logo

Live Production Software Forums

www.vmix.com

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

Notification

Icon
Error
Split File Recording: Frame Drops between files
Options
Go to last post Go to first unread
Previous Topic Next Topic
robertskiba  
#1 Posted : Wednesday, February 14, 2024 7:20:08 PM(UTC)
robertskiba

Rank: Advanced Member

Groups: Registered
Joined: 8/22/2021(UTC)
Posts: 34
Man
Germany

Thanks: 3 times
Was thanked: 4 time(s) in 4 post(s)
Hi guys,

I still have a problem with vmix that makes it unusable if you do recordings with the split files option. This bug is still active since ever. This is what I did:

1. Setup vmix to play a simple test video file with audio and video.
2. Started recording in vmix AVI to a NVME-Disk with 1 minute chunks.
3. converted recording to MOV HQ with the vmix converter
4. put the recorded files (5 Minutes) together in Davinci Resolve

Result: There are always one or two frames missing at the end (or the beginning) of the seperate recording files. So it is completely unusable in production use because you can't put it together later.

I tried it on an old DELL 7710 Workstation Laptop with a Nvidia M3000M but also on a modern vmix device with a RTZ 3080. No difference. Also tried it with or without hardware encoding. No difference.

Anybody have an idea?
Back to top

Wanna join the discussion?! Login to your vMix Forums forum account, or Register a new forum account.
Back to top  
jip  
#2 Posted : Saturday, January 25, 2025 10:59:31 PM(UTC)
jip

Rank: Advanced Member

Groups: Registered
Joined: 7/23/2013(UTC)
Posts: 123
Estonia
Location: North

Thanks: 12 times
Was thanked: 13 time(s) in 11 post(s)
Ran into the same issue with MP4 recording with 15 min splitting.

I think this is pretty unacceptable considering a master record of the production.
Back to top
admin  
#3 Posted : Saturday, January 25, 2025 11:49:38 PM(UTC)
admin

Rank: Administration

Groups: Administrators
Joined: 1/13/2010(UTC)
Posts: 5,166
Man
Location: Gold Coast, Australia

Was thanked: 4392 time(s) in 1541 post(s)
Unfortunately some video editors may drop some audio samples at the end of files and we have no control over that.

All I can suggest is to make sure your vMix is up to date, as there have been a couple of small fixes for this over the years, but as of the latest updates
both MP4 and vMix AVI should preserve the frames and audio between splits and it is up to the video editor to correctly handle them.

To make things more challenging, the audio format used with MP4 (AAC) can't be perfectly synced up to the frame rate anyway, so its not really the video editors fault either.

That said, it is also worth pointing out that vMix AVI is a fault tolerant format, so there is not really any need to use split recording for that.
So using vMix AVI is recommended and then converting that to MOV for Davinci Resolve.
Back to top
WWW BLOG
robertskiba  
#4 Posted : Sunday, January 26, 2025 12:51:43 AM(UTC)
robertskiba

Rank: Advanced Member

Groups: Registered
Joined: 8/22/2021(UTC)
Posts: 34
Man
Germany

Thanks: 3 times
Was thanked: 4 time(s) in 4 post(s)
I had the problem with Davinci Resolve, that is a very important editing software, so it should work, I guess.

Is there any way to open VmixAVI in Resolve? As far as I know, Resovle doesn't use any installed encoders under windows.
Back to top
admin  
#5 Posted : Sunday, January 26, 2025 1:38:33 AM(UTC)
admin

Rank: Administration

Groups: Administrators
Joined: 1/13/2010(UTC)
Posts: 5,166
Man
Location: Gold Coast, Australia

Was thanked: 4392 time(s) in 1541 post(s)
I've updated my initial reply with some more information.
Unfortunately its not really possible for exact split timing in MP4 due to how the audio is encoded, so its not really the video editors fault either.

If you do try vMix AVI, you can convert that to MOV using the vMix Media Converter included with vMix and then avoid using the split option entirely.
Back to top
WWW BLOG
admin  
#6 Posted : Sunday, January 26, 2025 1:42:43 AM(UTC)
admin

Rank: Administration

Groups: Administrators
Joined: 1/13/2010(UTC)
Posts: 5,166
Man
Location: Gold Coast, Australia

Was thanked: 4392 time(s) in 1541 post(s)
Another option i've just remembered is the WAV recording option.
https://www.vmix.com/help27/WAVFileRecord.html

This is a separate file that won't be split and can be synced up with the MP4 audio in the video editor timeline.
Back to top
WWW BLOG
robertskiba  
#7 Posted : Sunday, January 26, 2025 2:02:11 AM(UTC)
robertskiba

Rank: Advanced Member

Groups: Registered
Joined: 8/22/2021(UTC)
Posts: 34
Man
Germany

Thanks: 3 times
Was thanked: 4 time(s) in 4 post(s)
Originally Posted by: admin Go to Quoted Post
I've updated my initial reply with some more information.
Unfortunately its not really possible for exact split timing in MP4 due to how the audio is encoded, so its not really the video editors fault either.

If you do try vMix AVI, you can convert that to MOV using the vMix Media Converter included with vMix and then avoid using the split option entirely.


This needs to long to convert. After a show, sometimes the customer wants to have the recording in a fast time.

my workaround at this time is to record with a hardware device that can do ISO recordings and also works good together with Davinci.
Back to top
Users browsing this topic
Guest
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 © 2003-2025, Yet Another Forum.NET
This page was generated in 0.167 seconds.