Strange Audio Synch problem

I've been supplied with a movie (from an HD master) in .mpg format (for ease of size) to which I need to synch an audio track for a Blu-ray release.
When I open the file in MPEG Streamclip it gives the frame rate as 23.976. However, when I import this same clip into FCP it gives the vid rate at 25fps, with no audio (but it's there if I open it in Quicktime).
If I convert the .mpg to ProRes I the get the audio in FCP, but the running time is altered - even though I've not changed anything, making it useless to synch to.
Example:
.mpg file = 01:35:49:20
ProRes conversion via MPEG Streamclip = 01:35:44:00
I've also been supplied the same file at 25fps (for the DVD release). The same problems occur with this too.
So my question is, how do I synch a new audio track to the movie and ensure everything is kept in synch?
Would I be better off exporting from MPEG Streamclip to another format?

When you open this file up in Quicktime, what does it say the frame rate is? Because it sounds like it is 25fps, so you need to set MPEG STREAMCLIP to convert it to 25fps.
Shane

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AUDIO SYNCH PROBLEMS

I have never had an audio synch problem 'til now. I am running 10.5.7 on a 2.8 GHz Intel Core 2 Duo 4 GB ram, 24" imac.
iMovie 6.0.4
I have a 50 minute heavily edited project with many transitions, etc.. I have no problem with the footage downloaded from my Sony HD camcorder. I even saved many individual frames as pictures and changed them to the beat of the music in the timeline and all worked perfectly. BUT, my problem is with the "video trailers" I slipped into the timeline. The audio slips when I play back in the timeline AND when burned to DVD. BUT, it does not slip in the same place every time I preview it. If I scrub the playhead back over some of the bad scenes and play them again, they are in synch. IT KEEPS CHANGING..... When I export to a desktop movie to review - the synch problem is there and some of the audio is missing. This only happens on "movie trailers" I have downloaded.
I can't figure out why it keeps changing in the timeline and then correcting itself when I back up and play it over again. I AM GOING CRAZY........
Thanks in advance for any suggestions.
Wally

Thanks for the reply but my problem is not with iDVD - it is with iMovie - when I add "trailers" to it they go in and out of synch at different places everytime I review it before moving on. When I scrub back over the problem area and then play again, they are perfect for one time and then I try again and they are not synched. The problem is in iMovie.
Thanks,
Wally

Audio synch problem

I have a 1 1/2 hr program in HDV that I'm having audio synch problems with during export. All my frame rates for my clips are the same as well as my audio sampling rates. It will start fine, then be slightly off and by the end of the program that audio is behind by about 3 seconds. I've tried all formats, reference file, self-contained, Anamorphic DV and still no luck. Any ideas?

Exporting Quicktime movie...current settings, video and audio....just uncompressed right out of FCP.

Audio synch problem from 24 to 29.97

I am working for a tv show that is having a major audio synch problem.
We send our mix to an external sound house for our pro-tools mix. They request the file to be 29.97, though our timeline is 24. In turn, we export a 24 time line, re-import to an 29.97 timeline and than re-export at 29.97 with a time code burn. They export the mix, using a sound compressor that converts the mix to a 24 fps synch, we send them a 24 frame export that they can check it againest on their end in Final Cut Pro. For them, both the opening and end two-pop lines up. When we recieve the mix back however, and bring it onto our timeline, it is always 24 frames ahead of the picture. We can't fiugre out why.
I know this all sound very confusing.
Below is our export and timeline settings:
OUR TIME-LINE\EXPORT SETTINGS:
1st Time Line:
FS: 1280x1080
FPS: 24
Compressor: DVCPRO HD 1080i60
Aud Rate: 48.0 KHz
Aud Format: 32-bit Floating Point
1st Export:
FPS: 24
DV\DVCPRO - NTSC
Compressor: DVCPRO HD 1080i60
Aud Rate: 48.0 KHz
Aud Format: 32-bit Floating Point
Data Rate: 2.9MB/sec
2nd Time Line:
FPS: 29.97
Compressor: DV/DVCPRO - NTSC
Aud Rate: 48.0 KHz
Aud Format: 32-bit Floating Point
2nd Export:
FPS: 29.97
Compressor: DV\DVCPRO - NTSC
Aud Rate: 48.0 KHz
Aud Format: 16-bit Integer
Data Rate: 3.6 MB/sec
AUDIO MIX SETTINGS:
Data Rate: 140.6 K/sec
Aud Rate: 48.0 KHz
Aud Format: 24-bit Integer
Total Out: The audio is exactly 24 frames ahead of the video by the end of the clip
We shot on a Panasonic HDX900
Can anybody think why this might be happening?

