In Broadcast - January 2021 - 32

32

www.inbroadcast.com | Vol: 11 - Issue 1 | January 2021

InTech
Introduction
YouTube recently announced support for HDR
content.
The Cobalt 9992-ENC is capable of
transmitting live HDR content to YouTube, both in HD
and 4K resolutions. While HDR is available for both
H.264 (AVC) and H.265 (HEVC), YouTube elected to
support it only for HEVC. In order to stream live HDR
to YouTube, you need the following:
1.	 A 9992-ENC with appropriate licensing to work 	
		 in HEVC mode. This can be:
a.	 Model 9992-ENC-4K-HEVC or
b.	 Model 9992-ENC with the optional
		 +HEVC license.
2.	 An HDR video source in PQ10 format. If you
have an HDR source in some other format, or if you
have an SDR source that want to convert to HDR (by
using inverse tone mapping), you can use the Cobalt
9904-UDX-4K with the SDR/HDR Conversion Options
(+HDR-TCHCLR-4K, +HDR-TCHCLR).
3.	 A YouTube account enabled for live streaming.

YouTube Configuration
Prior to starting the encoder, you need to create a
live broadcast at YouTube. Go to your channel, click
on the indicated icon at the top of the page, and
select Go Live:

How to Stream HDR
Content to YouTube Using
the Cobalt 9992-ENC
Encoder Video Configuration
HDR operation requires 10-bit encoding mode. This
is selected in the encoder Basic tab, under Video
Parameters:

Encoder Output Configuration

YouTube requires appropriate video signal
metadata.
This can be done in the encoder
Advanced tab. When you check the Enable Video
Signal Type box, the other parameters will become
available. Here are the appropriate settings:

Since HEVC is not supported by RTMP, the stream
has to be supplied to YouTube as an HLS stream. The
standard way to send HLS streams to a remote server
is through HTTP Push.
These selections are made in the encoder Output
tab, illustrated below:

Once you select this, the following page opens:
However, make sure that the Color Primaries
match the actual signal.

Encoder Quality Optimization
These settings are not required for interoperation
with YouTube, but are recommended to get the best
quality out of your 9992-ENC. They are found in the
encoder Advanced tab and are illustrated below.
The most important part is the Stream Key, which
is required for the 9992-ENC configuration. Also
note that the Stream URL part is not used - we will
be streaming HEVC content, which is not supported
by RTMP. The streaming will be through HLS, and the
URL is different.

9992-ENC Configuration
While the 9992-ENC supports HDR for both AVC and
HEVC, YouTube only supports it for HEVC. Therefore,
the first step is to configure the 9992-ENC for HEVC
support. This is done in the Encoder Mode tab, as
shown below.

The other settings in this tab can be chosen to suit
your needs.

The steps are:
1.	 In the Output tab, select HLS in the Output
Protocol drop down (step 1 above).
2.	For Server Location, select Remote
		 (step 2 above).
3.	For Transfer Protocol, select HTTP/S
		 (step 3 above).
4.	 In the Upload URL field, enter the following:
https://a.upload.youtube.com/http_upload_
hls?cid=xxxx-xxxx-xxxx-xxxx-xxxx©=0&file=
Replace xxxx-xxxx-xxxx-xxxx-xxxx with your
YouTube stream key, which you obtained from
the YouTube web site (see YouTube Configuration
above).
5.	 Leave the Enable Host Header box unchecked.
The Base File Name field can also be left at the
default value of " live " (YouTube does not care what
this is, but a value must be supplied).
6.	Choose a suitable segment duration (in the
Segment (sec) field). YouTube prefers a value
between 2 and 4 seconds. Larger values are more
robust to varying network conditions.
7.	 Any of the choices for the Number of Segments
will work. YouTube prefers 5.
8.	 YouTube does not use the Program Name. This
field can be left untouched.
Once you have all of this configured, start the
encoder. Note that it may take YouTube up to 30
seconds to start showing the video.


http://www.inbroadcast.com https://www.cobaltdigital.com/products/4864/9992-enc https://www.cobaltdigital.com/products/4864/9992-enc https://www.cobaltdigital.com/products/4864/9992-enc https://www.cobaltdigital.com/products/4864/9992-enc https://www.cobaltdigital.com/products/4864/9992-enc https://www.cobaltdigital.com/products/4864/9992-enc https://www.cobaltdigital.com/products/4864/9992-enc https://www.cobaltdigital.com/products/4864/9992-enc https://a.upload.youtube.com/http_upload_ https://www.cobaltdigital.com/products/4864/9992-enc

In Broadcast - January 2021

Table of Contents for the Digital Edition of In Broadcast - January 2021

Contents
In Broadcast - January 2021 - Intro
In Broadcast - January 2021 - Cover1
In Broadcast - January 2021 - Cover2
In Broadcast - January 2021 - Contents
In Broadcast - January 2021 - 4
In Broadcast - January 2021 - 5
In Broadcast - January 2021 - 6
In Broadcast - January 2021 - 7
In Broadcast - January 2021 - 8
In Broadcast - January 2021 - 9
In Broadcast - January 2021 - 10
In Broadcast - January 2021 - 11
In Broadcast - January 2021 - 12
In Broadcast - January 2021 - 13
In Broadcast - January 2021 - 14
In Broadcast - January 2021 - 15
In Broadcast - January 2021 - 16
In Broadcast - January 2021 - 17
In Broadcast - January 2021 - 18
In Broadcast - January 2021 - 19
In Broadcast - January 2021 - 20
In Broadcast - January 2021 - 21
In Broadcast - January 2021 - 22
In Broadcast - January 2021 - 23
In Broadcast - January 2021 - 24
In Broadcast - January 2021 - 25
In Broadcast - January 2021 - 26
In Broadcast - January 2021 - 27
In Broadcast - January 2021 - 28
In Broadcast - January 2021 - 29
In Broadcast - January 2021 - 30
In Broadcast - January 2021 - 31
In Broadcast - January 2021 - 32
In Broadcast - January 2021 - 33
In Broadcast - January 2021 - 34
In Broadcast - January 2021 - 35
In Broadcast - January 2021 - 36
In Broadcast - January 2021 - 37
In Broadcast - January 2021 - 38
In Broadcast - January 2021 - 39
In Broadcast - January 2021 - 40
In Broadcast - January 2021 - 41
In Broadcast - January 2021 - 42
In Broadcast - January 2021 - 43
In Broadcast - January 2021 - 44
In Broadcast - January 2021 - 45
In Broadcast - January 2021 - 46
In Broadcast - January 2021 - 47
In Broadcast - January 2021 - 48
In Broadcast - January 2021 - 49
In Broadcast - January 2021 - 50
In Broadcast - January 2021 - 51
In Broadcast - January 2021 - 52
In Broadcast - January 2021 - 53
In Broadcast - January 2021 - 54
In Broadcast - January 2021 - 55
In Broadcast - January 2021 - Cover3
In Broadcast - January 2021 - Cover4
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