Audio Slipping (Sync issues) steaming video.

Hey all,
I was wondering if this had happened to anyone else.
Since updating to Yosemite i've noticed a real problem when streaming video online through my web browser.
Regularly whilst watching a video there is a crackle on the audio track, then a second of the audio is repeated almost like an echo.
When this happens however the video caries on meaning the audio and video are out of sync.
This occurs on everything from Netflix, Youtube, DA Clips and other video sharing sites.
It occurs on Google Chrome, Safari and Firefox.
The only way to fix the problem and re-sync the audio is to reload the page with the video and begin again.
Unsure whether this is related or not but i've also noticed some slipping of audio when playing music in spotify. But obviously because it has nothing to sync up to you just hear the same word twice and it carries on, kinda like a scratch on an LP.
Would really appreciate any words of wisdom.
I'm currently running OS X Yosemite 10.10.1
Macbook 13inch late 2009 model
2.26 processor
4GB Memory
Many thanks
josh

In case anyone comes across this in the future, I've resolved my issue, and it had nothing to do with audio bit rates. In short, there seems to be a well-documented yet unfixed but in which an export from iMovie can lose sync if there are either slow-motion effects applied to a clip, or if the slow-motion speed is custom rather than pre-set by the software.
I changed my clips to 100% and everything exported fine, with no sync issues. For more on this, see the helpful thread here: http://discussions.apple.com/thread.jspa?messageID=10618532#10618532

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Hi everyone, long time lurker here, love the support you guys are giving!
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I believe the iPad 3 recording format is 1080/30p with 44.1Khz / 16 bit audio, but when I match those settings on a Premiere Pro CS5.5 project (or try 48KHz audio as a test), the audio gradually goes out of sync. If the video is several minutes long, it becomes quite obvious, and by 10 minutes, it's terrible!
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Sometimes there's no issue and the audio is in sync when imported into Premiere, but at other times it's way off.
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I used this to fix the audio on a couple of the videos you can find on this page (all of which apart from the last one were filmed on the iPad3)
http://www.cameralabs.com/features/Working_holiday/
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Interesting Audio Visual sync issue

Greetings,
I'm posting this to a few forums, hoping to get some feedback
regarding a strange, consistent, and somewhat unnerving issue
regarding drift between sync/streamed audio files and animation
sequences on the timeline.
A colleague of mine is doing an animation project over ten
minutes in length in Flash. He was reading frame numbers to create
a track breakdown for exposure sheets (old school) and noticed that
the sound was slowly drifting out of sync after a period of time.
He sent me an email to ask whether I have noticed the same problem.
We have both worked on projects using Flash as a tool for video
work.
I had not noticed the problem, never starting a project from
that direction, so I decided to do some tests. I created a 5 minute
(300 sec.) audio sequence of 1 KHz blips at every second. I
imported this file into Flash and set in on the timeline in stream
mode. I then made a little dot and made a one second sequence at 24
fps and copied that sequence up to 300 seconds. After 5 minutes
length over the time, the audio blip drifted away from the dot by
ten frames, or .4 seconds. The audio file also ends short of the
animation sequence.
I have checked this issue out adjusting different properties
of the audio:
a. Sample rate ( 44.1, 22, 11)
b. Bit rate (16, 8)
c. File format ( .aif, .wav, mp3)
I have also tested using different frame rates (15, 24, 30),
yet the drift appears to be constant.
I have an example of one of these tests up on my website
here
(http://www.csiga.com/flash/avSyncTest.zip). It's the 11k8b audio
at 24fps version. It's a tiny archive (38k), but decompresses to 6
Mb.
I would be very curious if anyone could share some thoughts
about this issue. It would be useful to find some way around this
problem. There are many Flash based productions that migrate to
video in New York where I'm based. I'm sure that the community
could benefit from any insight.
Thanks.
Jonathan Levy

