user35106: A client asked me to do an animated product visualization in 3D and then render out the animation in 4K with a transparent background to put on their website. The animation is done but if I want to export it without background I realized that Quicktime is the only option. The 4-sec video then becomes 1,8GB in size! Is there any way around this or do I have to tell them that we can't go with 4K? or can I compress it or use some other format? The animation is also choppy in the video exported without background. When I render out an MP4 with the background it runs smoothly.

user26178: Probably a good option, depending on the animation, is a CSS or JavaScript animation of a PNG sequence. This works well for 360° animations.
https://www.google.com/search?client=firefox-b-d&q=360+javascript+animation

35106: <p>A client asked me to do an animated product visualization in 3D and then render out the animation in 4K with a transparent background to put on their website. The animation is done but if I want to export it without background I realized that Quicktime is the only option. The 4-sec video then becomes 1,8GB in size! Is there any way around this or do I have to tell them that we can't go with 4K? or can I compress it or use some other format? The animation is also choppy in the video exported without background. When I render out an MP4 with the background it runs smoothly.</p>
 26178: <p>Probably a good option, depending on the animation, is a CSS or JavaScript animation of a PNG sequence. This works well for 360° animations.</p>
<p><a href="https://www.google.com/search?client=firefox-b-d&amp;q=360+javascript+animation" rel="nofollow noreferrer">https://www.google.com/search?client=firefox-b-d&amp;q=360+javascript+animation</a></p>
