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I've been using Camtasia 7 (and evaluating 8) with a Logitech analog headset. Noise removal has worked well in 7, but less so in 8 (this experience parallels another thread I saw recently).
I just purchased a Microsoft LX-3000 headset with noise-canceling mic. When I apply noise removal in Camtasia 8, it causes a strong background hum regardless of the sensitivity (-6 to +6). I tested this "double" noise removal in version 7 and the result is excellent, even compared to the raw output from the noise canceling mic.
I'd like to take advantage of the features in 8, but maintain the audio clarity I can obtain in 7. Any ideas how to eliminate the hum in 8?
Camtasia 8 noise removal is adding hum
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Hi Nick,
I got ahold of a project from another user that is having this issue and have some answers for you. It took a bit of digging but here's what I found out:
There is a bug with noise removal in CS8 that causes it to not be as effective as it was in 7. This is being addressed. However, this is NOT the cause of the hum being added when noise removal is enabled.
The noise removal components we use in CS8 will add hum to the audio if the incoming signal has a DC offset. This is most often caused by faulty audio hardware. It's easy to see it if you put the audio into an editor like Audacity (the waveform won't be centered at zero).
It's possible that the components we used in CS7 (which were different) automatically corrected DC offset. We weren't aware that the new ones do not do this. In the long term, we will probably be exploring a way to do that ourselves. For now, the only way will involve splitting the audio out to a separate file and using something like Audacity to correct the DC offset. I may post a quick tutorial showing how that can be done later on. If you can get as far as Audacity, the Normalize function (under effects) has an option for DC offset.
Sorry again for all the trouble, but thank you for reporting the issue.
RandyComment -
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I’m
frustrated
1Hi there
This suggestion is insane! I have camtasia version 7 and was very pleased with the way it silenced out background noise.
I now upgraded (and paid I might add) to version 8 and the sound removal just plain does not work by comparison to v7.
To tell us to output audio, edit in FREE software and then import back to then begin working on our camtasia video is madness and a little insulting when we paid for the product which we would expect to be as good if not an improvement on the previous version.
I hope you can correct this as for now, I wasted money on an upgrade I cannot use unless I want way more work. For now I am going back to v7 to keep up with the workload from my clients without having to export and edit audio elsewhere first.
Come on Techsmith, you can do better than this?
Martin Salter -
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I’m
disappointed
1I have a contributor who submitted 4 .avi files, all with 60-cps hum. The results of removing the hum with CS8 are all over the place. On one file, a +6 setting did an OK job. Two others show some reduction. The fourth file I can't make any better.
Frustrating? You betcha!
However, CS7 used to do a decent, not great, job on hum. Going to have to futz ( a technical term) with splitting out the audio and Audacity. Bleh.
Please fix ASAP... I'm hoping with an update to CS8.
Here's an idea, how about a built-in 50 and 60 cps filter with a check box as 99% of the time, if there's a hum, it's one of these two power-line frequencies. -
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1I noticed that there are many more glitches in this thing too.
Video jumps, when editing some of the call out features are all over the place. I think this was released well before it was ready. Overhaul maybe, but we are the ones testing it.
I am going back to 7 until updates are released to sort this out. This is eating in to time we do not have to spare for our clients.
Martin -
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For now, the only way will involve splitting the audio out to a separate file and using something like Audacity to correct the DC offset. I may post a quick tutorial showing how that can be done later on.
Where is tutorial? Specifically how to split audio, export to Audacity, remove hum, and import back to Camtasia. -
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I’m
disappointed
I also have the problem that noise cancellation is not working nearly as well as in CS7. I upgraded to CS8 when it was released but I haven't been using it because of this issue.
I make tutorials so sound quality is key for me, and I was looking forward to CS8 because of the new codec as there is a lot of motion captured in some of my videos. -
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downloaded 8.02 and it helped some of my clips.... others it did not help. still can not figure out how to use manual sound adjuster. I do 5 seconds of blank sound but it tells me To select a sound section as though I had not selected one already.
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Randy, How about giving a more useful reason for us to work with. The 5 sec message is misleading, but "for some reason" is not really any better. How about a list of 3 most common reasons...
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I'm sorry, I didn't mean to be vague. The truth is we use a third party component for noise reduction. We feed audio into that component for "training", and it gives us back a noise profile that we can later use while processing the audio.
"For some reason" is about as close as we can get at the moment. When I've tested it internally, some chunks of audio will cause the third party component to fail and return an error when we try to train it. There is no specific error, it just fails. We will probably be getting in touch with that vendor to see if there is a way to get more detailed information.
In general, I believe it fails if it determines the audio is unsuitable for noise training. This might mean that there are wild fluctuations in the audio that don't provide a steady pattern. It could mean that the portion of audio is completely silent. It could mean it is too long or too short. Anywhere between a half second and a second should be plenty of data to train on (that's what we use internally when working with the product).
Hope that is a little more helpful? -
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I remove noise in Audacity. No complaints. -
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I had promised a tutorial on how to remove DC offset from recordings before bringing them in to Camtasia Studio. Sorry it took so long, but here it is:
http://www.screencast.com/t/LY6XaDeGdSl
Hopefully that will help some of you. -
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How about a DC offset selector in Cam Audio correction panel.
This DC offset recording hardware issue is a fairly common problem with bad mic setups. (Most PC's & unbalanced mics.)
Using Audacity to stripping audio out & back via 16 bit conversions in will require more re-trans code steps and introduce more digitizing error in the final audio (shows up as harmonic distortion & poor quality Cam noise reduction results, ringing & strange canned glitches, etc.)
Anything to reduce conversion steps should help final quality... -
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