9 Replies Latest reply: Jul 11, 2012 8:13 AM by the_wine_snob RSS

    Garbled Audio in Rendered Files


      I am running Premiere Elements 9 under Windows 7 Pro 64 bit.


      Yesterday, while attempting to render a short HD video, I noticed that the audio in all files rendered as HD (1920x1080) in MPEG format, consist of a series of 4 ms bursts @ 0dB followed by 27 ms of silence - which sounds like a series of clicks.  This also happens when the same source file is rendered as a low definition file, i.e., for DVDs.  Files rendered as AVI, WMV, or MOV do not exhibit this problem. 


      Upon closer examination, I find that the audio output common to these formats is Dolby Digital.  Using an MPEG preset (NTSC DVD Widescreen) which offers another audio option (PCM), the rendered audio was perfect.  So, it would seem that the problem is related to the Dolby Digital codec.


      Has anybody else encountered this? Any suggestions for corrective action?

        • 1. Re: Garbled Audio in Rendered Files

          Hi, I suggest encoding the audio indo a different codec. You can use vlc media player for this!

          • 2. Re: Garbled Audio in Rendered Files
            Steve Grisetti MVP

            A lot also depends on your source for the original audio, and which project settings you selected when you started your Premiere Elements project.


            Other possible issues are outdated Windows 7 drivers. Go to Windows Update and ensure that all -- EVEN THE NON-CRITICAL -- updates have been downloaded and installed. (Most drivers don't download automatically.)

            • 3. Re: Garbled Audio in Rendered Files
              SoundGuy71 Community Member

              Thanks, Steve and everythingcomputers for your interest.


              In answer to the questions:


              The original audio is a 48 KHz/16 bit file created in Audition CS6 and imported into Premiere Elements (PrE).


              While it seems unlikely to be relevant, the video for this project is a series of stills running approximately 5 sec each with the only motion being whatever is introduced via transitions.  It is, in short, a nice looking slide show. 


              The project is set up for 1920x1080 30 frame/sec video, with 48 KHz audio.  Since that is also the desired output configuration, it seems that the all renderings should be fairly straight forward.


              With regard to the Windows update, the only update not installed is the Bing Desktop.


              I'll take a look at the vlc media player, but I'm starting to think that uninstalling/re-installing PrE is probably the best first step.

              • 4. Re: Garbled Audio in Rendered Files
                the_wine_snob Community Member

                Well, an Audition generated, PCM/WAV @ 48KHz 16-bit, is as good as it gets. You did Export from Au as a PCM/WAV, correct?


                I have not read of anyone encountering such distortion.


                Now, I usually Export to DD AC3, though in my case, I am using PrPro and the Minnetonka Audio SurCode DD 5.1 SS Encoder, to produce DD 5.1 SS AC3, that go into my DVD-Authoring program (Adobe Encore), for inclusion onto DVD-Video discs.


                Much of my Audio work is done in Au and other audio-editing programs. I have never experienced such problems, and cannot think of any reason, why you should.


                Good luck, and wish that I had more.



                • 5. Re: Garbled Audio in Rendered Files
                  Robert J. Johnston Community Member

                  I remember reading something about possible problems in certain applications when exporting files in Audition with embedded metadata and markers. There's an option to include or exclude that data when saving or exporting a file. You might want to try saving files in Auditon with that option turned off and see if that makes a difference in Premiere Elements. There was also something else, but I can't remember what it was.

                  • 6. Re: Garbled Audio in Rendered Files
                    SoundGuy71 Community Member



                    I tried replacing the audio file with one which did not include metadata or markers.  The results were unchanged.  Thanks.

                    • 7. Re: Garbled Audio in Rendered Files
                      SoundGuy71 Community Member

                      Thanks to all who have looked at this problem.  I haven't found a solution, but haven't given up, either.


                      I did uninstall/reinstall Premiere Elements, but that had no effect on the problem.


                      Then, it dawned on me that although the audio portion of the project doesn't begin untill 20 seconds into the piece, the clicking begins immediately upon playback.  So, I rendered the project without audio and - surprise - there was no audio on the file.  OK, so something works the way it ought to.


                      Back to work.

                      • 8. Re: Garbled Audio in Rendered Files
                        SoundGuy71 Community Member

                        Well, Folks,


                        Found it!  No, it wasn't a rendering problem.  It wasn't a problem with Premiere Elements, either.


                        I assumed that if a particular player (MS Windows Media Player, for example) would play a PCM or MP3 encoded file through a particular output, that it should also play the a Dolby Digital encoded version of that file through the same ouput.  ZZZZT.  Wrong! 


                        It appears that the audio from DD files is automatically routed differently than audio from other encoding systems.  I haven't figured out why, but would guess it might have something to do with attempts by my integrated sound card to derive 5.1/7.1 channels from the DD signal stream.  At any rate, when I route the player's output through an external sound card (TASCAM US-2000), everything is wonderful.


                        After that discovery, I checked the files rendered over the last 10 days, and they all play back perfectly.  So, again, PrE is not at fault.


                        Thanks for your efforts...and thanks to my professor who (35 years ago) tried to drill into my head the "half-split method" and who was, again, proven right.

                        • 9. Re: Garbled Audio in Rendered Files
                          the_wine_snob Community Member



                          Great news, and thank you for posting the "cause," and also your "fix" for the problem.


                          Good luck, and happy editing,