# Adaptive bitrate streaming with Stream Name issue

**URL:** <https://community.wowza.com/t/adaptive-bitrate-streaming-with-stream-name-issue/48062>\
**Category:** Wowza Streaming Engine\
**Created:** [January 23, 2017, 12:06pm UTC](https://community.wowza.com/t/adaptive-bitrate-streaming-with-stream-name-issue/48062 "2017-01-23T12:06:14Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Gregory\_Debord](https://avatars.discourse-cdn.com/v4/letter/g/46a35a/32.png) [@Gregory\_Debord](https://community.wowza.com/u/Gregory_Debord)\
**Post date:** [January 23, 2017, 12:06pm UTC](https://community.wowza.com/t/adaptive-bitrate-streaming-with-stream-name-issue/48062/1 "2017-01-23T12:06:14Z")

</div>

Hello,

I’m trying to perform Adaptive bitrate streaming with Stream Name Groups (HLS) with url like http://[wowza-ip-address]:1935/app/ngrp:myStream\_all/playlist.m3u8

In the Wowza streaming engine manager, in my application \> Incoming streams, I can see the incoming stream :

![](http://163.172.82.244/stream.png)

In transrate.xml, StreamNameGroups are defined as follow :

```auto
                <StreamNameGroups>
			<!-- Note: Play stream using stream name ngrp:[stream-name] -->
			<StreamNameGroup>
				<Name>all</Name>
				<StreamName>${SourceStreamName}_all</StreamName>
				<Members>
					<Member>
						<MemberName>720p</MemberName>
						<EncodeName>720p</EncodeName>
						<MediaListRendition>
							<WowzaVideoOnly>false</WowzaVideoOnly>
							<WowzaAudioOnly>false</WowzaAudioOnly>
						</MediaListRendition>
					</Member>
					<Member>
						<MemberName>360p</MemberName>
						<EncodeName>360p</EncodeName>
						<MediaListRendition>
							<WowzaVideoOnly>false</WowzaVideoOnly>
							<WowzaAudioOnly>false</WowzaAudioOnly>
						</MediaListRendition>
					</Member>
				</Members>
				<Description></Description>
			</StreamNameGroup>
			<StreamNameGroup>
				<Name>mobile</Name>
				<StreamName>${SourceStreamName}_mobile</StreamName>
				<Members>
					<Member>
						<MemberName>240p</MemberName>
						<EncodeName>240p</EncodeName>
					</Member>
					<Member>
						<MemberName>160p</MemberName>
						<EncodeName>160p</EncodeName>
					</Member>
				</Members>
			</StreamNameGroup>
		</StreamNameGroups>

```

And in Application.xml, Streams are defined as follow

```auto
               <Streams>
			<!--StreamType>default</StreamType-->
			<StreamType>live</StreamType>
			<StorageDir>${com.wowza.wms.context.VHostConfigHome}/content/w/${com.wowza.wms.context.ApplicationInstance}</StorageDir>
			<KeyDir>${com.wowza.wms.context.VHostConfigHome}/keys</KeyDir>
			<!-- LiveStreamPacketizers (separate with commas): cupertinostreamingpacketizer, smoothstreamingpacketizer, sanjosestreamingpacketizer, mpegdashstreamingpacketizer, cupertinostreamingrepeater, smoothstreamingrepeater, sanjosestreamingrepeater, mpegdashstreamingrepeater, dvrstreamingpacketizer, dvrstreamingrepeater -->
			<LiveStreamPacketizers>cupertinostreamingpacketizer, smoothstreamingpacketizer, sanjosestreamingpacketizer</LiveStreamPacketizers>
			<!-- Properties defined here will override any properties defined in conf/Streams.xml for any streams types loaded by this application -->
			<Properties>
				<Property>
					<Name>versionFile</Name>
					<Value>false</Value>
					<Type>Boolean</Type>
				</Property>
				<Property>
					<Name>appendFile</Name>
					<Value>true</Value>
					<Type>Boolean</Type>
				</Property>
			</Properties>
		</Streams>

```

when I try to retrieve the m3u8, strange things happen:

wget [http://wowza-ip/app/17983/ngrp:stream\_all/playlist.m3u8](http://wowza-ip/app/17983/ngrp:stream_all/playlist.m3u8) =\> returns a 404

whereas

wget [http://wowza-ip/app/17983/ngrp:stream\_720p/playlist.m3u8](http://wowza-ip/app/17983/ngrp:stream_720p/playlist.m3u8) gives

```auto
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-STREAM-INF:BANDWIDTH=1126731,CODECS="avc1.100.31,mp4a.40.2",RESOLUTION=960x540
chunklist_w1590244362.m3u8

```

and wget [http://wowza-ip/myapp/17983/ngrp:whatever/playlist.m3u8](http://wowza-ip/myapp/17983/ngrp:whatever/playlist.m3u8) gives

```auto
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-STREAM-INF:BANDWIDTH=1126731,CODECS="avc1.100.31,mp4a.40.2",RESOLUTION=960x540
chunklist_w505244174.m3u8

```

So I can’t really figure out the logic behind this, any help would be greatly appreciated.

Thank you.

---

<div class="post-metadata">

**Author:** ![Gregory\_Debord](https://avatars.discourse-cdn.com/v4/letter/g/46a35a/32.png) [@Gregory\_Debord](https://community.wowza.com/u/Gregory_Debord)\
**Post date:** [January 24, 2017, 5:21am UTC](https://community.wowza.com/t/adaptive-bitrate-streaming-with-stream-name-issue/48062/2 "2017-01-24T05:21:42Z")

</div>

Very strange, after doing some more tests, here is what I observed :

Depending on the input stream (delivered by the same encoder (OBS) with same configuration), [http://wowza-ip/app/xxxxx/ngrp:stream\_all/playlist.m3u8](http://wowza-ip/app/xxxxx/ngrp:stream_all/playlist.m3u8) sometimes returns a 404 and sometimes returns a working adaptative bitrate HLS stream…

Could this have to do with network availability or something like this ? Are there any “Cupertino Streaming Packetizer” properties to modify to avoid this ?

Thank you for your help.