that sometimes works (don’t ask me why sometimes it does and sometimes it doesn’t, I have no clue)

Regardless of your project settings, try rendering the same video that you posted as if it was a 4K. Make sure that your render settings are at the max quality.

Making Youtube believe that it is a 4K file may just be the ticket in order to fool it.

Cheers…and Bonne Chance !

PC Win 10 Pro 64-bit 16gb Intel® Core™i7-2600k Quad Core 3.40GHz
Cameras: Canon XF305 + Canon XH-A1
Blackmagic HyperDeck Studio Mini
Vegas Pro 14, User since Vegas 3.0

\’\’When the cutting stops, the editing begins…\’\’

[Max Webb]

After that it still intrigues me, because on some render the video bug, while the relevant passages have no effect (there are fx on the video, but not on passages with bug)

Ex: At the beginning, and at ….
This pixelizes a lot while there is no effect.

https://www.youtube.com/watch?time_continue=6&v=sypQyq_lWq8

I think like you that the problem is related to YouTube, but it still intrigues me ^^^

PS : thank you Francois , I will try the rendering in 4k thank you;)

[Daniel Duvivier]

Hey, did you have any progress?

”This bug only appears in some qualities. Indeed in 1080p and in 360p it does not exist.”

Thats shocking because this is exact what happening with my video. It looked perfect after rendered, but when I upload it to Youtube (two days ago) it looked poor in 480p and less. There’s a lot of pixelated parts, also during transitions.
I tried a lot of things.

I dont know whats going on-getting desesperate already.

[Max Webb]

Hi Daniel, after some research and test it seams that the bug are less present when you make a 2K or a 4K but he still here.

[Max Webb]

Hi Daniel, after some research and test it seams that the bug are less present when you make a 2K or a 4K but he still here.

[Francois Pénzes]

Hi Max

If your video is going to be uploaded on Youtube try encoding your ”UHD” video at a bitrate of between 30 and 35Mbits. Beyond that, I think that what you’ll gain in detail is not apparent anymore.

I believe that Youtube will convert it to h265 (so that it will have a smaller file without loss of details). In general, Youtube caps video speed for UHD at 14Mbits in h265 (equivalent to 30Mbits in h264) . That’s why I think it’s useless to make your h264 video beyond 35Mbits .

A file with a high bitrate will have more information that will be useful for calibration. Bare in mind that if you know that you won’t need to colour correct in post, then you can shoot at a lower bit rate.

When you have a file with more information, your corrections on the video will suffer less. For example; if you increase the exposure when you have shadows, you will have less noise. Remember that you do not want to post-process a compressed file because the compression artifacts might throw off what you are trying to accomplish with the post-processing.

By the way, you have 2 choices to prepare for edit, either:

You colour correct and touch up all your videos, you render and with these renders you edit. I recommend this method if you have a lot of video (say more than 90 min. of video) or, you do all of your editing and once finished, before rendering, you calibrate your videos with the tools that are included with Vegas Pro or compatible plugins. Personally, I use the latter. Note that I do the calibration last (after editing) because playing pre-calibrated videos will make your computer sweat (unless you have a killer wizbang machine) .

Hope I haven’t bored you with to many details…

P.S.: If someone wants to add (or correct me) please fell free ! Even my wife says I’m not perfect….

Cheers !

PC Win 10 Pro 64-bit 16gb Intel® Core™i7-2600k Quad Core 3.40GHz
Cameras: Canon XF305 + Canon XH-A1
Blackmagic HyperDeck Studio Mini
Vegas Pro 14, User since Vegas 3.0

\’\’When the cutting stops, the editing begins…\’\’