camtasia 8 playback out of sync

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I just downloaded Camtasia 8. I didn't know I was going to be using it for this project, so I already had audio files made for my voice over. I'm used to other video editing software, and I've been pressing the space bar to play and pause. When I play the audio clip, the playback is fine. Let's say I pause it because I want to add a callout or something. When I start to play it again, it doesn't pick up from where I paused it. It starts from several seconds ago, and a lot of the time I starts from the beginning of the clip. I thought maybe it didn't like that I used the space bar, so I tried your ctrl+space, but I got the same result. To work around this, I just have to start from the beginning of an audio clip. It's annoying, but it works. What's going on here?
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Jessica Brown

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Posted 6 years ago

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GregB

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That's weird.  So does the playhead move when you press the space bar?  (When I hit space bar to pause and play, it starts/stops exactly where it was.).  What about if you just click on the Play button?
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Timbre4, Champion

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I routinely record my narration sections and drag them wherever they need to be to go with the screen action. The timeline is rock solid, just takes a little to figure out the playback head and such. I'm in agreement with the person above that usually it starts from where you stopped and doesn't spring back to an earlier point. We need to know about your workflow I guess.
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Jessica Brown

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The playhead does not move when I press the space bar. The same thing happens when I click Play and Pause from the menu. What do you need to know about my workflow? I have MP3s, stills, and .camrec files sprinkled around the timeline.
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Timbre4, Champion

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Something's goofy; the playhead should always move across project timeline as shown below. The playhead is between the 10 sec & 20 sec markers and the time says 13;12 position. If you don't see that type of movement, something is wrong. Do you see and hear the project OK?

A CAMREC file insinuates video AND audio recording, although you may have just recorded video only and used CAMREC output format instead of AVI? Sounds like you have audio prerecorded as MP3 files and that is your audio source. That's fine.

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Jessica Brown

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Here's a video. I think the audio sounds a little distorted because I chose the record system audio, but you get the point. http://www.screencast.com/t/SJZVctARwX
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Jessica Brown

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Jessica Brown

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The playhead does move across the timeline. When I pause, it stops. When I play, it resumes from where I left off, but the audio does not resume from where I left off as you can hear in the video. Yes, I have prerecorded MP3s as I mentioned before. It's just really weird.
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Robert R., Online Community Admin

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Hello, Jessica;

Sorry to hear of the troubles you're having with Camtasia Studio. You mentioned that you have pre-recorded MP3 files, correct? Would you happen to know if they are variable bitrate MP3 files? Or what the sample rates are of the MP3 files?

Lastly, are the MP3 files stored on your local drive or an external / network / cloud-synchronized folder?

Do you have this problem with other projects where you're not using those MP3 files?
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Timbre4, Champion

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Great to see an example! That is strange. First project or has this happened before? Was it started natively in the CS 8.x version and not anything earlier?

I'd produce the camrec out to AVI [video only] and start a fresh project, bring in your mp3 audio and see how it behaves then. My theory is that the camrec file may be referenced for audio timing even though there isn't really any audio and I'd work to eliminate that variable. 

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Timbre4, Champion

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Variable bit rate! Good question.
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Jessica Brown

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This is my first project. I'm doing another one next week, so I'll use the voice narration and see if it makes a difference. The files are stored in My Documents, but My Documents is mapped to a network drive. The bit rate is 262 kbps. There are a couple files that are 263 and 261.
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Timbre4, Champion

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If possible, its better to have ALL assets local to the PC hard drive to eliminate network lag as a problem. That has to be ruled out.

Those are odd numbers so variable bit rate could be the problem. This is an encoding decision for better sound but it can play havoc depending on how you use them. Played by itself you'd never know anything was "wrong" but then you put it into a project and issues result. It may be possible to re-save them as constant bit rate files. What do you use to record with?

TIP: I write a script, record the audio with good mic as WAV for top quality. Import this as media to the project timeline. Then when you render your project (to mp4 for Screencast.com, YouTube, etc.) then it is applying the compression only once and you have a better sounding file at the same smaller file size.

iPhone videos use a variable bit rate to improve exposure. They don't play well and go out of sync. So I put these clips onto a timeline in Sony Vegas and re-render them to AVI (no loss and uses a constant bit rate). Then I can bring them into a project without sync hassle.

(Edited)
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Jessica Brown

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I'm in a crunch for time, so I'll just have to deal with it for this project. But the next one I'll store the files locally and see what happens--Articulate Replay has the same issue with network drives. The weird bit rate probably has to do with the way I exported them. I was having a problem with Audition, so I put the clips in the Final Cut Pro timeline and saved the project as audio only. I should have known something was weird when I put then on the Camtasia timeline and they were all extremely long when the longest one was only like 2 minutes. It's like it kept copying and pasting the audio over and over again, so I trimmed it. Anyway, thanks for the suggestions everyone. I hope to be ok next week.
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Timbre4, Champion

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I can relate to crunch, post an update later so we know how you made out.
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Jessica Brown

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Will do!
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Jessica Brown

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Sooo...my boss made some changes to my script (after the video was near done, of course :-) ), so I had to rerecord the whole thing anyway. I created a new project and used the voice narration. I saved those files and brought them into my current project. The playback is working nicely even without changing my save location (still on the network drive currently). Camtasia shouldn't have a problem with MP3's right? I suppose it was more of an issue with the variable bit rate than anything. HOpefully I won't end up having to use Final Cut in a pinch again. Thanks for all your help guys!
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Timbre4, Champion

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It happens. I now do videos for a product that KEEPS changing. MP3 files are fine with constant bit rate so nothing gets confused time-wise. Seems like the network connection is keeping up with the action. I daresay you are out of the woods now...
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Jessica Brown

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Yep!
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Yummy Bliss

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 OMG! Same thing happened to me! Does anyone know how to fix this? I'm a bit confused on what you guys are saying, can anyone explain how they fixed it?

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