Yea quicktime is no longer used in any of our projects do to it's problems and since it's not longer supported.

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With that said though, I do have one question, are you using PAL or NTSC ? ( It may not be relevant, but you never know. ) I also noticed those videos are blurry ( of which compression CAN do that too, but check that too when you go to save the export ). Also youtube has it's own compression, which makes it even worse, if your video is compressed to begin with. When I upload to youtube, I always upload the raw uncompressed video.

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However, if none of that is the problem, then I am wondering about framerates. Human eye can only see 24 frames, but the picture is clearer the more frames you add. 30 is a good minimum.

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And this brings me to another point, if you have no sound, then you literally can set it to 30 FPS, instead of the typical 29.97 that you would have if there was audio. Over time that makes a huge difference as well. ( It might not be relevant, but I'm trying to think of different scenerios off the top of my head. )

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Also, double check your ffmpeg output settings if none of the above is relevant. It could be some bit setting is set too low. It can be something as simple as that.

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Hope this all helps in some way.