What is the HLS protocol:
HLS (Http Live Streaming) is a protocol for real-time streaming defined by Apple. HLS is implemented based on the HTTP protocol. The transmission content includes two parts, one is the M3U8 description file, and the other is the TS media file.
HLS protocol application:
Since the transport layer protocol only requires the standard HTTP protocol, HLS can easily pass through firewalls or proxy servers, and can easily use CDN to accelerate distribution, which can easily solve the bottleneck of large-scale applications. And the client is easy to implement.
HLS is currently widely used in the field of on-demand and live broadcast. The HLS protocol transmits audio and video streams through the HTTP protocol to achieve live video. The realization of the HLS protocol is the key. In particular, the current live broadcast protocols of mobile phones in the live broadcast field basically use Apple's HLS protocol. It can be said that the emergence of this agreement has solved the problem of live broadcast on the mobile terminal.
Tools/Materials
800li media server
Method/Step
HLS protocol architecture diagram:
How to generate M3U8 file of HLS protocol
M3U8 file generation and analysis:
The main content of the HLS protocol is about the text protocol M3U8. In fact, the generation and analysis are very simple. The following are examples of practical applications:
Media Playlist (Media Playlist)
How to generate M3U8 file of HLS protocol
· HLS represents a media stream through a Playlist pointed to by URI (RFC3986).
· A Playlist can be a Media Playlist or Master Playlist, using a UTF-8 encoded text file, containing some URIs and descriptive tags.
· A Media Playlist contains a list of Media Segments. When played sequentially, the entire complete stream can be played.
· To play this Playlist, the client needs to download it first, and then play each Media Segment in it.
· A more complicated situation is that Playlist is a Master Playlist that contains a Variant Stream collection. Usually, each Variant Stream contains multiple different versions of the same stream (such as different resolutions and different bit rates).
HLS Media Segments
· Each Media Segment is specified by a URI and may contain a byte range.
· The duration of each Media Segment is specified by EXTINF tag.
· Each Media Segment has a unique integer Media Segment Number.
· Some media formats require a format-specific sequence to initialize a parser, before the Media Segment is parsed. This field is called Media Initialization Section, which is specified by EXT-X-MAP tag.
HLS delay problem
HLS theoretical delay = 1 slice duration + 0-1 td (td is EXT-X-TARGETDURATION, which can be simply understood as the interval time for the player to fetch slices) + 0-n startup slices (Apple's official recommendation is a request (Playing starts after 3 clips) + the network delay of the clip requested by the player (network connection time-consuming). In order to pursue a low-latency effect, the slices can be cut smaller, and the interval between fetching slices can be made smaller, and the player will start playing before three slices are fetched. However, these optimization methods will increase the risk of HLS instability and errors .
Nowadays, many streaming media live broadcast system manufacturers have used the HLS protocol to solve the playback problem of Android phones and Apple phones. Automatically generate the M3U8 playback link address of the effective live video, which is the M3U8 file of the HLS protocol for smooth playback on third-party players that support M3U8, such as VLC player or combined with HTML5 web technology to watch through the mobile browser web page Live video.
How to generate M3U8 file of HLS protocol
The sample playback code is as follows:
HTML code embedded in a web page
<script type="text/javascript" src="http://192.168.1.44:8083/assets/player.js"></script>
<script type="text/javascript">p2ps_embed("hls", "live", "http://192.168.1.44:8083/videos/live/22/39/tUabV17nAPCev", "p2ps_video", "640", "480", "10.1.0", "http://192.168.1.44:8083/assets/expressInstall.swf",{}, {allowFullScreen:true, allowScriptAccess: "always"});
</script><div id="p2ps_video"><h1>We need Flash player 10.1 or above to play. </h1><p><a href="http://www.adobe.com/go/getflashplayer"><img src="http://www.adobe.com/images/shared/download_buttons/get_flash_player. gif" alt="Install the latest Flash player" /></a></p>
</div>
Moble M3U8 link
http://192.168.1.44:8083/videos/live/22/39/tUabV17nAPCev/tUabV17nAPCev.M3U8
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How far(long) the transmitter cover?
The transmission range depends on many factors. The true distance is based on the antenna installing height , antenna gain, using environment like building and other obstructions , sensitivity of the receiver, antenna of the receiver . Installing antenna more high and using in the countryside , the distance will much more far.
EXAMPLE 5W FM Transmitter use in the city and hometown:
I have a USA customer use 5W fm transmitter with GP antenna in his hometown ,and he test it with a car, it cover 10km(6.21mile).
I test the 5W fm transmitter with GP antenna in my hometown ,it cover about 2km(1.24mile).
I test the 5W fm transmitter with GP antenna in Guangzhou city ,it cover about only 300meter(984ft).
Below are the approximate range of different power FM Transmitters. ( The range is diameter )
0.1W ~ 5W FM Transmitter ：100M ~1KM
5W ~15W FM Ttransmitter : 1KM ~ 3KM
15W ~ 80W FM Transmitter : 3KM ~10KM
80W ~500W FM Transmitter : 10KM ~30KM
500W ~1000W FM Transmitter : 30KM ~ 50KM
1KW ~ 2KW FM Transmitter : 50KM ~100KM
2KW ~5KW FM Transmitter : 100KM ~150KM
5KW ~10KW FM Transmitter : 150KM ~200KM
How to contact us for the transmitter?
Call me +8618078869184 OR
Email me [email protected]
1.How far you want to cover in diameter ?
2.How tall of you tower ?
3.Where are you from ?
And we will give you more professional advice.
About Us
FMUSER.ORG is a system integration company focusing on RF wireless transmission / studio video audio equipment / streaming and data processing .We are providing everything from advice and consultancy through rack integration to installation, commissioning and training.
We offer FM Transmitter, Analog TV Transmitter, Digital TV transmitter, VHF UHF Transmitter, Antennas, Coaxial Cable Connectors, STL, On Air Processing, Broadcast Products for the Studio, RF Signal Monitoring, RDS Encoders, Audio Processors and Remote Site Control Units, IPTV Products, Video / Audio Encoder / Decoder, designed to meet the needs of both large international broadcast networks and small private stations alike.
Our solution has FM Radio Station / Analog TV Station / Digital TV Station / Audio Video Studio Equipment / Studio Transmitter Link / Transmitter Telemetry System / Hotel TV System / IPTV Live Broadcasting / Streaming Live Broadcast / Video Conference / CATV Broadcasting system.
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We have customers of public and commercial broadcasters, telecom operators and regulation authorities , and we also offer solution and products to many hundreds of smaller, local and community broadcasters .
FMUSER.ORG has been exporting more than 15 years and have clients all over the world. With 13 years experience in this field ,we have a professional team to solve customer's all kinds of problems. We dedicated in supplying the extremely reasonable pricing of professional products & services. Contact email : [email protected]
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For Warranty .
Contact US--->>Return the item to us--->>Receive and send another replace .
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