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