3 Replies Latest reply on Nov 8, 2009 10:40 AM by the_wine_snob

    Avoid encoding for Mpeg recordings

    Dr.Guitar

      I am using Canon FS10 for video recordings which records in MPeg2 to a SD card (MOD files). My understanding is that DVDs are recorded in the same format.  However every time I make a DVD, Premiere 7 Elements re-encods the videos which takes a long time. In fact it takes longer now to make a DVD from MPeg2 files than from Hi8 tapes I used before. Why is Premiere re-encoding the videos if they are in the right format for the final media (DVD). Is there a way to tell Premiere 7 Elements that re-encoding is not necessary and it just needs to put the videos in original format to the DVD.

      Thanks for taking the time to answer my question.

        • 1. Re: Avoid encoding for Mpeg recordings
          Kodebuster Level 3

          I'm sure others will add additional comments, but here's the workflow for Standard Definition for playing in the DVD-Video format.

           

          PE will convert internally to DV-AVI as this is it's default workflow for editing.

           

          When a Burn-to-Disc or Burn-to-Folder is the output, during the transcoding and Burn phase, it will again be transformed back to a DVD-Video format (Mpeg) for playing on a DVD set top player.

           

          There's no way of getting around this, it is, what it is...

          1 person found this helpful
          • 2. Re: Avoid encoding for Mpeg recordings
            the_wine_snob Level 9

            The problem is that MPEG-2 files are not Intra-Frame, i.e. they are GOP (Group of Pictures), so that there is only one full Frame for about every 15-18 "frames" that only record the differences between each I-Frame. PrE is based on DV-AVI which contains all Frames, and not just difference Frames. This is what your MPEG-2 source footage is "converted" to, so that one can edit on a Frame-by-Frame basis. Then, when done, if you are Exporting to DVD-Video, these "internally converted" DV-AVI's must be re-Transcoded to MPEG-2 - again.

             

            Some NLE's do offer "smart Rendering," where all unchanged GOP sections are NOT re-Transcoded. One of these would be a better choice when one has MPEG-2 source material and wishes to Export to DVD-Video. Unfortunately, neither PrE, nor PrPro, offers smart Rendering. For use with either, one is best served by not using any GOP format.

             

            Good luck,

             

            Hunt

            • 3. Re: Avoid encoding for Mpeg recordings
              the_wine_snob Level 9

              Here is a little example of GOP vs I-Frame footage:

               

              GOP_Example_01.jpg

               

              Probably the best summary of GOP is Jim Taylor's (one of the "fathers" of DVD-Video) "Birds on a Telephone Line." Basically, it goes: one is talking to a friend on the telephone and describes the birds outside of a window. The full description of the birds in the tree contains all of the info to explain to the person on the other end of the line, exactly what is being seen in full detail. One of the birds moves, but the full details are not given, only that one bird has moved - this is that "difference-frame." And so it goes, until the scene changes dramatically, then the full details are once again given, followed by only the new "difference-frames." *

               

              Good luck,

               

              * Heavily paraphrased from DVD Demystified, by Jim Taylor.

               

              Hunt