logo

Live Production Software Forums

www.vmix.com

Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error
Audio hicks / jitter
Options
Go to last post Go to first unread
Previous Topic Next Topic
Alfredvdh  
#1 Posted : Sunday, February 23, 2014 5:10:54 PM(UTC)
Alfredvdh

Rank: Member

Groups: Registered
Joined: 11/7/2013(UTC)
Posts: 15

Thanks: 1 times
Was thanked: 1 time(s) in 1 post(s)
Hello everyone,

I'm new at this forum, but a enthusiastic user of Vmix.
Now i've an issue with the audio.

When playing audio trough Vmix, it gives a hick up or a jitter.
This happens sometimes in the audio. Today i've been testing different things.
My conclusion is that when i'm opening Vmix and let the audio play trough vmix i'v got te hicks.

When i'm playing the audio trough the audiocard -with vmix closed- there is no problem.
Also i've installed another version of vmix (10), but there also the same problem. Also happening in both versions: x64 and normal.

Besides that, when i'm starting the recording or streaming, it happens more.
But also without any processor insensitive proces it happens.

My system:
i7 2600K 3.4GHZ
8 GB Memory
NVidia 7950GT
M-Audio 2496

I placed a video on youtube where you can listen at this (just play a few minutes somewhere to recognize)


Below the settings i've used from the recording file.
I'll hope that anyone can help me with this issue.


Logfile:
17-2-2014 19:27:39, Version: 11.0.0.66
17-2-2014 19:27:39, Size: 1280x720
17-2-2014 19:27:39, System: PAL 50p
17-2-2014 19:27:39, Codec: H264
17-2-2014 19:27:39, Format: RGB32 32 22
17-2-2014 19:27:39, AudioDevice: vMix Audio
17-2-2014 19:27:39, AudioFormat: 48000 Hz 16 Bit 2 Channels
17-2-2014 19:27:39, AudioDelay: 0
17-2-2014 19:27:39, RestartInterval: 0
17-2-2014 19:27:39, BitRate: 75
17-2-2014 20:37:33, StartRecording
17-2-2014 21:47:48, StopRecording
17-2-2014 21:47:48, Duration: 01:10:15
17-2-2014 21:47:48, Frames: 105364
17-2-2014 21:47:48, DroppedFrames: 105381
17-2-2014 21:47:48, DueToSourceFrameRate: 105381
17-2-2014 21:47:48, DueToHardDiskOrCPU: 0
17-2-2014 21:47:48, DroppedSamples: 1
17-2-2014 21:47:48, MissedSamples: 0
17-2-2014 21:47:48, SyncedSamples: 0
17-2-2014 21:47:48, AudioOffset: 0
17-2-2014 21:47:48, AudioDelay: 0
17-2-2014 21:47:48, AudioEngine
17-2-2014 21:47:48, Running: True
17-2-2014 21:47:48, SampleRate: 48000hz 16 Bit
17-2-2014 21:47:48, MixingErrors: 0
17-2-2014 21:47:48, Streams
17-2-2014 21:47:48, Stream0
17-2-2014 21:47:48, Samples: 474417
17-2-2014 21:47:48, Dropped: 0
17-2-2014 21:47:48, Latency: 1
17-2-2014 21:47:48, Stream1
17-2-2014 21:47:48, Samples: 0
17-2-2014 21:47:48, Dropped: 0
17-2-2014 21:47:48, Latency: 0
17-2-2014 21:47:48, AudioInputs
17-2-2014 21:47:48, Decklink Video Capture (4)
17-2-2014 21:47:48, Latency: 90/80
17-2-2014 21:47:48, Dropped: 0
17-2-2014 21:47:48, Resampled: 6810 ms
17-2-2014 21:47:48, Decklink Video Capture (5)
17-2-2014 21:47:48, Latency: 100/80
17-2-2014 21:47:48, Dropped: 0
17-2-2014 21:47:48, Resampled: 6840 ms
17-2-2014 21:47:48, Decklink Video Capture
17-2-2014 21:47:48, Latency: 100/80
17-2-2014 21:47:48, Dropped: 0
17-2-2014 21:47:48, Resampled: 7130 ms
Back to top

