Why are my MP4s so large in Camtasia Mac?

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I have recently switched from Camtasia Studio for PC to Camtasia for Mac.  Using my PC, I produced a 4 minute 1280x720 MP4 video at 56% quality with a frame rate of 15 fps, and it was 10 MB.  I just produced one on my Mac with the same settings, of 6:45 and it is 98 MB, rather than 18 as I would expect.  Even if I cut the quality level down to 10%, which is absolutely unacceptable visually, the file is 30 MB. 

What would the  difference be and what can I do about it?  I can't switch back to my PC, and I am producing over 14 hours of content - there's no way I can accommodate files this large. 

Thank you in advance for any ideas. 
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Laura Shoe

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Posted 5 years ago

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Sarah Benoit

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Official Response
Thanks for telling me to open a support ticket Kelly. They were able to give me really good instructions on how to fix this issue and clarified the steps involved. They responded within one day of my ticket so here is the fix for MAC users. Sorry it took me a couple weeks to get back in here and share. I have not used handbrake yet since the advanced settings Joseph gave made the file about 1/3 of the size which worked. Still pretty large but workable. I'll let everyone know if I have any issues with handbrake in the future. Here is what they gave me. The key was choosing "Main Concept mp4". I had not done that when I was trying to figure it out.

FROM Joseph Beaubien November 20, 2015 18:42

Hello Sarah,

Thank you for contacting TechSmith Technical Support. If you are looking to lower the file size of your videos created in Camtasia for Mac, I would recommend using the Share>Advanced Export, then select main concept and options to bring up the advanced export option. Once you have the advanced export option, you do have the option to adjust the file size using the quality slider there (which I would recommend setting to about 50-25% to get a smaller file size in your video: http://www.screencast.com/t/LTrtta2g4A

If your file size is still to large, you can try using a trans-coding application (Such as Handbrake) to re-encode your video to see if that helps with your issues. Here is a link to Handbrake (http://handbrake.fr) to re-encode the video and use the "web optimized" options to set the correct items for web playback. I made a screenshot with some steps here that walks you through the interface: Http://screencast.com/t/jaUq8s48

Please let me know if you have any questions.

Kind Regards,
Technical Support Specialist