6 Replies Latest reply: Nov 16, 2012 2:19 PM by seiurus RSS

    Timeline audio cut short

    seiurus Community Member

      If I import a clip containing audio and video, and place it on a timeline, the audio seems to be cut off at about 90%.  The video is all on the timeline and plays well.  The audio is there too, not compressed but shortened. In other words it just cuts off 90% of the way through the clip.  The blue bar is also cut off.  Strangely, when I slide the asset to the timeline, and hover over it, both the video and audio blue bars are equal.  Only after the clip is entered on the timeline is the audio short.  Wierd.  Can anyone explain this?

        • 1. Re: Timeline audio cut short
          John T Smith CommunityMVP

          See if this helps http://forums.adobe.com/thread/726693

           

          Also, what KIND of file are you using?

           

          A screen shot works well to SHOW people what you are doing

          http://forums.adobe.com/thread/592070?tstart=30

          • 2. Re: Timeline audio cut short
            SAFEHARBOR11 Community Member

            Saw a similar posting the other day and the issue turned out to be that the source clip was a multiplexed .mpeg clip. Ideally, you want the audio clip separate from the video, so typically an .m2v video and .wav audio file. Please let us know the workflow you are using

             

            Thanks

             

            Jeff Pulera

            Safe Harbor Computers

            • 3. Re: Timeline audio cut short
              seiurus Community Member

              Yes, it's true. I have exactly an mpeg multiplexed clip, but isn't that what you want, to avoid having to fiddle around with audio sync, etc? Separating the audio and video does work, but seems kind of "primitive".

               

               

              Steve Siegel

              mobile (305)343-2179

              answering service 24/7 (305)865-9861

              • 4. Re: Timeline audio cut short
                John T Smith CommunityMVP

                You export out of PPro as MPEG2 DVD - note the DVD part!

                 

                That creates what Encore wants... a video file and associated audio file

                 

                When you give Encore a MUXED file, with video and audio in the same file, Encore must DE-mux to have two separate data streams... and Encore sometimes "struggles" with that

                 

                Do as Jeff said, export from PPro to MPEG2 DVD, and try again

                • 5. Re: Timeline audio cut short
                  SAFEHARBOR11 Community Member

                  Hi Steve,

                   

                  By default, Encore is set up to take your .wav file and convert, or "transcode", to Dolby AC-3. Therefore, you don't want your audio pre-compressed and mixed with the video. Give Encore the .m2v video clip, and that is ready for disc and will not be transcoded any further, and the uncompressed, high-quality .wav audio gets turned into Dolby, and everyone is happy ;-)

                   

                  As John pointed out, you are creating extra work for Encore by feeding it a muxed file, since it has to pull apart the (already compressed) audio and video, and then re-compress the audio AGAIN, so losing quality there as well as increasing build time.

                   

                  Nothing primitive about it, you're providing Encore with a "ready to go" video clip and a "ready to transcode, high quality uncompressed" audio source. Note that if you have Adobe Media Encoder CS6, look under the AUDIO tab and you will find a "Dolby" option and can in that case export the .ac3 file right along with the .m2v and then they are BOTH ready for Encore, no transcoding then in Encore.

                   

                  Regarding sync, if you output the Premiere sequence as MPEG-2 video, and there is no corruption/glitch in the file (there should never be), and you do the same for the audio, they will ALWAYS sync perfectly. These are DIGITAL files we are talkng about. Unless your software is broken, no worries, it is designed to work this way. Heck, sometimes I export an .avi from Premiere and encode to MPEG-2 using 3rd-party freeware (with no audio) and then I just export a straight .wav out of Premiere and marry the two files together in Encore...no prob!

                   

                  Jeff Pulera

                  Safe Harbor Computers

                  • 6. Re: Timeline audio cut short
                    seiurus Community Member

                    Jeff,

                          Thanks for a concise, understandible and accurate explanation.

                     

                    Steve

                     

                    Steve Siegel

                    mobile (305)343-2179

                    answering service 24/7 (305)865-9861