4 Replies Latest reply on Aug 1, 2009 10:16 AM by Colin Brougham

    How to export DV AVIs without re-encoding?

    Moxie Cat Level 1

      I'm a newbie to Premiere who was recently tasked with capturing AVIs from a Mini DV camcorder using Premiere Pro CS4 on Windows Vista. I managed to capture full-quality DV AVIs in Premiere (720x480, 29.97 fps). All I need to do is make minor edits to the AVIs and join them where appropriate in an NTSC/DV 4:3 sequence in Premiere (some tapes were captured in sections). All of this I can do.


      Question 1: Is it simple to export these joined AVIs without re-encoding? I have tried exporting the AVIs out of Premiere (Adobe Media Encoder) as Microsoft AVI files, with all the default DV settings. But I am concerned that I am re-encoding the AVIs, which I do not want to do. I would love to just use the captured AVIs and not have to resave them, but because they were so chopped up during the capture process, I need to join them and resave.


      Is this a legitimate concern? Should I use a program like AVIDemux or VirtualDub instead to join and export these AVIs? I have read on other forums that these programs specifically have settings for "don't re-encode."


      Question 2: Some of my clips captured as 32000 Hz files because 12 bit audio was the setting that had been used when they were recorded. For those clips, I did change the sequence's audio to 32000. But the default export for Microsoft AVI is 48000 Hz. I don't know if I should change this to 32000 or not. It makes sense to change the export default to 32000 if that's what the original AVI captures were. But these finished AVIs will be going to a person who will probably be editing them in consumer-grade software. Would it be better to export these AVIs as 48000 to avoid compatibility issues for this user?


      Thank you in advance. I'm primarily a Mac/Final Cut Pro user, and new to Premiere and AVI capture/export, so I can use all the help I can get.

        • 1. Re: How to export DV AVIs without re-encoding?
          John T Smith Adobe Community Professional & MVP

          If these files are eventually going to be used to create a DVD, you want 48khz sound


          If you do not apply any EFFECTS doing a simple cut'n'paste to create one new file out of several files should not change anything at all... except I'm not sure what will happen to the video when you change the wrong sound to 48khz sound


          So, for future reference, tell the camera operator to always use 48khz sound since that is what is used for a DVD

          • 2. Re: How to export DV AVIs without re-encoding?
            Moxie Cat Level 1

            Nope, no effects. It's really just: set in and out for clip 1, plop it on the timeline. Set in and out for clip 2, plop it on the timeline. Resave the sequence as one new AVI. That new AVI needs to be those two original captured clips joined together with no re-encoding done.


            Do you know for sure that when you export a captured DV clip using the default Microsoft AVI option (with only cutting/joining done), nothing is re-encoded after the steps listed above? I'm sorry for pressing this, but I really need to make sure about this before I hand over the finished AVIs.


            Believe me, I am there with you on 16 bit/48000 sound. In fact, Final Cut Pro is far less forgiving of 12 bit sound than Premiere! But you can't always control what someone gives you.

            • 3. Re: How to export DV AVIs without re-encoding?
              John T Smith Adobe Community Professional & MVP

              I can only say that when I cut/combine clips using CS3 there is ZERO re-encoding done and every part of the combined output is in all ways a duplicate of the various input files


              But... my source is via a dual 8mm/Vhs deck into a Pinnacle Dv500 card, so everything that makes it to my hard drive is DV AVI type 2 with 48khz sound from the get-go


              That is why I said I don't know if the video will be effected in any way when you go from 32khz to 48khz sound... I don't THINK so, but really don't know


              The best thing you can do is give it a try and then play the resulting AVI and compare it to the original(s)

              • 4. Re: How to export DV AVIs without re-encoding?
                Colin Brougham Level 6

                Premiere (or, more specifically, Adobe Media Encoder) will not reencode DV video provided it has no transformation, opacity changes, or effects applied. It will simply copy the frame from the source footage into the destination. To test this (if you're the doubting kind ), simply export a section of your sequence to DV AVI. Import that clip back into the project and place it on a track above the original section you exported. Twirl down the opacity settings in the Effect Control Panel for that clip, and set the blend mode to Difference. You'll see only black (assuming you've properly aligned the clip), which means there is no difference between the original and the exported/imported clip. You can also turn on the waveform monitor in the Program Monitor and you'll see nothing but a solid horizontal line at 0IRE.


                I'd suggest conforming everything to 48kHz. You can use the 32kHz audio in a 48kHz sequence because Premiere will conform the audio on import to 48kHz, and will actually use that for editing and export. There's no need to use a 32kHz sequence. If you want to be sure, you could always export the 32kHz audio portion of a clip to a 48kHz WAV file, import that, and replace the audio portion of the original clip where it's used in the sequence. It's going to be upsampled at one point or another (unless of course you use a 32kHz sequence and export to a 32kHz DV AVI), and I just think that using the 48kHz standard is the safer approach.