# nDVR problem (only sound,no videos)
**URL:** https://community.wowza.com/t/ndvr-problem-only-sound-no-videos/46459
**Category:** Wowza Streaming Engine
**Created:** [January 12, 2016, 2:10pm UTC](https://community.wowza.com/t/ndvr-problem-only-sound-no-videos/46459 "2016-01-12T14:10:05Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Passa\_Chaichalaw](https://community.wowza.com/u/Passa_Chaichalaw)
#### Post date: [January 12, 2016, 2:10pm UTC](https://community.wowza.com/t/ndvr-problem-only-sound-no-videos/46459/1 "2016-01-12T14:10:05Z")
Say Hi from Thailand
Wowza 4.3
Production level
We have run nDVR Stream running at that moment about 1month ago, In an append mode.
It has been a great working, but we do have some problem.
Problem is sometimes it has only sound, no videos.
How can we solve this problem?
Kind Regards
Passa C.
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### Author:  [@Daren\_Johnson](https://community.wowza.com/u/Daren_Johnson)
#### Post date: [January 15, 2016, 12:12am UTC](https://community.wowza.com/t/ndvr-problem-only-sound-no-videos/46459/2 "2016-01-15T00:12:54Z")
Hi,
There could be a few reason. Possibly A/V sync issues as nDVR is sensitive to these and if sync is too far out then chunks will be skipped.
You could look for ‘skip’ messages in the logs [install-dir]/logs/wowzastreamingengine\_access.log, that indicate such a problem.
Daren