Category Archives: RTMP and video streaming

how to reduce HTTP Live Streaming (HLS) latency with Wowza Streaming Engine?

HTTP Live Streaming (HLS) is here to stay, it works everywhere, high quality and stability, but latency or delays between the stream and the end user can be 60-90 seconds, if you streaming live events that can be a very big issue, imagine Sports betting?
But with Wowza Streaming Engine it is possible to reduce the latency to 3 to 5 seconds.
It is not good enough but for now there is no other solution.

Below we have some adjustments that using the Wowza Streaming Engine Manage, we can easily improve, although of course there are some negative components.

This risks inherent of the configuration adjustements are due to smaller chunk sizes may result in playback errors if you fail to increase the number of seconds built into the playlist. If a stream is interrupted, and the player requests the next playlist, the stream may be interrupted when the playlist doesn’t arrive.

Additionally, by increasing the number of segments that are needed to create and deliver low-latency streams, you also increase the server cache requirements. To alleviate this concern, ensure that your server has a large enough cache, or built-in elasticity. You will also need to account for greater CPU and GPU utilization resulting from the increased number of keyframes. This requires careful planning for load balancing, with the understanding that increased computing and caching overhead incurs a higher cost of operation.

Lastly, as chunk sizes are smaller, the overall quality of the video playback can be impacted. This may result into either not being able to deliver full 4K video to the player, or small playback glitches with an increased risk of packet loss. Essentially, as you increase the number of bits (markers on the chunks), you require more processing power to provide smooth playback; without it, you get packet loss and interruptions.

A- In Wowza Streaming Engine Manager, click the Applications tab and then click live in the contents panel.

On the details page Properties tab, click Cupertino Streaming Packetizer in the Quick Links bar.

In the Cupertino Streaming Packetizer area, click Edit, and change the values for the following properties:

1- cupertinoChunkDurationTarget- Set the duration of each chunk in milliseconds. The default value is 10000, but the chunkDurationTarget must be smaller to reduce the latency of Apple HLS streams. For a one-second chunk size, set the value to 1000.

2- cupertinoMaxChunkCount- Sets the maximum number of chunks Wowza Streaming Engine stores in the available chunk list. The default value is 10, but for reduced latency streaming we recommend storing 50 seconds worth of chunks. For one-second chunks, set the cupertinoMaxChunkCount to 50; if you’re using half-second chunks, the value should be doubled (100).

3- cupertinoPlaylistChunkCount- Sets the number of items returned to the player in the playlist. The default value is 3, but for reduced latency streaming we recommend returning 12 seconds of data to the player. This prevents the loss of chunks between chunklist requests. For one-second chunks, set the cupertinoPlaylistChunkCount to 12; if you’re using half-second chunks, the value should be doubled (24).

ClickSave.

B- On the Properties tab, click Customin the Quick Links bar.

In the Custom area, click Edit.

Click Add Custom Property, specify the following custom property settings in the Add Custom Property dialog box, and then click Add:

1- In Path, select /Root/Application/LiveStreamPacketizer.

2- In Name, enter cupertinoMinPlaylistChunkCount.

3- In Type, select Integer.

4- In Value, specify the minimum number of chunks required before Wowza Streaming Engine provides a playlist to the player. The default value is 1, but for reduced latency streaming we recommend requiring a minimum of 6 seconds worth of chunks. For one-second chunks, set the cupertinoMinPlaylistChunkCount to 6; if you’re using half-second chunks, the value should be doubled (12).

Click Save and restart the application to apply the changes.

Done, try now. Or just contact Hosting Marketers and order our RTMP Wowza with our shared hosting Wowza Engine.

RTMP Servers

Real-Time Messaging Protocol or RTMP was developed originally by Macromedia, which then became Adobe. It was a system to implement streaming of video, text and audio over the internet between a flash player and a server with the RTMP setup.

Using fragments between the server and the user, it maintains a stable connection and because of that it has low latency, meaning that there is a very short delay, between the server and the user. The delay is perhaps 1 or 2 seconds.

The RTMP servers available are Adobe Media Server, Red5, Wowza Streaming Engine, Nginx RTMP server and a few more, but this 4 are the most common, although Adobe is very expensive and Red5 is difficult, personally I prefer Wowza RTMP, which has a number of advantages, we will talk about this on another post.

Going back to RTMP, it is a TCP-based protocol which maintains persistent stable connections and allows low-latency communication. To deliver streams smoothly and transmit as much information as possible, it splits streams into fragments, and their size is negotiated dynamically between the client and server.

RTMP servers are ideal for live streaming but also for Ondemand video streaming, it is also a necessary component for live video chats.

