Disable processing for media

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  • Updated 4 years ago
In Camtasia for Windows and Mac (I use both very regularly) I would like the ability to "disable processing" for specific items on the timeline. 

The scenario here, is that I've already rendered a video to MP4, but need to append or prepend other video to the existing MP4. If I can "disable processing" for the MP4 on the timeline, the rendering of the new video would be significantly faster, and higher quality, because I'm only processing the changes, instead of the entire video.

I don't see this option available right now, but if it is, please let me know how I can utilize it.

Cheers,
Trevor Sullivan
Microsoft MVP: PowerShell
http://trevorsullivan.net
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Trevor Sullivan

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Posted 4 years ago

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Timbre4, Champion

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Hello,

I must be missing something; the rendering process is for ALL content on the timeline. How could this be otherwise and yet include all of the content together in a single output?

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Jack Fruh, Champion

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Hey Trevor, I've only ever seen a single video editor in history try to do this. It never got very popular unfortunately.

The Idea is great in theory, but is such a complex thing under the hood, that users would have to be pretty much experts at all things video, which isn't the market Camtasia is positioned for.

For starters, Video is usually done as 1 Full Frame, followed by x difference frames. To my knowledge, the format has to stay the same the whole file, much like resolution has to stay the same through the whole file. 

Lets say the format used on your first render is one full frame per every 30. If you're going 30 frames per second and you end on an exact interval of 30-1, then it would makes sense that you could splice that in front of some other content. But what if you're 15 frames short of hitting that full frame? Then you can't just concatenate the two video files because the rule of 
1/29/1/29/1/29 would be broken:
1/29/1/29/1/15/1/29.

An alternative for advanced users like yourself might be a small utility that concats video files without re-encoding. I've not used them but a search result for "concatenate two video files without re-encoding" turned up mp4joiner.org  could be worth a look.

I'd argue that this is a complex enough topic that there will always be better things to spend the development dollars on - For example, I know right now they are working on making the project files cross platform, which would be a good bonus for anyone using both Macs and Windows - I'd rather have that!
(Edited)
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Trevor Sullivan

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I think Sony Vegas lets you do this. If I recall correctly, I was specifically using Sony Vegas MovieStudio Platinum a number of years ago. I don't have it in front of me, otherwise I'd take a screenshot. Basically, what it let you do is select a particular video clip on the timeline, that you'd already rendered externally, and tell the editor not to perform recompression on it. When you render / export, the editor would skip over processing that segment, and only render the portions that it needed to.

I don't know how it worked under the hood. All I know is that it existed, and it would be great if Camtasia could do something similar. To restate the benefits of doing this, you'd see: 1) decreased encoding times, and 2) greater quality of videos, due to reduced reprocessing.

Because I don't know how this works under the hood, I can't really say whether this would require a significant amount of development effort. It's not so much about "this or that" feature, but rather just pointing out that Camtasia users would benefit from having this available. Whether or not it should be prioritized is a separate discussion.

Cheers,
Trevor Sullivan
Microsoft MVP: PowerShell
(Edited)
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Jack Fruh, Champion

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Sounds awesome! I've never used Vegas, but have heard good things about it.
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Timbre4, Champion

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I've been using Vegas since version 2.0; it's a different animal for different purposes IMHO. I believe there is a misunderstanding here about it in regards to rendering options. You can indeed select a portion to render by highlighting a region (markers appear and render region only checkbox is checked) - however the resulting clip will ONLY be that portion.

If this question is about rendering speed, Camtasia 9.x is slated to be a 64 bit program and better take advantage of multiple processor cores. In most cases, the amount of memory available for processing really makes some difference. The WIN 7 Ultimate i7 box I have for video and audio work has 16GB of RAM and the progress bar moves along briskly.

In summary, I think we are on the cusp of Camtasia taking a big leap in this regard.

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Trevor Sullivan

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I agree, Sony Vegas is a different tool, but there are certain features that it has, that are appropriate for Camtasia, while others aren't. I think the misunderstanding is in regards to my original request. I'm not referring to selecting a portion of the timeline. I'm referring to importing a clip into the timeline, and on the properties for that specific clip, disabling reprocessing (or recompression, if you prefer) for it.

Cheers,
Trevor Sullivan
Microsoft MVP: PowerShell
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Timbre4, Champion

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I understand and appreciate the desire not to reprocess media (already compressed) to avoid further degradation. Given the way I understand rendering works I do not see how you can render anything less than the total project to get an output that includes the total project. The rendering process has to consider everything as it's building the frames for the final output.

Regarding workflow, I keep everything in uncompressed AVI and WAV form until final rendering to avoid predicaments like this. If you already follow good housekeeping like this and you got a compressed clip from another party, request a higher quality clip to work with. Otherwise you're likely going to live with the current results.

Just trying to set reasonable expectations here and share some experience*.

(* what you get when it doesn't work the first time) 

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