Strange Audio Blip

I have some e-learning where we have a little screen with some audio. Then there is a stop on the timeline. The user can click next and get the next screen.
On some of the screens the audio does a little "glitchy beep" at when it gets to the stop. It doesn't seem to happen all the time and there is nothing I can find in common when it does.
The glitchy sound isn't part of the mp3. When played in external players there is no glitch at the end of the file.
The sounds are set to streaming. When tested in the timeline it never makes the sound.
Local testing also doesn't produce the sounds.
When played over the internet is when we hear it. But if we replay that screen it doesn't happen on the second time.
There is a keyframe with the streaming sound. And where the wave form shows the end of the sound we have put another keyframe.
I'm leaning a little bit toward the glitch being the first few milliseconds of the next screens sound. They are all on the main timeline. We have the stop at the end of each screen and then there is an empty frame and then the start of the next screen. And generally there are at least one or two frames before the next audio starts.
But that seems strange that Flash would stop on, say, frame 1353 and then look ahead to 1357 and start the audio there. Doesn't it?
Anybody else have this issue? Found any answers?

Further digging only seems to muddy the waters.
Adding one extra frame before the new audio begins (there were already 3) seems to make the difference. But then that doesn't really explain why it was doing it. And if extra frames are the answer how many will I need?
I did some digging and there seems to be a 46 millisecond delay built into the way AS2 handles sounds. I'm wondering if it is some kind of timing issue that depends upon the framerate, the number of samples in the first sound, processor load, and the sound card. If so I'm going to have a really hard time coming up with a solution...
Anybody?

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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.
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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
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< 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.
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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.

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Get strange audio from other parts of the video when I am using transitions

In most cases when I add a transition, I get a strange piece of audio inserted during the transition. I know I can go in and manually edit this out, but is there some sort of fix to keep this from happening in the first place?

Hello, Rick,
Welcome to the discussions.
Yes, that is a problem that happens sometimes, especially with the Cross-Dissolve transition. I use that one a lot, and run into this with many of my clips. I have 'fixed' it with a variety of methods including muting, putting music over it, adding audio clips recorded from the beginning of the next clip....for this one I have to delete the transition, crop the next clip, remove it to the clips pane, add back the transition and record the audio from the deleted clip using WiretapPro. Works great and actually is faster than it seems.
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If you also have iMovie 8, you will see its plist as com.apple.imovie7.plist, so be sure to trash the correct one.
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Strange audio

Hey all, So I am having a strange problem with audio. When I import a song from Itunes or anywhere else it sounds fine when I play it on my TV. I play the dvd and listen to it on my 2 speakers and it still sounds fine. For some reason when I play it on a tv that doesnt have external speakers the audio sound really bad. Kind of hollow sounding with no base. To correct this problem in the past I would just center up the slider on the audio track which I think just makes it mono. I really want to be able to play dvds in stereo, Anyone have any idea whats going on?

Are the audio mono or stereo on your timeline? If they are stereo both will get affected if you edit either one of them, if they are mono only the one you are editing will make changes. Try to select both tracks of the audio and choose Modify > Stereo Pair or hit option + L on the keyboard.
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Message was edited by: sigrdr
null

Strange audio problem in Premiere Pro CS6

Hi
I have encountered a very strange problem. I am editing a documentary film in Premiere Pro. All material has been shot on the Sony FS 100 camera - imported into PP with the Media Browser. In one interview the last part of a clip has corrupted audio. At one point on the timeline the audio stops playing, and it sounds like a scratch on a vinyl record - two words repeating themselves to the end of the clip (See screenshot of timeline). The images are as they should. When I open the Avchd source clip in VLC the audio is working. When i Import the clip into Final Cut 7 using Log and Transfer the audio is working. My only other option would be that there is a software problem with Premiere Pro CS6. Any ideas of how to fix this issue?
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One similar, potential problem, that can develop, is when the Conforming process is interrupted, before it completes 100%.
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What could be causing a VERY strange audio lag?

