You have to remember that


You have to remember that with YouTube, when you upload a video, it gets recompressed by YouTube. So if you are uploading an HD video at a bit rate of about 12 or 13 Mpbs, Youtube will recompress it to where it might only be in the 4-5 Mbps range, maybe a little higher at 6-7Mbps.

Whenever I upload a h.264 HD file, I usually have my bit rate up in the 25-50 Mbps range so that when YouTube recompresses it, it’ll be in the range of a high-end DVD or low end Blu-Ray, usually in the 8-13 Mbps range. For SD I upload a DV-AVI, but as a progressive, as YouTube does a terrible job with interlace footage, and YouTube usually compresses SD to the 2-3Mbps range.

Also, you have to remember that h.264 is a MPEG compression, just like DVD’s MPEG-2, so it uses intra-frame compression, rather than the inter-frame compression used by DVCPROHD. And intra-frame does not like to be recompressed, as you’ve already taken away a lot of information.

But on the editing front, whenever I have to edit AVCHD or MP4, I always convert it to DVCPROHD (or if it’s standard definition, DV or DVCPRO50) or an uncompressed file so that I’m not working with an intra-frame copy, but rather I am working with each individual frame in inter-frame, and then exporting from a higher quality format. AVCHD & MP4 are good for final export, but are not good for editing.

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