MP4 video quality drops significantly part-way into a 4 min. video

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  • Updated 8 years ago
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I've created multiple training videos using the built-in screen capture in Camtasia for Mac. I'm exporting them to MPEG-4, H.264, 1250 bitrate, optimized for streaming, multi-pass for best video quality; the intended use will be for online streaming.

In each video, the video quality starts-out good, but then at some point drops dramatically. I've tried letting the export be the only thing I'm doing on my Mac to help allow for more processing bandwidth, but the video quality keeps hitting a wall. And once the quality drops, it doesn't recover & go back to the better quality.

I've attached a small screen capture of both good & bad pixelation. The bad pixelation occurs at 1 min. into a 3m45s video.

HELP!

Good:


Bad:
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Mark Halley

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Posted 8 years ago

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Shane Lovellette, Employee

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Hi Mark,

Wow, not sure what is going on here. The best way to troubleshoot is to work directly with our Technical Support team. Would you mind submitting the issue here: http://techsmith.custhelp.com/app/uti...

They can work directly with you to figure out what is going on.

Thanks for letting us know!
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Paul Middlin, Employee

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Also, you may not want to use the mpeg 4 codec provided by apple, which I believe you are right now. It's honestly not very good. Instead, make sure you are using "MainConcept MP4" if you are going "advanced export". Or, just use the quality slider in the normal "Share->Export..."

For me, at the default quality, the mp4 it creates is nearly indistinguishable from a lossless video. It's quite fantastic.

Please let us know how it goes!!
Thank you for taking the time to contact us with this odd problem.
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Conan Heiselt, Employee

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Hi Mark,

Wow. That's some pretty impressive degradation. Not good.

Here are a few things to try:
1) Make sure that either the canvas is the same size as the video you're editing or that you've zoomed in to 100% (aka. "Scale to Actual Pixels"). Anything else (zoomed in or out) will result in at least slight pixelations because of the scaling.
2) Try using the standard Export. You probably aren't gaining much optimization using the Advanced Export and getting the settings correct is really tricky.
3) Try progressively raising the quality slider a little bit at a time in the Export dialog if the initial output still is pixelated at all.

Let me know if these don't work--and maybe let everyone else here who has a similar problem know if anything does.

Conan.
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Mark Halley

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Thank you, you 3, for your quick reply! I was hoping to get something this AM, so thanks!

@Paul - I don't see an option for "MainConcept MP4". Is that an addon I need to go get? Under Advanced Export, these are the options I have:

And under Export, I don't see any kind of a quality slider. If it makes any difference, I'm using Camtasia 1.2.2 (47238).

@Conan - Can you help me understand how the zooming affects the export? I did a screen capture video, then adjusted the entire canvas to the preset "YouTube HD (1280x720), & then set the scale to 80% so it would fit the adjusted canvas. I don't see an option for "Scale to Actual Pixels". My actual size is 1440x900, but I want it to be exported at 1280x720. When the scale is set to 100%, this is what my canvas looks like:


So I set it to 80%, which gives me this:


Am I approaching this a wrong way? I'm open to feedback.

Thanks to you all!
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Conan Heiselt, Employee

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Hey Mark,

After some conversation with Paul, it seems that there may be something odd going on if you're only seeing that extreme pixelation in one spot.

Would you mind opening a support ticket so we can look into this more closely?
http://techsmith.custhelp.com/app/uti...

To answer your questions about scale there are a few videos that should answer your questions:
-- http://www.techsmith.com/tutorial-cam... (up to 1:35 is relevant)
-- http://www.techsmith.com/tutorial-cam... (talks about zooming in & panning to show detail when your recording is larger than your canvas--it specifically uses SmartFocus, but this all applies to manually added zoom)

Conan.
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Mark Halley

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Thanks! I've created a support ticket #120203-000098. I'll also check-out those links. Thanks, again, for your help!

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