ProTools mixes 24fps...and 23.98, which SHOULD be the case here. There is NO REASON why they should want a 29.97 mix, nor should they mix at that rate...because you are not working at that rate nor delivering that rate...are you?
Your sequence settings confuse me. DVCPRO HD 1080i60 runs at 59.94. You can get it to 23.98 with a little work...but you indicate 24fps. Is that SOLID 24fps? Not 23.98? If so...that is a major issue. You should not be working at 24fps. 23.98 is the frame rate...
Still...if you are working at 23.98 and delivering a 23.98 master, the audio guy needs to mix at 23.98. ProTools is capable of 23.98. If they can't do that, then I'd suggest finding another mixer.
Shane

Audio Synch Problem Exporting From imovie 6

I have a created a large imovie project in imovie 6 using pictures and imported video. The project uses a lot of extracted audio voice overs on top of the photos.
While trying to export the video to quicktime or idvd, the audio gets out of synch at various points. I have tried exporting it many times using a variety of different options, and the audio remains out of synch, sometimes in different places with each export. Lastly, I have extracted the audio from the video clips for some of the more problematic portions of the project, but that has not proven successful.
The odd thing is that the movie plays perfectly while in imovie.
Any suggestions as to how to correct this issue?

Hi
Tedious situation.
To avoid this I'm kind of strict in Audio in two ways
A
• Material used if video is in same frame per minute - else I use JES_Deinterlacer to convert all to one standard. I use PAL = 25fps - one of my Cameras records ONLY in 30fps - (some people records in 24fps - to get a movie feel - I never)
So keeping the fps from Camera to (in my cases) DVD - gives a supperior result
B
• I'm strict in the kind of Audio formats I use - ONLY .aiff (or from miniDV tape Cameras) AND THEN 16-bit 48kHz or from Audio-CD (still .aiff as on normal CDs) and here 44.1kHz
If Camera is set to record in LP-mode or 12-bit Audio - Then I use an external Audio Editor to get this right
If from iTunes - I never use this directly - BUT - collect needed audio into a New PlayList - BURN THIS as a Standard Audio-CD (NO .mp3 - but .aiff here too) and then use the files on this CD in my movie project's in iMovie HD6 or FinalCut any varsion (or if forced to - iMovie'11)
Else read this
Audio Sync problems
• 12.bit - should be 16.-bit (from miniDV tape - set Camera right)
Avoid recording in LP-mode on miniDV tape. This tape must be play-backed by same Camera. When Camera dies
so does the video material in worst case.
• .mp3, .avi etc strange file formats - should be converted to .aiff 48kHz 16-bit
• in iMovie (up to HD6) - do - Extract Audio - it most often helps
• from iTunes - collect into a PlayList then Export out as an Audio-CD (not .mp3) and use the files on this (.aiff 44.1kHz)
• There seems to be a problem with slow-down resp speed-up. Has to be in specific steps as 25% 50% 150% 200%
else problems will arise
• Audio problems when transitions is in use - especially iMovie HD/HD6
a. Select video clips
b. Extract Audio (Advance menu/Extract Audio)
c. Now apply transition
d. eventually fine-tune end and start of extracted audio clips
Yours Bengt W

Strange Audio Recording Problem

Hope someone can help!
Out of the blue, we set up to transfer 9 tracks
via 9652 into Logic Pro 7. Done this many times.
Got everything setup, track names, record file path,
started the input and the meters are moving in the channels.
All looks good. Record enable all tracks, hit Record,
all looks good - except no wave info is showing up, ie - no
recording is happening. I also noticed that the Bar Ruler
turns red when recording - I do not remember seeing
this - but this may be normal.
NEW Info:
When I say "No Recording" - usually, as the SPL moves
across the screen, the recorded audio tracks show up
behind it. Well - in this case - the SPL moves across the
screen, and nothing appears behind it.
This song is set up as a "project" and all of the folders
that are normally created for a project have indeed been created
by Logic. We are sure that this is cockpit error on our part,
we just have never had this problem ?!?!?!?
Any ideas??
Dave Shirk
Pamlico Sounds
Dual G5 Mac OS X (10.4.3)

The Ruler should be red when recording. Verify you have an audio channel selected if nothing is created after the SPP. From the sounds of it you are not even creating audio files/recording, as opposed to blank audio files, correct? After that verify you have all the right settings or try 1 track at a time. The objects are still existent and enabled? (This would show full channel strips for each track-which you can for example, insert a plugin). A few suggestions. Can you do this from a higher level of the arrange?