The issue stems from the fact that Flash was never intended
to be used for such long timelines. As
far as it has come over the year - it is still a web tool.
Years ago I was in a production environment where we were
doing 22 minute shows for Cartoon Network
- we used Flash - we never exceeded more than 1-2 minutes per
Flash doc and often as short as 15-20
seconds.
We would use scratch audio which would get deleted before
exporting to quicktime - then we would
sticj each section together in the Avid (or Final Cut Pro,
Premiere, etc...)
So I recommend trying not to do a full 10 min (or 5 min)
timeline in flash - it will lead to other
problems like the FLA getting so big and ultimately crashing
(potentially).
Hope this helps.
-c
~~~~~~~~~~~~~~~~
--> Adobe Certified Expert
--> www.mudbubble.com
--> www.keyframer.com
~~~~~~~~~~~~~~~~
jonathanhl wrote:
> Greetings,
>
> I'm posting this to a few forums, hoping to get some
feedback regarding a
> strange, consistent, and somewhat unnerving issue
regarding drift between
> sync/streamed audio files and animation sequences on the
timeline.
>
> A colleague of mine is doing an animation project over
ten minutes in length
> in Flash. He was reading frame numbers to create a track
breakdown for exposure
> sheets (old school) and noticed that the sound was
slowly drifting out of sync
> after a period of time. He sent me an email to ask
whether I have noticed the
> same problem. We have both worked on projects using
Flash as a tool for video
> work.
>
> I had not noticed the problem, never starting a project
from that direction,
> so I decided to do some tests. I created a 5 minute (300
sec.) audio sequence
> of 1 KHz blips at every second. I imported this file
into Flash and set in on
> the timeline in stream mode. I then made a little dot
and made a one second
> sequence at 24 fps and copied that sequence up to 300
seconds. After 5 minutes
> length over the time, the audio blip drifted away from
the dot by ten frames,
> or .4 seconds. The audio file also ends short of the
animation sequence.
>
> I have checked this issue out adjusting different
properties of the audio:
>
> a. Sample rate ( 44.1, 22, 11)
> b. Bit rate (16, 8)
> c. File format ( .aif, .wav, mp3)
>
> I have also tested using different frame rates (15, 24,
30), yet the drift
> appears to be constant.
>
> I have an example of one of these tests up on my website
>
http://www.csiga.com/flash/avSyncTest.zip
> (
http://www.csiga.com/flash/avSyncTest.zip).
It's the 11k8b audio at 24fps
> version. It's a tiny archive (38k), but decompresses to
6 Mb.
>
> I would be very curious if anyone could share some
thoughts about this issue.
> It would be useful to find some way around this problem.
There are many Flash
> based productions that migrate to video in New York
where I'm based. I'm sure
> that the community could benefit from any insight.
>
> Thanks.
>
> Jonathan Levy
>

Multicam and multiple audio tracks sync issue, dual system shoot

I've got a pesky problem with the multicam feature that has me stumped. I've got two cameras, slated with a clapboard, and one track of location sound recorded dual system on a seperate recorder. I have no matched TC on any of the tracks, got to use IN point only. I've tried making a merged clip for cam 1, then making the multiclip using the merged cam 1 clip and cam 2. The video of the multiclip is in sync fine, but the location sound (which is A3 on cam 1) is always offset and way out of sync.
I've tried blowing away A1 and A2 from the cam 1 merged clip, putting the location sound at A1, and using that master clip to create the multiclip, but to no avail. Still out of sync
It appears that because the location sound has a different start time in the merged clip than the video, FCP is getting confused about what to do with it.
I've been successful with this method before, but the last time I had matched TC on the cameras. For some reason making the multiclip using the IN point for sync isn't working this time.
Anyone encounter this and have a work around or solution?
MacBookPro 2GhzDC 15" Mac OS X (10.4.6) Finla Cut Studio 5.1

I've tried blowing away A1 and A2 from the cam 1 merged clip, putting the location sound at A1, and using that master clip to create the multiclip, but to no avail. Still out of sync< </div>
Loyed's got way more experience with multicam than most of us so it's safe to follow his lead.
Not knowing exactly what's going on (sorry if you've already tried this), I'd sync up the audio and then export the newly merged clip as a self-contained movie. Reimport.
Hope you figure it out. Please return and post your solution for the benefit of those who come after seeking help with multiclips.
bogiesan

Sample rate and audio-MIDI sync issues

Disclaimer: I did read other posts similar to this but couldn't find an answer to my specific situation. So here it is:
Logic was perfectly fine when everything was running at 44.1kHz sample rate. Then I got vocals at 48 kHz so I had to convert the sample rate in Logic Pro to match it.
Suddenly I get a slew of "Error trying to sync MIDI and audio" messages. After crying and changing the sample rate back to 44.1, then to 48, and over and over again, it finally works again.
So Logic is fine at 48kHz. But when I go to a track that's at 44.1kHz, I get the sync messages again and have to play "toggle the sample rate" for about 5-15 minutes before Logic decides whose master again.
Why is it doing this? Do I need to change Logic Pro to some kind of default settings every time I go from one song to another with a different sample rate? Or will this not be an issue if I upgrade to 7.2? (I have 7.1.0)
PowerPC G5 Mac OS X (10.4.6)