RTMP Server, how it works

The server must be setup with a media server, like Adobe or Red5, then the video stream connects to the RTMP installed on the server, the video stream could be a laptop with a software installed, this software is an encoder, there are a number of them, OBS Studio, but the most common is the Adobe, FMLE, which you can download free at http://hosting-marketers.com/flashmedialiveencoder_3.2_wwe_signed.msi (for windows computers, Mac computers you can download directly at Adobe site.)

On the encoder you enter the server RTMP, which would be something like this:

fmle encoder
click on the image to see larger size

rtmp://server_IP/live/stream_name

Then you connect and start the broadcast. this stream will go directly the RTMP server and you can now setup a player for your users, if you using a RTMP player you will need to use a flash player, but using Wowza Streaming Engine on the RTMP server it converts the stream to a HLS protocol which can be used on many other platforms as well, like smartphones and HTML5 Players. Although the HLS has the latency issue because of the flash players end of live it is nearly impossible not to use it. Nowadays, with a good configuration you can reduce the latency to 3 or 4 seconds.

So we have, YOU on your laptop with a camera and an encoder >>> your internet connection and the RTMP Server connection >>> and finally the player on your site broadcasting your live event. Or your video files.

Options while ordering wowza server

While ordering Wowza Streaming Engine on our billing system there are 4 options:

1- Live streaming, which as it says it is for live streaming or live broadcasts, perfect for broadcasting live events, sports, church events, weddings.

order wowza hosting

2- TV Station,  perfect for TV stations having the option to upload videos and create schedules and playlists schedule at a predetermined time.  At any time this schedule can be interrupted for live broadcasts.

3- Ondemand Streaming, with the option to upload videos and create playlists.

4- Live Camera Restream, used for IP cameras, the output of IP camera is normally RTSP or RTP ( example: rtsp://[camera-ip-address]:554/axis-media/media.amp ).

This format RTP or RTSP is useless for players, by using our wowza server and the Live Camera Re-Stream we convert this signal for playback on all supported player technologies. Some cameras are not supported, please open a ticket and email us the rtsp or rtp for us to check if it works on our wowza servers.

 

testing a red5 live streaming rtmp, plus creating a player for the rtmp

We created an app for live streaming here.

Now we going to test it and create a player code so we can start streaming to our site.

Do you have fmle installed on your computer? You need to download it from adobe.

Lets test it first, go to

http://209.95.39.220/test/

enter the rtmp of your app. the rtmp is

rtmp://server IP/app

so:

rtmp://RED5_SERVER_IP/live221

Enter this URL on the long string and click connect, now click “Publish” your camera will start,  and now click “Play” if the 2 players show the same thing you are on. Everything is good.

OK, now we have to work on “stream name”. We talked about rtmp, and we tested it, the testing site if you go back to it

http://209.95.39.220/test/

it has a stream name, “testing” this must be on both the publishing and on the player.

so it must be on the FMLE and on the player code.

fmle

(click on the image to have a better view)

the FMLE on the left you have your settings, frame per second, bitrate, your camera, format.

on the red5 server your bitrate should be about 320kbps higher then that you need a lot of RAM and server resources.

lets configure the fmle as the image shows.

on the right on the FMS URL enter the rtmp and on the stream enter your chosen stream name, in this case I entered “live” see image.

click connect, and then below click “Start”

you now streaming to your server.

 

Now creating a player for this stream. Go to

http://www.hosting-marketers.com/generator/

at the bottom on the “Streamer” enter the rtmp:

rtmp://RED5_SERVER_IP/live221

and on “Stream / File Name” enter the stream name, which we used on the FMLE, “live”

Click  “Generate Code!”

Take the “Preview & Embed” code, paste on your site and that’s it.

You can also use an image on the player, it will show before the user click to play,  enter the image URL on “Overlay Poster”

Red5 托管

Red5是一个类似于Adobe的Flash媒体服务器或者Wowza媒体服务器的媒体服务器。媒体服务器用于实况转播,视频聊天,会议直播,视频流,也被称为按需流。

使用媒体流服务器的主要好处是:

终端使用者(客户)的好处:

该服务器能够检测客户的连接速度并自动提供最佳视频流。Red5 托管

播放开始较早,用户可以跳至视频的任何部分,而不必等待整个文件下载。

提供者(站长)的好处:

广播直播活动的能力。

提供高级互动内容的能力,如直播聊天,视频会议等。

视频播放更有效率,需要较少的服务器资源和数据传输。

视频文件不是被下载到客户电脑,所以减少内容被盗取的机会。

详细的统计数据,诊断等
red5 托管

自2008年以来,Hosting Marketers就开始提供red5托管和wowza托管,我们拥有长期的经验而且我们的客户支持团队随时待命帮助您设置您的视频聊天或您的直播活动。

如果您需要更多信息,
请通过https://hosting-marketers.com/customers/submitticket.php?step=2&deptid=2 联系我们

或者直接通过http://hosting-marketers.com/ 下订单