Strange audio slipping problems??

I've been having problems with audio tracks slipping. It's only .mp3 music files... here's what happens: I'll lay down say 10 seconds of a music track in a timeline. A few minutes later I realize I need the music to run 3 seconds longer. I drag it out, and then render. This causes the music track to slip 3 or 4 seconds further into the song. The waveform display on the audio track looks exactly the same, but the song has slipped for some reason. It's been driving me nuts because if you spend some time keyframing volume and then have to extend the clip a second or two you basically have to start over. Anyone have any clue why this would happen???
Thanks!!

Rule # 1 (or 10, I forget): Do NOT use MP3 files in FCP. Instead, first convert them to AIF format at the sampling and bit rate that matches your FCP Sequence settings.
To adjust a song's duration, highlight the clip and hit Command j to bring up the speed adjustment window.
-DH

Strange audio sync problems

I was experiencing problems similar to those I've read in other threads here, where AIFF files imported into FCP were gradually drifting out of sync. On my current project, I switched the audio to MOV files instead hoping that would alleviate the problem, but it didn't. Here's the situation I most recently encountered:
I have a 7-minute film which is broken up into three QuickTime MOV files, each file containing both video and audio. I also have the audio saved in a separate audio-only MOV file. When I place the three video segments sequentially in an After Effects timeline and then drop in the audio file, the audio file is exactly as long as the video, to the frame, and it sounds perfectly in sync throughout. But when I drop the EXACT SAME FILES into FCP, the audio file is 10 frames shorter than the video. Listening to it, it the audio file starts almost imperceptibly out of sync with the embedded audio in the video files, but this gets worse over the course of the 7 minutes until it sounds way out of sync (by 10 frames).
Anyone have any idea what's up?

Wow.... funny thing... I've had the same problem for YEARS..... And this is why I'm here... to ask this EXACT same question.....
here's my story.. I work at a computer research facility... we record hour long lectures on our sony HDV Camera...
we also record the un-eq'd audio, for editing purposes, using Logic Express v. 7.1.1 on a Powermac tower w/ a 933 mhz G4 processor... 1 gig ram..... OS X v. 10.4.10....
the microphone interface is a maudio octane preamp into the maudio Delta 1010... w/ pci interface...
This Powermac is dedicated to capturing audio... nothing else.
Right now I'm editing on a dual 3 ghz quad-core Intel MacPro w/ 8 gigs of ram... OSX v. 10.4.11 (won't upgrade to Leopard till the bugs are gone)... But I've been on the top of the line Mac's for 5 or so years... G5's... Dual G5's... Quad G5's..... you name it... and each machine has had the problem (yet to be described)....
My workflow is:
Raw HDV.... > captured directly into Final Cut Pro... > Import the 44.1 (or 48 khz.. no difference) aif file created by Logic Express on the "Audio capturing Mac"... (16 and 24 bit... doesn't make a difference) ... then I'm prepared to work....
THE PROBLEM....
I place the video on the timeline.... it's got a stereo audio track with it that is synced PERFECTLY with the video......... then... i place the "un-eq'd" audio on the timeline.... Sync up the beginning frames... the audio and video fit perfectly together at the beginning of the talk...... 30 or so minutes into it, the audio has gradually shifted to being a quarter or so second off.... by the end of the talk.... the audio and video have about a second or more gap between them...
The problem isn't the camera... We've recorded talks for 5-6 years with multiple DV and HDV cameras.... we've always had the same problems..
The problem isn't the "audio capturing computer"... we had a G5 in there, but figured it was WAY too much overkill to have that machine in there just capturing 1, 2, 3, or even 4 audio tracks every couple of weeks or so...
The problem isn't hard drive speed... we've had multiple hard drives.... on multiple machines... no difference....
as far as we can tell... it's not hardware...
I've been to Macworld and WWDC... Talked to Apple's engineers about the problem.... nothing..... I've had apple's video support on the phone.... nothing...
no one in the entire industry seems to know what our problem is....
we've done basically everything you can think of...
The problem is really annoying... but I've been working around it for years.....
got any ideas?
Message was edited by: wierdOne

