Speeding up the video speed without effecting audio pitch

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What would be just awesome,.. if you could speed up the video and the pitch of the audio wouldn't change.
Just like in the VLC player,.. you can make the clip go faster,.. the sound (voice) is of course faster too,... but the pitch of the audio does not change.
This is great for watching tutorial videos,.. most of the times they are too boring to watch at 100% speed.
If Camtasia Studio would offer that we could speed up what we have recorded (just like it is now) only without it effecting audio pitch,... well that would just be a phenomenal feature and you would have a much better product.

best,
Met
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met.hrovat

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Posted 8 years ago

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Randal Flamm

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Ditto. I've created a video of a person using our product. They use it slowly. I'd like to speed it up. The video will be part of a presentation to co-workers. Hearing a chipmunk voice is not what I want. 
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leighwilson

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It's absurd that this feature is not yet available in Camtasia, despite this thread starting 7 years ago and this feature  being available in Camtasia for Mac. Considering the costs of Camtasia upgrades, the lack of this feature is seriously causing me to consider other video editing software.
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wstewart

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Agree with @leighwilson times twice.
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videokurspl

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Agreed this feature is a must have.

I've found an easy to implement formula on Internet:
Let X be new video playback speed, be it 0.68x (68%) or 2.15x (215%).
Semitone shift = 12 * log(1 / X) / log(2)
For 0.68x => 12 * log(1 / 0.68) / log(2) = +6.68
For 2.15x => 12 * log(1 / 2.15) / log(2) = -13.25

https://fxhome.com/forum/discussion/45446/how-to-change-clip-speed-without-changing-audio-pitch?fbclid=IwAR0HH8JY13nVwKAMOb9zTgjPMR0gNvhdGR1wJ6-jOnHkl0hN_3TNFQLcFRw

With this formula it's just like 1-2hours of working with testing to make it live. Come on guys, do it please.
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videokurspl

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Do you really think that I have time for that? Why should I use two programs when I can use one? I upload each day 1-2 videos, adding additional step to my process is not the way to go, right?

Programmers are having JOBS to automate things, to make things less repetitive.

I'm programmer myself and when I can automatize something I will definitely take the easier path where I can save my precious time.
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kayakman, Champion

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sorry if I misunderstood, but you stated that ...

"1-2 hours of working with testing to make it live"

the last time I used the Audacity method, it only took a few minutes to adjust the audio pitch and get the corrected audio clip back into the Camtasia project

I use Audacity, Notepad++, and Beyond Compare 4, all the time to support my screencasting; all are 3rd party apps; to me, they are not a burden on my productivity, and definitely save me lots of time in completing screencasting tasks
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wstewart

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Hi Kayakman, I agree if you are only doing this once to a final, final, final work that will never change, it is probably almost always less than an hours work.  Although even then now you have an additional configuration management and tracking job to do with the Audacity projects in addition to the Camtasia projects, which across many projects (I am managing 215 of them) is a significant complexity increase. 

However, the problem gets a lot more difficult if the work is undergoing edits over time as evolutionary improvements are made, as is the case with my 8.5 hour Udemy course for example.  Many repeats of split and export audio, process with Audacity, import to Camtasia and make edits, make additional pitch changes, and have to repeat this all again with the edited work is not great for audio quality due to multiple exports around the Camtasia and Audacity loop.  I have found the quality of audio exports from Camtasia to be affected, quieter and losing something in punch.  And if  you only want to increase the speed of just one part of a longer Camtasia project, then the hassle increases again.

Bottom line?  The Camtasia speed up technology is basically useless for any work that has audio as well, without also having to learn Audacity and all the issues described in my post below.
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kayakman, Champion

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OK; appreciate your explanation

I really don't hardly run into the need to make speed adjustment/pitch adjustment; if I have to speed adjust a narrated segment, I do speed adjust, then silence original audio, and then use voice narration to get a new voice over

but it is always helpful if a desired need is built in, as long as that function works as good or better than the alternatives
(Edited)
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videokurspl

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""1-2 hours of working with testing to make it live""
I said it in the context of how much time it would take for a professional programmer to implement it IN Camtasia Studio.

Notice that Camtasia
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wstewart

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You can do it with Audacity, and I had to, but it was a pain.  Here are my learnings.

You have to first split the audio from the video in Camtasia, export the audio, learn Audacity, then increase the tempo of the exported audio track with Audacity, then increase the speed of all tracks in Camtasia the exact same amount, and then import the new audio, and ensure everything is synced.  (As explained in the next paragraph, leave the original split audio in the Camtasia project, even though it now has too high pitch, and just mute it instead.)

If you made any edits to your work before you do this, then you need to split and export only the audio of the edited work, since re-editing the audio of the full original video to match the edited video will be quite difficult, very hard to match to mouth movements for example.  However, if you do have to do that, which I had to in some instances, here is a trick - display the wave forms for both the audio from the original sped up video in Camtasia with the high pitch, and the wave form for the sped up audio from Audacity, turn off all the tracks except the Audacity sped up audio so that they won't be affected by any cuts, and then carefully cut out pieces of the Audacity sped up audio until the wave form exactly syncs with the visual wave form of the Camtasia sped up audio.  Then turn all tracks back on, except mute the Camtasia sped up too high pitch audio track - don't delete it since you might have to do this again, and want any edits you make to your work to be also reflected in that muted track so you can repeat this wave form syncing if needed (there are reasons this repeated work can become necessary) . 

If the audio speed up without pitch effects technology exists on Camtasia for Mac, it is exponentially more frustrating that Techsmith has not provided it on the Windows version, which some of us have to use for many reasons.

If they would like to reuse production quality software to add this capability, they could use the Audacity code since it is open source, or review and use that software to write their own if they want to implement in another language.

If you have to go the parallel Audacity route, two very important learnings.  (1) the Change Speed effect is not the right effect to apply, and instead you want to use the Change Tempo effect, just setting the percent change parameter, a pic can be found below.  (2) Do not use the checkbox at the bottom "Use high quality stretching", since despite the misleading name it is only intended for extremely small sub one second pieces of music, and in fact significantly distorts voice audio and results in much *poorer* quality.

Gosh, just a thought - incorporating this functionality in Camtasia would be much easier.  Would have saved me uncounted number of hours.

Change TempoPNG
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onegoodlife

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Any other video editing software that may have this capability?
Its evident that Camtasia won't implement this ever. Nor they care, as they cant be bothered to answer all these requests!