Wanna join the discussion?! Login to your vMix Forums forum account, or Register a new forum account.
Back to top  
admin  
#2 Posted : Sunday, February 23, 2014 11:17:48 PM(UTC)
admin

Rank: Administration

Groups: Administrators
Joined: 1/13/2010(UTC)
Posts: 5,228
Man
Location: Gold Coast, Australia

Was thanked: 4332 time(s) in 1528 post(s)
Hi,

Do you know why the video format has been set to RGB32? That would cause a definite reduction in performance.
Change it to UYVY again in vMix Settings under the Performance tab.

Also, your CPU may not be capable of recording to H264 at 50fps, so try recording at 25fps instead.

Regards,

Martin
vMix
Back to top
WWW BLOG
Alfredvdh  
#3 Posted : Monday, February 24, 2014 9:30:12 AM(UTC)
Alfredvdh

Rank: Member

Groups: Registered
Joined: 11/7/2013(UTC)
Posts: 15

Thanks: 1 times
Was thanked: 1 time(s) in 1 post(s)
Hello Martin,

Thank you for your reaction.
When changing it to UYVY the audio doesn't get better. I just choose RBG32 because the other options gives a green line at the left of the player (see image).
The green line comes in at the internal output (for live streaming) as output to an external card. I have read about this green line that all the settings must be the same.
In my opinion everything is the same, 720p, 1280x720 resolution.

Recording i have changed. but the sound has also hick without recording.
So, at this moment, changing the Output Format, didn't help.

Remarkable are the dropped frames of 105381. I don't now what it means, but i have another recording, without the audio hicks and that one has 57 dropped frames.
All other settings are the same.

Have you other suggestions?


Regards,

Alfred


UserPostedImage
Back to top
admin  
#4 Posted : Monday, February 24, 2014 9:36:33 AM(UTC)
admin

Rank: Administration

Groups: Administrators
Joined: 1/13/2010(UTC)
Posts: 5,228
Man
Location: Gold Coast, Australia

Was thanked: 4332 time(s) in 1528 post(s)
Hi,

I've just noticed the graphics card you are using is very old and will likely need to be upgraded.
You can tell if the problem is the graphics card by looking at the Render Time in vMix. If this is over 20ms you will
need to upgrade.

The green bar is likely caused by the graphics card too.

Regards,

Martin
vMix
Back to top
WWW BLOG
thanks 1 user thanked admin for this useful post.
Alfredvdh on 2/24/2014(UTC)
Alfredvdh  
#5 Posted : Monday, February 24, 2014 9:48:47 AM(UTC)
Alfredvdh

Rank: Member

Groups: Registered
Joined: 11/7/2013(UTC)
Posts: 15

Thanks: 1 times
Was thanked: 1 time(s) in 1 post(s)
Hello Martin,

Thank you for your reaction.
When the hickup start, the render time is about 17ms, sometimes less, sometimes more.
Normally operating it is at 6,7 ms, sometimes higher. Just see 28ms at an hickup.

Is there an videocard you can recommend (one pci slot? )

Alfred
Back to top
Alfredvdh  
#6 Posted : Tuesday, February 25, 2014 5:51:34 PM(UTC)
Alfredvdh

Rank: Member

Groups: Registered
Joined: 11/7/2013(UTC)
Posts: 15

Thanks: 1 times
Was thanked: 1 time(s) in 1 post(s)
Hi Martin,

Thank you very much for your advice.
I replaced the GT7950 and installed now a Geforce GT 630 1GB, Single Slot.

I don't have the audio hicks/jitter and the green line is also gone.
With the GT7950 i had also issues with audio delay (about 2-4 frames), that issue is now also gone!

Again, thank you very much.

Alfred
Back to top
Users browsing this topic
Guest (2)
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Privacy Policy | Powered by YAF.NET | YAF.NET © 2003-2024, Yet Another Forum.NET
This page was generated in 0.146 seconds.