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Twitter's video story is not their strongest. I used to run an account that posted a lot of video content, and their compression quality was so mixed that I ended up writing a little mobile app that would transcode videos to Twitter's advertised optimal format (720p 30fps H.264 5Mbps + AAC LC) before uploading them.

Even then, it was a crapshoot whether or not the video would look like a pixel collage, and I'd need to delete the Tweet, tweak the video a bit, and try again.