This is not a bug, but a nuisance.
You should upgrade to LP 7.1.1, which is way more stable than 7.1.0. No need for you to go to LP 7.2.
"Then I got vocals at 48 kHz so I had to convert the sample rate in Logic Pro to match it."
Are you certain, that in your song, in your regions, you used the newly converted 44.1kHz files, chosen from the Audio Window, and not (still) the old 48kHz files?
"So Logic is fine at 48kHz. But when I go to a track that's at 44.1kHz, I get the sync messages again"
LP doesn't do this well. And for a reason, but we'll not get into this now.
See: "Audio > Sample Rate > ..." and select one.
Perform proper conversion and make sure ALL of your audio files running in your song are congruent. Check your Audio Window and the files associated to the regions.
Set up your autoload to contain these settings. From then on, whenever you know that you will be importing other sample rates, change the settings in "Audio > Sample Rate > ..." before loading the sounds/files, if indeed you are starting from scratch. This will save you significant time.
Been there, done that.
sonther

Premiere Pro audio sync issues with 48khz audio on video file and 44.1khz audio on external audio

So, I recorded video and audio on my Canon 5D Mark II at 1080p, 23.976 fps, and 48khz, 16-bit Stereo audio. And I used a Zoom H4 to record an mp3 audio file at 44.1khz Compressed. When trying to sync the audio in Premiere Pro CC, the audio slowly loses sync over time. I already tried to convert the 44.1khz mp3 file to 48khz in Adobe Audition. But that didn't fix the problem. Any ideas?

There's always time-stretch changes to the audio file with "keep pitch unchanged" checked, I suppose. Mind you, I've heard of people doing it but haven't done it myself. There's other possible options I'm sure. There's been quite a few threads here on time-sync issues over time.

Playback pauses and audio sync issues with live video stream

I'm seeing playback pauses about every three seconds and audio sync issues with our live demo stream when using the OSMF/Strobe player. It happens on both our 2Mbps 720p stream and our 480p 750Kbps stream so it does not seem to be related to higher resolution/bandwidth streams. It also happens if I point directly to a stream asset or if I point to a .f4v with both streams listed for dynamic so it does not seem to be related to dynamic streaming specifically.
The same live streams play back very well without pauses or audio sync issues in the Akamai's dynamic player and even slightly better with JW 5.2.
I have viewed the OSMF/Strobe playback on three different laptops of various age (3 months to 2 years) and two are Windows and one is Linux. I have also tried the various buffering options on the Flash Media Player Setup and Strobe setup and it has not made a noticeable difference.
To see the stream with the Akamai player, go to: http://live.kulabyte.com
To see the stream with the OSMF/Strobe player, go to: http://live.kulabyte.com/osmf
I do not have JW set up for public viewing yet, but the two above show the distinct difference.
We are really hoping to start pointing our customers towards the OSMF player because of the support provided by the community and Adobe, but we have to get the quality of the playback to be acceptable first.
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Hi Tim,
You need to add this setting:
dynamicStreamBufferTime=8
The actual value can be higher or lower. The best practice is to use a value that is twice the keyframe distance. Anyway, try different values and see which performs the best for your content.
I know that the setup page does not contain this option and it is not documented in the UserGuide. We simply missed it. Sorry.
Also note that the dynamic buffering algorithms are not being used for dynamic streaming content. I tried to explain this here:
https://sourceforge.net/adobe/smp/wiki/Dynamic%20Buffering/
Looking forward to your confirmation that this solved your issue.
-Andrian

Audio/Video sync issues after exporting

Two quick issues:
1. I've recently exported a project from FCE4 to quicktime and am finding that the audio is slightly out of sync with the video everytime.
Is there an ideal format or setting I need to export at to avoid this?
2. Also, I've edited two projects using the same clips and keep finding that the second one I make seems to make the video very narrow when I export it. Is there a setting I need to use to avoid this, or does the problem lay in the setup?
Cheers!
John

From what I see in your info, the clips don't match the Sequeunce.
Furthermore, the clips are not FCE freindly. Probably required rendering?
I'd suggest using Streamclip to convert the H.264 clips to the exact specs of one of the FCE>Easy Setups, audio and video properties, then start over.
http://www.squared5.com/
BTW: Whatever you convert the clips to must match the Easy Setup, so that you work with Clips and Sequence being the same. The best way to acheive this is to start a NEW Project, set the Easy Setup first, then bring in the the matching clips.
Using Item Properties in Browser>Seqeunce/Clip is one way to confirm matching specs for both.
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Audio Slipping (Sync issues) steaming video.

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