Chad Perkins: Another big problem with these DSLRs is how they compress the video files that they create. Initially, they were meant to be deliverable files. You would just record the videos and then post them online or turn them in to your boss or whatever. But with the proliferation of DSLRs, we often want to use them in post. But because they're already so heavily compressed, there is really not much room to play around with them when you're in post-production. For example, this heavy compression makes it really challenging if you're trying to remove green screen.
While more pure footage removes green screen more cleanly and evenly, even the best green screen footage shot on a DSLR is still really compressed and creates artifacts that are just a beast to remove. And then when you want to composite that footage with other material, it's so compressed that you really can't adjust the colors very much without destroying the footage. That being said, it can be done. When the Canon 7D first came out, I shot a huge series of visual effects shot for an iPad app that I made before I realized how horrific the compression was.
I made it work, but it was a chore. In some of these DSLRs, like the Panasonic GH2 for example, they have a mode that will allow you to choose an alternate means of compression such as Photo JPEG. This is definitely preferable to using the usual H.264 if it's at all possible. Again, as I pointed out, you can make these files do some work in post with light visual effects work, compositing, and so forth, but it can be difficult if not impossible to get these extremely compressed files to do what you want them to do.
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