# Value of EXT-X-TARGETDURATION is not changed **URL:** \ **Category:** Wowza Streaming Engine\ **Created:** [April 24, 2018, 2:38pm UTC](https://community.wowza.com/t/value-of-ext-x-targetduration-is-not-changed/51194 "2018-04-24T14:38:09Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![noriaki\_hangyo](https://avatars.discourse-cdn.com/v4/letter/n/9fc29f/32.png) [@noriaki\_hangyo](https://community.wowza.com/u/noriaki_hangyo)\ **Post date:** [April 24, 2018, 2:38pm UTC](https://community.wowza.com/t/value-of-ext-x-targetduration-is-not-changed/51194/1 "2018-04-24T14:38:09Z")
i used wowza 4.7.5 free trial. EXT-X-TARGET DURATION and EXTINF are not set as intended. I made the following settings at wowza. cupertinoChunkDurationTarget: 5000 cupertinoMaxChunkCount: 10 cupertinoPlaylistChunkCount: 2 The contents of the m3u8 file are now below. #EXTM3U #EXT-X-VERSION:3 #EXT-X-TARGETDURATION:9 #EXT-X-MEDIA-SEQUENCE:13 #EXTINF:8.333, media\_w1176501573\_13.ts #EXTINF:8.333, media\_w1176501573\_15.ts I changed the value of cupertinoChunkDurationTarget from 5000 to 4000 or 3000, but EXT-X-TARGETDURATION remained 9 all the time. I want to set the ts file size to 5, but it will not be changed. How can I change it? ---
**Author:** ![Karel\_Boek](https://sea2.discourse-cdn.com/flex002/user_avatar/community.wowza.com/karel_boek/32/454_2.png) [@Karel\_Boek](https://community.wowza.com/u/Karel_Boek)\ **Post date:** [April 25, 2018, 6:33am UTC](https://community.wowza.com/t/value-of-ext-x-targetduration-is-not-changed/51194/2 "2018-04-25T06:33:47Z")
@noriaki hangyo, check the key frame interval (a.k.a GOP size) of your source. HLS chunks must always start with a key frame, and thus the smallest chunk size is the same as the key frame interval. If that’s a larger number than your cupertinoChunkDurationTarget setting, then Wowza will automatically adjust.