7 Replies Latest reply on May 22, 2009 1:55 PM by Jim_Simon

    CS4 AC3 Audio problems

    Phil'68 Level 1

      After editing AVCHD material  with Premiere CS4 and export it as a Bluray-MPEG file (*.m2t) in Dolby-Stereo I can playback the file in extern video players as PowerDVD or Arcsoft Mediatheater 3 without any problems. But if import it in Encore CS4 I have no sound anymore. Even if I re-import the file into Premiere CS4 for changing audio codec (i.e pcm stereo) there is no sound playback in Premiere either.

      Can anybody help? Do I have to reinstall CS4 because of loosing any codecs?


      My system:

      Intel CPU Core2 Quad Q9550

      8GB RAM 1066Mhz

      Asus P5Q Pro

      Onboard Realtek HD Audio

      Raid10 with 4 Samsung 1TB

      Vista64 Home Premium


      Thanks for help


        • 1. Re: CS4 AC3 Audio problems
          Eddie Lotter Level 4

          Welcome to the forums.

          Why re-import highly compressed media? Go back to the original and export with the codec you really want.

          If you have no other choice then demux the .M2T file into separate video and audio files and import those into PPro.


          • 2. Re: CS4 AC3 Audio problems
            the_wine_snob Level 9



            Are you using the DL (Adobe Dynamic Link) to get your PrPro Project into Encore, or are you Exporting from PrPro and then Importing that file into Encore?


            If the latter, then Export as elemental streams, i.e. Video-only in one file, and Audio-only in the other. In Encore, Import the Video-only file as a Timeline, and the Audio-only file as an Asset. From the Project Panel (in Encore), drag the Audio file to the appropriate Timeline. Encore often has trouble with muxed files (Audio & Video multiplexed).


            If the former, Encore should see your Sequence(s) and you do not need to Export/Import anything.


            Good luck,



            • 3. Re: CS4 AC3 Audio problems
              Phil'68 Level 1

              Thanks for help, Eddie and Hunt. The problem I exactely have is that I edited some AVCHD-material and exported it as about eight .m2t files each of about 10minutes duration. Now I want to build a Bluray disc in Encore with these eight .m2t-files. But Encore doesn't play any sound (so I think the Bluray disc won't have any sound either, will it?). Because I deleted the original AVCHD files I can't edit the whole project once again (what I don't want anyway). So my idea was to re-import it to Premiere to change the audio file (from Dolby to PCM - to see if this audio file would be playbacked in Encore?) But even Premiere does not play the audio file of the m2t-file. But the external programs as Arcsoft Mediatheater 3 play the files correctly, so the audio of the m2t must be o.k.  I think it is a problem of my CS4, isn't it?

              Hope I made it a bit clearer (sorry my English is not that great...).


              • 4. Re: CS4 AC3 Audio problems
                the_wine_snob Level 9



                The English is great - no worries there.


                OK, you have the muxed m2t files. For some reason, neither Encore of PrPro (the parent program of these files) will play the AC3 component.


                Ann Bens has mentioned the AC3 Filter (maybe in another thread). Have you tried it. If has worked for some, though a few had to resort to other means.


                Another tack, since you cannot Open your old Project, without the source media files, would be to de-mux one of the m2t files. This would give you the two "elemental streams," an m2v (Video) and the AC3 file. Try the old "manual" way of Importing those into an Encore BD Project. Unfortunately, I have zero experience with de-muxing HD material, so have no recs. on programs to use/try. Others can probably step in and help you here.


                There have also been several threads on CS4 and AC3 material. Unfortunately, most came before the forum changeover, so seaching for them might be a bit tedious. There might be some easy fixes in those slightly older threads.


                Though the number of BD authoring programs is still a bit slim, maybe one of them would do a better job with your muxed file, than would Encore. Might be worth looking into doing a trial of some, and testing. Again, as I do not do BD yet, I don't have any recommendations on which programs you should even consider.


                Good luck, and please post back with your findings,



                • 5. Re: CS4 AC3 Audio problems
                  Ann Bens Adobe Community Professional & MVP

                  My guess here is version 4.0.1. giving the trouble.

                  Exporting to DD.

                  • 6. Re: CS4 AC3 Audio problems
                    the_wine_snob Level 9



                    You're probably on to something there. IIRC, there WAS an issue with one of the updates, "breaking" something with regards to AC3. I had forgotten about that.





                    • 7. Re: CS4 AC3 Audio problems
                      Jim_Simon Level 8
                      Because I deleted the original AVCHD files


                      Lesson learned there, huh?


                      Just NEVER do something like that.  ALWAYS keep original media on a shelf somewhere - via hard drive, data disk, video tape, whatever - along with the project file and everything else you'll need to rebuild if you ever need to.