[Peter Diefenthaler]

In the Project window, right-click the footage and navigate to Modify > Interpret Footage. Then check “Assume this frame rate” and type in 25. Also double check that C4d didn’t actually render the .mov to 30fps. If you right-click the footage and select Properties, you can see the original frame rate.

Peter Diefenthaler
https://www.ideafirecreative.com/

[Peter Diefenthaler]

I figured something like this out a while back, maybe it will help.

Precompose the layer you want to calculate the area for and make sure the background is transparent. On the precomposed layer, add a slider expression control, alt click the slider and apply this expression:

sampleArea = [thisComp.width,thisComp.height]; // Specifies the comp frame dimensions
color = sampleImage(sampleArea*0.5,sampleArea); // Samples the colors of entire frame area

100*(color[3]*4) // Returns the percentage of Alpha within the frame

Note: You should be in 16 or 32bpc for this to be accurate and I don’t think multiprocessing will work with the “sampleImage” expression.

I hope this was helpful. Good luck.

Peter Diefenthaler
https://www.ideafirecreative.com/

[Peter Diefenthaler]

I’ve had issues like this before and determined that it was because hardware acceleration was turned off or not supported in the web browser. Chrome with hardware acceleration on gives smooth playback for me and might be worth a try.

[Peter Diefenthaler]

Sometimes when I get weird behavior like this, I purge the cache: Edit > Purge > All. I usually purge the cache before the final render also.

[Peter Diefenthaler]

Not that I know of. From my understanding that’s the nature of GIFs with transparency. GIFs only use one color for the transparency and don’t support semi-transparent areas. If you intend to use the GIF on a web page, my only suggestion would be to just make the background color in the image the same as the web page color.