2 Replies Latest reply on Feb 29, 2008 5:13 AM by Jonas Hummelstrand

    Rendering .avi files without increasing size of file

      I have 1. a DV/PAl (1.07) 25fps file 733MB sent by client
      2. Insert clip rendered as a .mov (the rendering software does not have other options)

      I combine the two in AE and render it out as an .avi file that I must return to client at same file size just with the special effect.

      PROBLEM:
      I render out as an .avi and the file increases to 6Gigs (not joking).
      The workaround is to take it into Premier and just reprocess the clip, which works, but adds an extra step.

      QUESTION:
      Is there a codec that I need that will allow me to avoid taking it into Premiere. If so please be specific. I tried DivX and it crashed AE, so maybe I have the wrong version????

      Thanks
        • 1. Re: Rendering .avi files without increasing size of file
          Mylenium Most Valuable Participant
          Nope. AE will always decode all footage to a full uncompressed RGB buffer, regardless which CoDecs you use. You cannot directly manipulate things at the stream level. Re-compressing is inevitable with all the downsides liek having to use other programs or loosing quality.

          Mylenium
          • 2. Re: Rendering .avi files without increasing size of file
            Jonas Hummelstrand Level 2
            Why must the rendered clip have the same file size? That way you will work on a compressed clip that you then recompress again and deliver so that the final output can be compressed again. That's three lossy compressions; guess how the final output will look!

            Instead: use lossless compression in the production and only output to a lossy compression format. DV is highly compressed and each recompression will destroy the image quality!

            I'd recommend that they deliver a QuickTime PhotoJPEG @100% or a QuickTime Animation @100% (which supports an alpha channel). Alternatively you can use the BlackMagic Decklink QT codecs for 10-bit lossless compression. You can then render back to the same codec and you will not cause any qualityloss during the process.

            - Jonas Hummelstrand
            http://generalspecialist.com/