Quote:
Originally Posted by Randall Leong
(Post 1472933)
Cineform is yet another form of "lossless" compression. In this case, it can preserve the qualities that make AVCHD what it is - a super-efficient lossy codec which can produce remarkably high image quality at very low video bitrates.
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Cineform isn't anywhere near lossless. What it gives is something kind of the same idea as DV for HD... no intraframe compression (eg, like DV, but unlike MPEG-2 or AVC, every frame is independent of one another). It's much faster for editing purposes. Also much larger... HDV and DV run about 12GB per hour, while Cineform for 1080/60i HD content is usually over 50GB per hour. But do the math... that's compressed.
Cineform is, in fact, is based on a set of mathematics called wavelets, which is a fundamentally different compression technology than DV, JPEG, MPEG-2, and AVC, all of which are based on use of the discrete cosine transform. Not too important to know the gory details (I do, but I'm not trying to write a book here), just note that because wavelet is different than DCT, the kind of compression artifacts you'll see (or not see... these are pretty high quality CODECs) are different.
There are some free technologies that do the same kind of thing as Cineform. The first, available today, is the Avid DNxHD CODEC. You can get this free for Windows (under Quicktime) on the Avid website. But the good news here is that this has been accepted as a standard, it's now SMPTE VC-3. Like Cineform, this has been designed to much lower in CPU use than MPEG-2 or AVC, but also to withstand repeated encoding and decoding without much damage, which is critical when you're doing heavy editing on video. I believe DNxHD is based on DCT, but it's new, and from a high end company like Avid, fairly trustworthy.
Another standard in this space, though not quite ready yet, is Dirac Pro, which was invented by the BBC in England. This is very much like Cineform, based on wavelets. The Dirac format was created by the BBC with the idea that they, as well as the world, needed a video format for archival that was very high quality and not dependent on any patents or proprietary technology. It's too early to know just how fast this will be for editing, as it's kind of experimental at the moment. But it's coming... and the family of Dirac technologies was accepted by SMPTE as VC-2, so this is another open source industry standard.
Quote:
Originally Posted by Randall Leong
(Post 1472933)
And I think Vegas can edit 24 Mbps AVC files. But when you render it out, it will recompress because the Sony AVC encoder does not support video bitrates above 17 Mbps. (I tried manually setting the video bitrate to 18 Mbps using the Sony AVC encoder, and the program would not render the video but give an error message instead.)
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That seems to be the case. You can actually get somewhere around 20Mb/s from the Main Concept AVC CODEC in Vegas. But the Sony encoder seems to be fixed at 17Mb/s. That may be based on the specific profile they're supporting. AVC is a huge thing, and there are all kinds of different levels and profile specifications that mandate just which of the big set of magic tricks you can use, the maximum video formats (I have trouble with Vegas on 1080/60p video in MP4/AVC from one camcorder... could just be bugs, but there's definitely an issue here), etc.
Quote:
Originally Posted by Randall Leong
(Post 1472933)
And Cineform does not come cheap: You will spend a minimum of $130 (on top of what you've already spent on an NLE) to do a proper transcode of AVCHD material to something else.
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You can buy Neo Scene from Videoguys for about $100, as I did. But there's a big problem with their activation procedure.. I'm basically locked out of using Cineform, even after buying it, and their tech support people have not solved the problem.
If it's just editing speed, try DNxHD if you're doing pro-level stuff, it may solve the problem. Otherwise, you can render out AVC in one of the higher end Sony MXF formats with virtually no loss. These use MPEG-2 at very high quality (better than HDV), and that's actually included with Vegas. The main issue there might be repeated layered edits.. I don't know if MXF/MPEG-2 would hold up as well as Cineform or DNxHD. But if it's just to get faster edits, try the MXF... it's built-in.