Any explanation why a mp4 comprised of png would be smaller than all of it's images? Ultimately, I would like to lower the quality of my renders (png) if they are being butchered during "lossless" encoding. Why wait 2 minutes for each render when they eventually get dissolved to a lower resolution during processing? So what's the target png file size for lossless mp4 files to converge on a sum of their parts? Sorry if this question get's asked a lot.
If what you would like to do is to lower the file size of your images, the best way to do it would be to turn up the PNG compression to 100%. Blender has it at 15% by default. Don't worry, the PNG compression in Blender is lossless, which means that there will be no reduction in image quality whatsoever. The only con is that it may take a few seconds or so longer in order to deal with compression, but I find that the reduced space on the computer is well worth it.
There shouldn't be anything to worry about in terms of compiling images into a video. I would speculate that videos are more optimized for rapid viewing which could be why the files size is smaller than an equal number of videos.
do you mean like why a MP4 of whatever number of frames occupies less storage than the frames individually?. thats because a still frame stores more color information than a video (in most cases) and a video is a compression of frames played together as a single file instead of thousands. ideally in your case, if what u want is quality, you would want to render the frames at a higher resolution and then render the video at your desired resolution so that way compression isnt as bad. if youre uploading to youtube it will get compressed by the site anyway.