Hi,
This is a problem that I have begun experiencing in the last week or so and I have found a post on another site of someone who is having the same problem. I'm not sure if it is an update gone wrong but it is nothing I have never seen before in my years of video editing.
Ok here's what's happening...
If there are two audio tracks (say a stereo music track), when I push play one tracks runs slower than the other. However this is where it gets interesting... One thing I observed (very noticeable with headphones on) is that if it is the left channel which is running slow, when you pause the video and push play again, the right channel then becomes the channel which runs slow. It swaps channels every time you pause and play. With the slow channel, there is also a good half a second delay before it starts after the good channel (and vision) has begun. So if you are listening to music, it will start in the left channel then the right one will come in slower about a half a second later. Then you push space (pause) then space (play) and the same happens but it starts in the right channel.
The computer I have is very powerful and all my hard-drives are internal so I can't see it being a system issue. I also only reinstalled my computer fully a few weeks ago so I know that junk on my computer isn't the issue either. As from other checks, it also happens in other projects, even older ones which I had finished ages ago and never had any problems. The problem actually went away earlier this week but has just come back so it seems to be an intermittent problem.
Very strange... Any ideas or assistance would be great as I have come to a bit of a standstill with this.
Matt

Hi,
Here's the answers:
Where did the audio come from? I have tried a few various methods which all have the same result including bringing in a stereo 48KHZ aif or using footage captured from the tape (stereo only - the problem goes away if they are changed to two discrete mono channels)
How was it copied to the computer and imported to FCP? Either captured in the case of footage from the camera or from an AIF file where it would be dropped into a bin and then onto the timeline.
What format is the audio in? Sample rate? Everything is at 48KHZ.
What kind of sequence are you working in? I only use two types of sequences and it happens on both being HDV - 1080i50 and DVPAL 48KHz Anamorphic.
Is the audio's format native to your sequence settings? Yes, both for the captured footage and the imported audio.
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Audio Blips in transitions, Part VIII ... continuing

Driving me crazy, practically ALL of my transitions have the sound click or blip at the beginning and end of a transition. I've got music on the second track- so all I want is silence - everying set to zero, nevertheless... So, I've deleted the transition, extracted the audio from both sides, added a new transition (between two clips with zero audio... and Viola'!! Sound blips are there again. (and I tried deleting the audio clips... this combo is not working. Here's the apple advice:
(new input WELCOME...thanks)
You hear a pop or gap during a title or transition in iMovie
After applying a title or transition, you may sometimes hear a pop or brief period of silence between the transition and the next clip.
This can happen when using iMovie versions 3, 4, and 5.
If you experience this, try extracting the audio from your video clip to a separate track before applying the title or transition. Follow these steps:
Select the affected clip.
To undo the title or transition you have added: From the Edit menu select Undo, or from the Advanced menu select Restore Clip.
Select the video clip in the timeline.
From the Advanced menu, select Extract audio. The audio for the selected clip will be moved to its own audio track in the timeline.
Add your transition or effect.
This document will be updated as more information becomes available.

I have noticed a lot of users are having problems with the audio noise that sometimes arises when you insert transitions. The Apple workaround is to extract the necessary audio and then uncheck the video sound box in the video/audio timeline viewer as this is where the static is caused.
However, this tends to be annoying if you want to either edit or perhaps add further transitions that cut through video where you have already extracted the audio.
I think another option for iMovie HD 5.02 is a workaround that I had used constantly back in iMovie 3.03. That is to add a title transition (with nothing in it) that floats over the transition where the sound glitch occurs!
For example
1. In iMovie HD 5.02, cut the clip before the sound glitch using command-T.
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3. You will either get a magnificant solution to your problem (which is especially good as it is an undoable feature by pressing backspace after the clip is highlighted) OR you will get one more sound glitch at the end of the title effect. BUT IF YOU REPEAT THIS PROCESS by adding (and you might as well make the effect as long as possible) title effects throughout the whole project, the amazing thing is that when these effects run together - You get no noise!!!!
Ok, you might get noise if you were unfortunate enough to finish the title effect right on a transition and in this case you obviously need to ensure that you don't do this by varying the length of the transition.
IN SHORT....
1. Ignore the problem until you have finished your project.
2. (Worst case) Add long blank title effects starting at the beginning and continue adding them until you reach the end.
An added advantage is that this beats the endless audio extraction that some of you will otherwise have to do to "fix" this annoying problem.
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>system prefs>accts>login items
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