Thank you for the link. I will try upload 4K contain from xavc s see how it goes. I might try MC .MP4 4K see Youtube will take it.

Just an update. MC .MP4 4k video 3840x2160 29.97P to Youtube working very nicely.

thanks Bruce, can you be even more specific i.e. what specific render template did you use? Did you change any options to customise the template? I also have a 4K camera Go Pro Hero 4 Black and keen to get the maximum quality uploaded YouTube will allow.

In Vegas Pro 12 or 13, you can create a custom 4K template from the Mainconcept AVC/AAC Internet HD 1080P as a starting point using custom Frame Size.

YouTube has a very larger file upload limit. Just choose an XAVC-I template that matches your media, and upload the resulting file. YouTube supports XAVC mainly because XAVC is just a higher profile of MP4/h.264/AVC. I say upload intra frame content that was produced at that level in the 1st place.

All the low bit rate people shooting in XAVC-S might be uploading footage that is below the bitrate supported by YouTube.

Here is a link to the YouTube upload specs that include 4K specs.

https://support.google.com/youtube/answer/1722171?hl=en

MattAdamson,

Here is the link for the screen shot. It is custom template under MainConcept encoder. I have not try XAVC template. But, MC.MP4 4K look so freaking good on Youtube. I am on Time Warner Cable 50Mbps internet connection and am able to watch 4K youtube video smoothly. my 6 cores CPU overclocked 4.5ghz were running 19-29 % cpu usage all the time while watching 4K video.

https://www.dropbox.com/s/ctj8yja57axtk2w/12-26-2015%201-33-44%20PM.png?dl=0

thanks all

1) Reviewing the YouTube specs it indicates 35-45 Mbps bit rate. I wonder how this equates to the render settings in Vegas e.g. the Variable Bit Rate option in Render As and the max and average you can set. I presume the max bit rate should be set to 45 in this case and the average?

2) astar you mention "Just choose an XAVC-I template that matches your media" so I presume this would be the best option. All "Sony XAVC" types appear when I click "Match project settings" i.e. XAVC Intra , XAVC Long and XAVC S Long. What do you mean by "I say upload intra frame content that was produced at that level in the 1st place." do you mean choose XAVC Intra here? However if I select the Sony XAVC template I don't have any option to set the max / average bit rate if I try and customise the template.

My rule of thumb for uploading is 2x the bitrate that YouTube streams at. So HD formats like XDCAM, and AVCHD are good to go as long as you are >20Mbs. For 4K content XAVC-I at >100Mbs would be a good choice for uploading to YouTube. Possibly even higher for 60P content, but YouTube maxes at 68Mbs currently for 4K-60P content.

What I mean by content produced at that level is referencing people shooting 4k into a 60mbs stream like XAVC-S, and then converting to XAVC-I which balloons the footage bit rate with not but not the picture quality. You should always try and acquire in XAVC-I or better (RAW, Prores, DNxHR.) Always start high with your image capture and work down to the display medium. If you go 1:1 image capture to YouTube's compression, you will not get as clean as results as letting YouTube toss extra information.

Thanks Astar

In relation to

XAVC-I at >100Mbs

I don't understand what you mean in relation to Sony Vegas. If you select any XAVC format intra or not there is no option to change the bit rate.

If I use the "Match project settings" option in Vegas for the Go Pro 4 files the following are displayed

1) XAVC Intra 29.97p
2) XAVC Long 29.97p
3) XAVC S Long 29.97p

Just to add more information for clarity. The media info reported for the original 4K Go Pro clip is as follows

ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L5.1
Format settings, CABAC : Yes
Format settings, ReFrames : 1 frame
Format settings, GOP : M=1, N=15
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 10s 377ms
Bit rate mode : Variable
Bit rate : 60.0 Mbps
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 (30000/1001) fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.241
Stream size : 74.3 MiB (100%)
Title : GoPro AVC
Language : English
Encoded date : UTC 2014-01-12 03:56:45
Tagged date : UTC 2014-01-12 03:56:45
Color range : Full
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709

If we then look at a rendered clip from Vegas in XAVC Intra we see

ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High 4:2:2 Intra@L5.1
Format settings, CABAC : No
Format settings, GOP : N=1
Format settings, wrapping mode : Frame
Codec ID : 0D01030102106001-0401020201323001
Duration : 14s 848ms
Bit rate : 274 Mbps
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate : 29.970 (30000/1001) fps
Standard : Component
Color space : YUV
Chroma subsampling : 4:2:2
Bit depth : 10 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 1.102
Stream size : 485 MiB (99%)
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709

then XAVC long

ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L5.1
Format settings, CABAC : Yes
Format settings, ReFrames : 2 frames
Format settings, GOP : M=3, N=15
Format settings, wrapping mode : Frame
Codec ID : 0D01030102106001-0401020201314001
Duration : 14s 848ms
Bit rate mode : Variable
Bit rate : 194 Mbps
Maximum bit rate : 188 Mbps
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate : 29.970 (30000/1001) fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.781
Stream size : 344 MiB (99%)
Transfer characteristics : BT.709

then XAVC S long

ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L5.1
Format settings, CABAC : Yes
Format settings, ReFrames : 2 frames
Format settings, GOP : M=3, N=16
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 14s 848ms
Bit rate : 114 Mbps
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 (30000/1001) fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.457
Stream size : 197 MiB (99%)
Language : English
Encoded date : UTC 2016-01-01 09:47:49
Tagged date : UTC 2016-01-01 09:47:49

A codec is like XAVC is more like HDCAM and XDCAM, even though technically it is just a higher profile of h.264/AVC. Like HDCAM and XDCAM the bitrate is not configurable, and will change bit rate based on the type of footage being feed to it. Feed it 4096x2160P@60fps with 10-bit color and bitrate will go way up. The only selections that need to be made are the video format you need.

XAVC-Intra will be your highest quality with 10-bit 4:2:2 color sampling for 2160-30P@ ~300MBs in an MXF container.

XAVC Long will be more highly compressed with 8-bit 4:2:0 color sampling for 2160-30P@~200Mbs in an MXF container.

XAVC S Long will be even more compressed with 8-bit 4:2:0 color sampling for 2160-30P@~100Mbs in an MP4 container.

Since the GoPro only shoots at about 60Mbs, I would try out your results with XAVC S Long 1st then see if you need anything better. The Intra frame recording of XAVC-I may edit smoother on the timeline, so do some tests. If you are seeing "..." after the frame counter that means you system is waiting on frames to be decoded.

A utility like "Media Info" will show you great details on the specifics of the formats.

I have 2x R9 290 in my system and both are utilized during render and preview. What Vegas doesn't support is Crossfire or SLI. You can force the driver to use it by enabling alternate frame rendering but it doesn't improve perfomance; it actually performs lower.
In fact, I tried a R9 290 with a GTX580. I used the R9 290 for General GPU acceleration and the GTX580 for MC AVC and Sony AVC with incredible render times. However, when rendering with plug ins like NeatVideo or BCC, the two R9 290 are better and that is the reason I took out the GTX580.