logo

Live Production Software Forums

www.vmix.com

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

Notification

Icon
Error
MP4 "Fault Tolerant"
Options
Go to last post Go to first unread
Previous Topic Next Topic
seb666  
#1 Posted : Sunday, August 4, 2019 7:21:20 AM(UTC)
seb666

Rank: Advanced Member

Groups: Registered
Joined: 12/10/2016(UTC)
Posts: 126
Man
Location: Frankfurt, Germany

Thanks: 93 times
Was thanked: 19 time(s) in 14 post(s)
Did anyone try the new "Fault Tolerant" option for MP4 recordings? I did and the video which came out, was totally out of sync with the audio. The recording was about 12 minutes long and the audio is fine, but the video is kind of slow and more than a minute longer.
I'm cutting things on my Mac with Final Cut. The MP4 also wasn't readable on the Mac until I ran an indexing with vMix Video Tools. But the sync problems also exist on Windows (with or without indexing).
I'm recording 1080p with 25 fps. Could it be, that the "Fault Tolerant" option at the moment only works with 30 fps?
Back to top
WWW

Wanna join the discussion?! Login to your vMix Forums forum account, or Register a new forum account.
Back to top  
admin  
#2 Posted : Sunday, August 4, 2019 1:07:17 PM(UTC)
admin

Rank: Administration

Groups: Administrators
Joined: 1/13/2010(UTC)
Posts: 5,154
Man
Location: Gold Coast, Australia

Was thanked: 4349 time(s) in 1534 post(s)
Hi,

Thanks for reporting this, after some testing it appears the issue is with recording at audio bitrates higher than 192 with fault tolerant enabled.
Can you try at 192 Kbps to see if it solves the sync problem?

We'll also investigate why higher audio bitrates are causing this issue and hopefully have a fix soon.

Regards,

Martin
vMix
Back to top
WWW BLOG
thanks 2 users thanked admin for this useful post.
seb666 on 8/4/2019(UTC), Jeffry_Ghost on 8/12/2019(UTC)
seb666  
#3 Posted : Sunday, August 4, 2019 8:04:02 PM(UTC)
seb666

Rank: Advanced Member

Groups: Registered
Joined: 12/10/2016(UTC)
Posts: 126
Man
Location: Frankfurt, Germany

Thanks: 93 times
Was thanked: 19 time(s) in 14 post(s)
Originally Posted by: admin Go to Quoted Post
Hi,

Thanks for reporting this, after some testing it appears the issue is with recording at audio bitrates higher than 192 with fault tolerant enabled.
Can you try at 192 Kbps to see if it solves the sync problem?

vMix


Thanks Martin. I'm in the office tomorrow and will test with 192 Kbps and give you feedback.

Regards
Sebastian
Back to top
WWW
seb666  
#4 Posted : Sunday, August 4, 2019 9:37:19 PM(UTC)
seb666

Rank: Advanced Member

Groups: Registered
Joined: 12/10/2016(UTC)
Posts: 126
Man
Location: Frankfurt, Germany

Thanks: 93 times
Was thanked: 19 time(s) in 14 post(s)
I had our small vMix laptop at home and did a quick test with a recording, that I rerecorded with "Fault Tolerant". It worked with 192 Kbps Audio, with 384 Kbps I could reproduce the video delay and sync troubles. Also the file was readable directly after recording on the vMix machine with Windows 10 but not on my Mac. I had to reindex first, to use the video on the Mac.

Hope that helps. Now until getting the fix, I could use two recordings: one with fault tolerance and one without and best audio. ;)

Regards
Sebastian
Back to top
WWW
admin  
#5 Posted : Monday, August 5, 2019 8:20:44 PM(UTC)
admin

Rank: Administration

Groups: Administrators
Joined: 1/13/2010(UTC)
Posts: 5,154
Man
Location: Gold Coast, Australia

Was thanked: 4349 time(s) in 1534 post(s)
We've just released a vMix update that should resolve this issue.

Thanks again,

Martin
vMix
Back to top
WWW BLOG
thanks 1 user thanked admin for this useful post.
seb666 on 8/6/2019(UTC)
MarkNF82  
#6 Posted : Friday, November 8, 2019 12:09:01 AM(UTC)
MarkNF82

Rank: Advanced Member

Groups: Registered
Joined: 12/16/2018(UTC)
Posts: 67
Canada
Location: Newfoundland & Labrador

Thanks: 1 times
Was thanked: 6 time(s) in 4 post(s)
Originally Posted by: admin Go to Quoted Post
We've just released a vMix update that should resolve this issue.

Thanks again,

Martin
vMix


Just to add to this post (as of Nov 7, 2019 - 22.0.0.69) the audio sync issue is still happening at 384kbps.

The video seems to be ahead of the audio.

I have my recordings start with 5 seconds of black, to be sure a clean start. The video portion actually plays at 2 seconds in, while the audio starts playing at 5 seconds in, as expected. To playback properly in VLC, I had to sync the audio at -3.250 ms (hastened)

Thanks
Back to top
admin  
#7 Posted : Friday, November 8, 2019 12:48:15 AM(UTC)
admin

Rank: Administration

Groups: Administrators
Joined: 1/13/2010(UTC)
Posts: 5,154
Man
Location: Gold Coast, Australia

Was thanked: 4349 time(s) in 1534 post(s)
Hi,

I just ran a test and can confirm the issue is resolved.

What you explained is a bit different as the issue here was a slowly increasing video delay, whereas
a fixed delay sounds like either a video editor issue or a delay set in vMix somewhere.

Note that MP4 set to "Fault Tolerant" can't be used in many video editors without being indexed first using vMix Video Tools.

If you are still having issues noting the above, please drop us an email at info@vmix.com.au

Thanks,

Martin
vMix
Back to top
WWW BLOG
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 © 2003-2025, Yet Another Forum.NET
This page was generated in 0.155 seconds.