# Is there bug with MP4 Recorder?

**URL:** https://community.wowza.com/t/is-there-bug-with-mp4-recorder/39619
**Category:** Wowza Streaming Engine
**Created:** [June 15, 2015, 1:49pm UTC](https://community.wowza.com/t/is-there-bug-with-mp4-recorder/39619 "2015-06-15T13:49:23Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![George\_Baker](https://avatars.discourse-cdn.com/v4/letter/g/96bed5/32.png) [@George\_Baker](https://community.wowza.com/u/George_Baker)
#### Post date: [June 15, 2015, 1:49pm UTC](https://community.wowza.com/t/is-there-bug-with-mp4-recorder/39619/1 "2015-06-15T13:49:23Z")

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I have posted another thread about this but haven’t got any success so far . I wanted to check if there is a legitimate bug with Audio Video Sync issues with recorded MP4 files . I have been trying to fix the issue for more than 2 weeks with no success . If it is a real bug in wowza I would rather not try to fix it on my side . I will really really appreciate any input from support here .

> [@Live Stream Recording Audio and Video Sync Issue](http://community.wowza.com/t/-/39618):
>
> I have seen this issue being posted many times without any resolution . We are using Wowza 4.1 . We are recording within wowza application using LiveStreamReecordManager . I am already using startOnKeyFrame with StreamRecordParameter . But Still there is no difference . Any parameters suggested for application.xml are not making any difference either . We are doing mp4 record only . This issue is causing us trouble as recorded OD files are pretty much useless. Please look in to this ASAP . Will…