12 bit audio synch issues

Hey all. I have a queation regarding 12 bit audio synch problems. I have digitized a tape recorded with 12 bit audio and am just now coming into video/audio synch issues and was wondering if anyone might have a workflow suggestion. Soecific questions are -
1 - Can I export the troubled clips to quicktime/ resample them at 16 bit and reimport?
2 - Some of the clips I already have edited and are in synch, do I need to correct them as well or will final cut do that on export?
3 - If I get a 12 bit/16 bit mixed bag on my timeline, can I export the mix to 2 track and convert before exporting it to compression?
ANy suggestions on how to work through this would be appreciated. I seem to have a lot of people coming to me with this setting and would like to know of any viable workflow solutions.
Thanks

1. Yes. Quicktime Pro, iTunes or third party audio editing software such as Peak can resample to 48khz/ 16 bit.
2. It would be best if you can get everything in the timeline to be 48khz/16 bit.
3. See #2.
Dope slap these fools who bring you 32khz stuff. Charge them MUCHO extra for your time.
x

Major "BUG" in Imovie 9 - Audio Sync Problem on Export !

Well I'm a hard-core Apple user from day one, but unfortunately today I'm not to proud about the latest version of Imovie 9.
It seems there has been a "MAJOR audio sync problem on export" in Imovie 9, since July 2009. Apple knows about this bug for a long time now, but didn't release any bugfix yet!
Here's what it's all about:
It seems if you use the (custom /manual) speed-adjustments and not the preset slider speeds, you will experience (after exporting your movie) annoying bursts of audio from clips that had been set to mude. The strange thing is that you will only experience this audio-bug after exporting, you will NOT experience it in the project playback mode!
Here's what you can do:
Find ALL the clips in your Project that are Speed Adjusted.
Instead of using a "Custom Speed" percentage, use any of the "Preset Speeds"
Preset Speeds on the Slider = 12.5%, 25%, 50%, 100%, 200%, 400%, 800%
Then, export your project as usual.
No more sync issues.
Really hope That Apple will come up with a real BUGFIX soon.
It's a shame that a major bug in a otherwise GREAT PRODUCT, hasen't been fixed yet!
What's wrong with Apple?...this is not one of their finest hours.
Still A BIG fan from Imovie HD,...I'll chance to Imovie 9 when the bugs are finaly fixed!

This is TERRIBLE! I have spent so much time working on this project, and I really don't want to adjust the speed settings to the preset levels, BECAUSE I need to motion of the video to match certain musical points. I can't re-film my video, and I needed this project done TODAY. I made a music video with some kids at summer camp, and today is the last day- the day we were supposed to all watch it together, and now, I've got NOTHING!!!! (Because I can't export it without all those glitches!)
I am MAJORLY DISAPPOINTED on this one. I've made movies in windows movie maker before, and purposely used imovie, because you know, everything on macs is supposed to be better. Well, I guess I was wrong.

Audio dissolve problems after export

Hello there.
I have a problem with audio dissolves. If I export the mastermixed file, the is strange and the mixing isn't right. Where I put a audio dissolve in fading in or out the music sometimes is doubled.
In Premiere, everything sounds fine. When I export in ProRes I get these audio problems. Before the update to 8.1 everything went well.
Any ideas?
Best regards,
Florian.
OSX 10.8.5
premiere CC 2014.1

I got it. It's the AME export! If I export the file directly with Premiere I have no strange audio probs but if I export the soundfiles or the program file with Media Encoder 2014.1 the dissolves are really bad...

Annoying audio-input problem

I have a really strange and annoying problem. Everytime I boot up, I have to change the mic-volume in Audacity for any audio-input to work.
Does anyone have any idea how to fix this? I've had this since I installed Arch Linux.

I assume you've read this.
Is there anything that sets volume during startup? Check rc.local.

