Saturday, February 25, 2012

YouTube and Bitrates

People say that if you are uploading videos to YouTube, you should upload them at 5,000kbps (YouTube's supposed bitrate for HD movies)

The problem with that, is that YouTube re-compresses movies once you have uploaded them. So if you give them a shitty low bitrate file, with lots of compression artifacts, YouTube's re-compression will exacerbate the artifacts and make your video look even worse...

This is why it is a good idea to upload your video files in very high quality. If you are using an AVCHD camera and have filmed at 1080 24p 24mbps, you should output your file in Premiere (or whatever) in AT LEAST those same quality settings (Audio too) . That way you will keep the quality of the original file when you are finished. This is your master copy. Upload that master quality and you are giving YouTube the best possible video to work from when they re-compress it.

It makes perfect fucking sense and I don't know why people insist on uploading to YouTube in shitty low bit rates.

 Here is a simple analogy to help people out with deciding what bitrates to post their videos in YouTube.

1. Take a sheet of paper.
2. Crumple it slightly. Un-crumple it and then crumple it more. (re-compression)
3. Flatten it again. Looking at the piece of paper you might see some small folds or creases due to the "compression." Looks fairly decent as far as plain sheets of paper go, doesn't it?

4. Now get another sheet of paper.
5. Crumple it harder the first time and then again the second.
6. Looks like shit when you un-crumple it doesn't it?

That's re-compression for you. If you take a pile of shit and stamp on it a bunch of times, It still looks like shit... just more broken up, smelly and on the bottom of you nice shoes.

YOUTUBE BITRATE TEST 5,000 KBPS ORIGINAL

YOUTUBE BITRATE TEST 25,000 KBPS ORIGINAL

Things to look for:
1. The artifacting on the edges of text.
2. The artifacting on the water.
3. The artifacting on the edges of the tent.

These artifacts are definitely more pronounced on the lower bitrate encode.

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