# Keyframe alignment problem with Wowza and FFMPEG

**URL:** <https://community.wowza.com/t/keyframe-alignment-problem-with-wowza-and-ffmpeg/39715>\
**Category:** Wowza Streaming Engine\
**Created:** [December 28, 2014, 12:19pm UTC](https://community.wowza.com/t/keyframe-alignment-problem-with-wowza-and-ffmpeg/39715 "2014-12-28T12:19:31Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Andrew\_Kennedy1](https://avatars.discourse-cdn.com/v4/letter/a/278dde/32.png) [@Andrew\_Kennedy1](https://community.wowza.com/u/Andrew_Kennedy1)\
**Post date:** [December 28, 2014, 1:16am UTC](https://community.wowza.com/t/keyframe-alignment-problem-with-wowza-and-ffmpeg/39715/2 "2014-12-28T01:16:54Z")

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Hi,

The issue you may be experiencing is that unless 2 pass encoding is used the output from each encode will not be aligned to each other.

Please see this article

[Frequently-requested-FFMPEG-command-examples-for-Wowza](http://community.wowza.com/t/-/36326)

Specifically the example at

1. Generate keyframe aligned multi-bitrate VOD rendition (Linux)

Andrew

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