[solved] Strange Audio Issue

I am experiencing a strange audio issue with my Intel-HDA ICH7:
# lspci -v
00:1b.0 Class 0403: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01)
Subsystem: Hewlett-Packard Company Unknown device 30a5
Flags: bus master, fast devsel, latency 0, IRQ 22
Memory at d2400000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access>
when I installed Arch linux the first time a mounth ago on this computer, I had a sound problem that was solved in a very strange way.
Everything worked fine until a week or so (I believe from Alsa 1.0.12). Now sometimes sound works and sometimes it doesn't. For example sometime I boot the computer and have no sound, then I reboot it without doing anything, and then sound works.
I have tried messing with the modprobe.conf:
# /etc/modprobe.conf (for v2.6 kernels)
# --- BEGIN: Generated by ALSACONF, do not edit. ---
# --- ALSACONF version 1.0.11 ---
#alias snd-card-0 snd-hda-intel
#alias sound-slot-0 snd-hda-intel
# --- END: Generated by ALSACONF, do not edit. ---
#options snd-hda-intel model=F1734
options snd-hda-intel model=z71v
options snd-hda-intel position_fix=1
but it was useless. If I put back the modules in rc.conf everything is worse: sound doesn't work at all.
A diff between lsmod in a "working boot" and a "without sound boot" showed that the same modules where in kernel memory.
A diff between dmesg showed this difference:
< hda_intel: azx_get_response timeout, switching to single_cmd mode...
was present in the not working boot. This line is absent in a working boot dmesg.
The only way to make the sound card working everytime is to remove the snd* modules load from the boot sequence and load the modules "by hand" after the login.
Any ideas?
PS : If something is unclear due to my poor English please tell my and I'll try to explain it better.

phrakture wrote:snd-hda-intel is screwed up - on my thinkpad I had to go into the bios and enable the modem for sound to work. Oddly enough, the modem was off by default.
Also, mine has no PCM listed, I need to use "front" as my PCM level... not to mention the UI is way off with 'tpb' (if you have a thinkpad)
Yes it's not an Arch Linux related problem: I had problems with Debian (Etch and Sid based distros like ubuntu) too (but there I had no modprobe issue on the init sequence. Maybe is a problem of shared IRQs, but I have to study the existing documentation as I am a newbie). The difference is that Arch is simple enought for me to try something like modprobing "by hand" in the init sequence. PCM seems to work, however the volume is very low and I have found no way to make the mic work. Under Mepis I was able to make it work only if I plugged it in windows xp and then reboot into Linux. But I can't try it with Arch as I have erased the windows partition...
I will try the new kernel, study the documentation and then report. Hoping this will be usefull to others too.

Audio synchronization problem in Elements 7

The audio in my Elements project has a background hum. So I exported the audio, removed the hum in Audacity, and saved the new audio as a wav file. Then I deleted the original audio track and replaced it with the cleaned up version. But now the audio doesn't synch with the video.
Since the project contains many clips, some of which have been moved within the project, I thought about exporting the audio one clip at a time. But I can't find a way of doing that. Even when I unlink the audio and video, select only the audio clip, choose work area only, and try to export the clip, I still get the audio for the entire project.
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You must change the in and out points on the Work Area Bar - this is not the same as selecting the clip on the timeline.
The quickest way to set the WAB is to place the CTI (the play line) to the start and press [Alt] plus left facing square bracket ( the [ key ). Place the CTI at the end and press [Alt] plus right facing square bracket ( the ] key ).
In the following image the WAB is set to the area I want to export. The CTI is nowhere to be seen (it does not have to be) and the clip covered by the WAB is not selected (it doesn't have to be). Only the area covered by the WAB is important.
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Cheers,
Neale
Insanity is hereditary, you get it from your children

FCP: AUDIO SYNC PROBLEM

i have audio sync problem -- of the finished product which didn't have that problem before. does anyone know how this could have happened? in my earlier posting, there was a warning window which i played around w/ and now i have an audio sync problem in my prior projects.
please help me.

The Reels, are indeed the 5 surround channels. I have a feature that is broken up into 8-10 minute sections. I did this because the composer was using a G3 at the time and couldn't handle the whole movie at once. They are 16bit 48khz aif files exported from ProTools. The biggest thing here, is that at one point everything was in sync. I am trashing the preference files now to see how that works.
It's not a playback issue as well. When i scrub one frame at a time, the sync has drifted off later in the clip. It's very strange.
In my previous post I said the one of the Reels was in sync. That was because I recreated it, by making a new project and copying the video from the timeline, and re-importing the 5 audio streams. It didn't work for any other reels though. it is still out of sync in the main project.
Trashing prefs did not work.
Also, I tried a lot of the things in that technical doc, but non of them worked including trashing prefs.
The real weird part is that the Audio file SAYS it is the same length of the video, but the audio ends later. It's in sync in the beginning but not at the end.

Strange Audio Synch problem

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