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  • Bit Depth

  • Jason Schoenfeld

    October 13, 2010 at 4:01 pm

    I am working with AVCHD video (which I understand is 8bpc) in After Effects. When I change the composition bit depth settings to 16 or 32 bpc what, exactly, is that doing to elements within the composition? Is, all of a sudden, a video that’s 8bpc going to magically become 16 or 32 bpc? I do understand that some effects that support 32 bpc will look better, I just don’t understand what happens with video or, for example, a jpg image. Thanks for the help.

    Jason

  • Jason Schoenfeld

    October 13, 2010 at 4:27 pm

    Forgot to mention that I’m working in Leopard with AE CS4.

  • Kevin Camp

    October 13, 2010 at 4:37 pm

    putting 8-bit footage into a 16/32-bit comp won’t change the footage at all… it’s still 8-bit.

    what it will do is allow effects that are 16/32-bit to use all those extra bits.

    i think this tutorial demonstrates some of that:

    https://www.videocopilot.net/tutorials/earthquake_with_32bpc/

    i think andrew actually ‘fakes’ 8-bit to 32-bit footage by using blending modes, but i think it illustrates how you might benefit from using a higher bit depth for compositing.

    Kevin Camp
    Senior Designer
    KCPQ, KMYQ & KRCW

  • Jason Schoenfeld

    October 13, 2010 at 4:48 pm

    Great tutorial, thanks. I’d been to video copilot and saw the HDRI tutorial and that’s what got me thinking about 32 bit and how it applies to elements that are only 8 bits. Thanks again.

    Jason

  • Jason Schoenfeld

    October 13, 2010 at 6:43 pm

    Thanks Dave. I have been having problems with AVCHD/mts ever since I’ve started working with it – mainly compatibility issues (iMovie, FCE and even some in Premiere Pro). I just recently updated to the 9.0.3 version and AE seems to handle it pretty good, but I will definitely look at converting to a different codec. I’ve been capturing the footage with a Canon HG10 (which I really like), but I’ve heard that the AVCHD codec can have compatibility issues. Why is this the case and why would Canon use it?

    Jason

  • Jason Schoenfeld

    October 13, 2010 at 9:24 pm

    Other than compatibility issues, and shooting really fast motion. most of the reviews of AVCHD have been favorable. I’m not a big fan of the the fact that it doesn’t shoot 30p, but no big deal. But a couple of months ago I noticed that I had some problems keying out green from some stuff I shot. So is AVCHD a lesser quality HD format?

  • Michael Szalapski

    October 14, 2010 at 1:41 pm

    Excellent answer, Dave. Love it. Especially the description of 4-1-1 color resolution as “stinky”. 🙂

    Jason, I believe this covers what Dave said along with some more info you might find useful.

    – The Great Szalam
    (The ‘Great’ stands for ‘Not So Great, in fact, Extremely Humble’)

    No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.

  • Jason Schoenfeld

    October 14, 2010 at 4:03 pm

    Yes, thanks for all the help and info. I’ve got a much better feel for what I’m working with – especially understanding the 4-1… color profile stuff, which I’ve never really understood before. A friend of mine and I were also discussing AVCHD the other day and I really didn’t have much information. So, this clears up a lot.

    Thanks again,
    Jason

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