# Cupertino Streaming: Lowest possible cupertinoChunkDurationTarget

**URL:** <https://community.wowza.com/t/cupertino-streaming-lowest-possible-cupertinochunkdurationtarget/36209>\
**Category:** Wowza Streaming Engine\
**Created:** [March 3, 2011, 10:30am UTC](https://community.wowza.com/t/cupertino-streaming-lowest-possible-cupertinochunkdurationtarget/36209 "2011-03-03T10:30:20Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Jaganath\_Achari](https://avatars.discourse-cdn.com/v4/letter/j/6f9a4e/32.png) [@Jaganath\_Achari](https://community.wowza.com/u/Jaganath_Achari)\
**Post date:** [March 3, 2011, 10:30am UTC](https://community.wowza.com/t/cupertino-streaming-lowest-possible-cupertinochunkdurationtarget/36209/1 "2011-03-03T10:30:20Z")

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I am trying to reduce the latency of Cupertino Streaming as much low as possible. I have observed that any value less than 500 ms for _cupertinoChunkDurationTarget_ results in failure to stream with a error message of

“\*\*\*\*\*\*\*\*\*\*\* Why is chunk not open” on the console.

Has anyone achieved a smaller chunk duration for Cupertino Streaming or is this the lowest I can go?

Thanks in advance.

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**Author:** ![Charlie\_Good](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/charlie_good/32/383_2.png) [@Charlie\_Good](https://community.wowza.com/u/Charlie_Good)\
**Post date:** [March 2, 2011, 10:06pm UTC](https://community.wowza.com/t/cupertino-streaming-lowest-possible-cupertinochunkdurationtarget/36209/2 "2011-03-02T22:06:22Z")

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Be sure the key frame interval is as low as the chunk size. Also add the following property to the settings:

```auto
<Property>
	<Name>chunkDurationTolerance</Name>
	<Value>150</Value>
	<Type>Integer</Type>
</Property>

```

Charlie

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**Author:** ![Richard\_Lanham](https://avatars.discourse-cdn.com/v4/letter/r/c68b51/32.png) [@Richard\_Lanham](https://community.wowza.com/u/Richard_Lanham)\
**Post date:** [March 4, 2011, 3:12pm UTC](https://community.wowza.com/t/cupertino-streaming-lowest-possible-cupertinochunkdurationtarget/36209/3 "2011-03-04T15:12:28Z")

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Richard,

The guide for that is here:

[https://www.wowza.com/docs/how-to-configure-apple-hls-packetization-cupertinostreaming](https://www.wowza.com/docs/how-to-configure-apple-hls-packetization-cupertinostreaming))

Richard

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**Author:** ![Richard\_Bailey](https://avatars.discourse-cdn.com/v4/letter/r/7ab992/32.png) [@Richard\_Bailey](https://community.wowza.com/u/Richard_Bailey)\
**Post date:** [March 4, 2011, 7:06am UTC](https://community.wowza.com/t/cupertino-streaming-lowest-possible-cupertinochunkdurationtarget/36209/4 "2011-03-04T07:06:24Z")

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How low did ppl manage to get the delay?

FYI we are testing with Haivision Makitos which are low delay on the input.