3 Replies Latest reply: Jul 27, 2012 11:58 AM by Dave LaRonde RSS

    Video Codec: "None"

    thared33 Community Member

      When exporting to a lossless file, "None" is selected under Codec. Is there actually 'no' codec used for this export setting, or is it some kind of uncompressed lossless codec with no name? The file size is extremely huge.

        • 1. Re: Video Codec: "None"
          Mylenium MVP

          It simply dumps the pixel values without any optimizations as whatever is the default color model of the video format you use. E.g. the PIC image format is just a dump of one frame in Quicktime (or BMP on Windows) and a file set to "None" is basically just a sequence of these dumped buffers without any fancies. So yes, in a way there is "no CoDec" involved beyond some routine telling whatever encoder/ player is used to pass through the data unchanged.

           

          Mylenium

          • 2. Re: Video Codec: "None"
            thared33 Community Member

            I see. So there's 'somewhat' a codec for just telling the player, 'this is how to decode the video', but not really anything fancy. I'm also going to take it that the None Codec is 100% uncompressed. I was getting a 2GB file for a few seconds of video, and only a few MB for another lossless codec that I'm sure does use compression.

            • 3. Re: Video Codec: "None"
              Dave LaRonde Community Member

              thared33 wrote:

              I was getting a 2GB file for a few seconds of video, and only a few MB for another lossless codec that I'm sure does use compression.

               

              Correct.  There's a way to check in AE if a losless codec changed the footage during rendering: put the original footage in a comp, add the rendered footage and apply the Difference blen mode.  The differences will appear.

               

              But it really should be okay with a lossless codec.  Think of zipping a long work processor document.  The file size is smaller, but when you unzip it,you fully expect every letter, number and punctuation mark to be present an in the proper places.  That's a lossles codec.