logo

Live Production Software Forums

www.vmix.com

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

Notification

Icon
Error
Why does a QT RGBA Animation file's audio not appear on the meters?
Options
Go to last post Go to first unread
Previous Topic Next Topic
mmorlan62  
#1 Posted : Wednesday, February 13, 2013 4:39:43 PM(UTC)
mmorlan62

Rank: Advanced Member

Groups: Registered
Joined: 1/23/2013(UTC)
Posts: 65
United States

Thanks: 3 times
Was thanked: 7 time(s) in 5 post(s)
As I've been building my shows, I've noted the audio meters don't function or are out of sync with the actual audio of some video clips.

o AVC/MP4 clips: The meters show peaks about one second ahead of the audible audio playback peaks. The meters then freeze about one second before the end of the clip and zero out when the clip ends.

o QT RGBA Animation clips: the meters don't play at all. (And, audio is mildly distorted.)
o QT Sorenson clips: same

o WMV VBR: meters are about 1/8 second ahead of audio

I uploaded some test clips to my server with simple beeps and video flashes. If you wish, you may retrieve them here:

http://talltalepictures.com/projects/vmix/

I also note, QT files are just a bit slow to cue into the program window.

Michael
Back to top
WWW BLOG

Wanna join the discussion?! Login to your vMix Forums forum account, or Register a new forum account.
Back to top  
admin  
#2 Posted : Wednesday, February 13, 2013 8:25:50 PM(UTC)
admin

Rank: Administration

Groups: Administrators
Joined: 1/13/2010(UTC)
Posts: 5,208
Man
Location: Gold Coast, Australia

Was thanked: 4288 time(s) in 1520 post(s)
Hi Michael,

This is normal, the meter display time depends on the internal audio buffering "pre-roll" if each format.
For MP4/WMV etc the codec pre-rolls the audio for up to a second, leading to an earlier audio display on the meter.

QuickTime does not provide access to audio metering information hence why it is not displayed for this format.

Regards,

Martin
vMix
Back to top
WWW BLOG
amsudeen  
#3 Posted : Friday, February 15, 2013 10:46:50 AM(UTC)
amsudeen

Rank: Advanced Member

Groups: Registered
Joined: 12/20/2012(UTC)
Posts: 81
Man
Location: INDIA, TAMILNADU

Thanks: 5 times
Was thanked: 8 time(s) in 6 post(s)
The meters then freeze about one second before the end of the clip and zero out when the clip ends.

o QT RGBA Animation clips loop play not in smooth, tha last frame freeze and then play.

next question: RECORDING

START AND STOP RECORDING
FILES LAST & BEGINNING SOME FRAMES JERKY. HOW TO SOLVE THIS PROBLEM.

MY OS AND DATA DRIVE RAID 0 .
Back to top
WWW
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 © 2003-2024, Yet Another Forum.NET
This page was generated in 0.079 seconds.