# HLS EXT-X-I-FRAMES-ONLY support

**URL:** <https://community.wowza.com/t/hls-ext-x-i-frames-only-support/35662>\
**Category:** Wowza Streaming Engine\
**Created:** [March 22, 2012, 6:45pm UTC](https://community.wowza.com/t/hls-ext-x-i-frames-only-support/35662 "2012-03-22T18:45:11Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Greg\_K](https://avatars.discourse-cdn.com/v4/letter/g/ecccb3/32.png) [@Greg\_K](https://community.wowza.com/u/Greg_K)\
**Post date:** [March 22, 2012, 6:45pm UTC](https://community.wowza.com/t/hls-ext-x-i-frames-only-support/35662/1 "2012-03-22T18:45:11Z")

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Hello,

We are trying to implement fast-forward/slow-motion support for VOD content using HTTP Live Streaming on iOS. According to [https://tools.ietf.org/html/draft-pantos-http-live-streaming-07#page-14](https://tools.ietf.org/html/draft-pantos-http-live-streaming-07#page-14), iOS devices can implement efficient fast-forward by using I-Frames (using EXT-X-I-FRAMES-ONLY tags).

I am guessing this is currently not supported (please correct me if I am wrong), but I would like to know if this on the road map at all.

Thank you

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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 23, 2012, 10:20am UTC](https://community.wowza.com/t/hls-ext-x-i-frames-only-support/35662/2 "2012-03-23T10:20:35Z")

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You’re right, it is not support at present. Only flv containing Spark or VP6 video and NellyMoser audio with a Flash RTMP client is supported for trick play.

Richard

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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 23, 2012, 12:59pm UTC](https://community.wowza.com/t/hls-ext-x-i-frames-only-support/35662/3 "2012-03-23T12:59:07Z")

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It is a possible future feature, but I do not have a time frame for that.

Richard

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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:** [October 9, 2012, 10:32pm UTC](https://community.wowza.com/t/hls-ext-x-i-frames-only-support/35662/4 "2012-10-09T22:32:31Z")

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Not that I have heard.

Richard

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**Author:** ![Joe\_Xander\_Romero](https://avatars.discourse-cdn.com/v4/letter/j/dfb087/32.png) [@Joe\_Xander\_Romero](https://community.wowza.com/u/Joe_Xander_Romero)\
**Post date:** [October 9, 2012, 2:22pm UTC](https://community.wowza.com/t/hls-ext-x-i-frames-only-support/35662/5 "2012-10-09T14:22:18Z")

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Any news on I-FRAMES-ONLY playlists?

–Joe.