9 Replies Latest reply on Jun 29, 2009 7:56 AM by the_wine_snob

    WMA-Audio causes framedrops

    marc.bosch Level 1

      Hi all,

       

      perhaps somebody has a solution for this:

       

      When I put in audio with an wma-file and render the file - the video-stream gets framedrops/ framejumps.
      I pulled-out wma-audio at 33 seconds no more video-stream glitches. at 6min 16 seconds I let wma-audio in and frames keep jumping ar
      ound.
      http://vimeo.com/5358609

      password: wma

      Operating System: Windows Vista
      Browser: Microsoft IE
      Video capture card / driver: 186.18
      Has it ever worked? If so, what's changed? (provide comments in description field): Yes
      Same results with different file?: No
      Same results with different computer?: No
      Recent System Hardware or Software change?: No

       

      Regards,

      Marc

        • 1. Re: WMA-Audio causes framedrops
          Steve Grisetti-JFIrXo Adobe Community Professional & MVP

          I could barely get the video to play, Marc. And the audio was so muddy, I couldn't tell if it was out of sync or not.

           

          What is your source for this video? What type of camcorder is it coming from?

           

          And what file format and settings are you outputting it as?

          • 2. Re: WMA-Audio causes framedrops
            marc.bosch Level 1

            Hi Steve,

             

            thanks for helping again. :-)

            to answer your questions:

             

            1. I could barely get the video to play, Marc

            Answer: works fine on 3 computers of mine - can also provide you the file (4MB):

             

            2. And the audio was so muddy, I couldn't tell if it was out of sync or not.

            Answer: Audio is always fine - video is the problem

             

            3. What is your source for this video?

            Answer: Source is wmv-file, 176*144 - can also upload HD-file - doesn't make any difference though.

            Video without (i deleted it) wma-file parallel (beginning of the video) video is fine

            Video with mp3-file parallel (around 2min 17sec) video is fine

            Video with wma-file parallel (at 6min 16 sec) - video-frames keep jumping around

             

            4. What type of camcorder is it coming from?

            Answer: Different consumer tape-cams and Sanyo 720p Cam

             

            5. And what file format and settings are you outputting it as?

            The file I uploaded was wmv

            I also tried quicktime - same result

            • 3. Re: WMA-Audio causes framedrops
              Steve Grisetti-JFIrXo Adobe Community Professional & MVP

              It think the problem is related to the video source and the project settings you're using. Although, without knowing if this is HDV or AVCHD video and if you're using the appropriate project settings for that source, it's hard to say.

               

              Hope you find a solution.

              • 4. Re: WMA-Audio causes framedrops
                marc.bosch Level 1

                Hi Steve,

                 

                the video-source for the helicoper-shots:

                720x576

                25 fps

                WMV

                3072 kBit/ sec data rate

                3264 kBit/sec full bitrate

                 

                the video-source for all other shots:

                1280x720

                29 fps

                WMV

                8949 kBit/sec data rate

                9080 kBit/sec full bitrate

                 

                Audio-file "Rage - Straight to Hell":

                Windows Media Audio

                192 kBit/sec

                 

                Project settings:

                HDV 720p

                Timebase: 25 fps

                Frame: 1280x720 16:9

                25 fps-timecode

                Audio Samplerate: 48000 Hz

                 

                I think through my testing I was able to find out what causes the problem:

                When I take a wma file at the position 06 min 12 sec - the video jumps around when rendered (not in preview)

                When I take a mp3-file at the same position it doesn't.

                 

                Regards,

                Marc

                • 5. Re: WMA-Audio causes framedrops
                  Steve Grisetti-JFIrXo Adobe Community Professional & MVP

                  I would not recommend using the HDV project settings when you are using WMVs as source files.

                   

                  In fact, since your video is for Vimeo, there's no point in working in hi-def at all. I'd recommend you use the standard DV settings.

                   

                  Even better if you use DV-AVIs as your source files rather than WMVs. The FAQs to the right of this forum tell you how to convert the files.

                  http://forums.adobe.com/thread/415317?tstart=0

                   

                  This will give you a boost in performance all around and will likely resolve virtually all of your problems.

                   

                  Also, have you tried converting your WMA audio to MP3 or WAV to see if that makes a difference?

                  • 6. Re: WMA-Audio causes framedrops
                    marc.bosch Level 1

                    The video will not be for vimeo - I just uploaded it for showing the problem.

                    I am aiming for 720p/25fps

                     

                    My source files are all wmv at the moment.

                     

                    When I reconvert wma to mp3 the problem is solved - but still my audio-database is wma mostly.

                    Still wma is a supported file format and therefore I now have problems I'd like to solve :-)

                    • 7. Re: WMA-Audio causes framedrops
                      Steve Grisetti-JFIrXo Adobe Community Professional & MVP

                      I still don't think WMVs are the best source for a project using HDV settings. It's likely to cause interlacing issues.

                       

                      It's interesting that converting the WMA solves your problem. This could be getting to the root of your problem -- particularly if the WMA is a purchased file. This could indicate that some sort of digital rights management could be causing you problems.

                       

                      Is this the case, or is this file ripped from a CD?

                      • 8. Re: WMA-Audio causes framedrops
                        marc.bosch Level 1

                        It's ripped from the original CD - so no DRM or anything like it.

                         

                        Regards,

                        Marc

                         

                        P.S.: I accidently pushed the "aswered" button - can I undo this?

                        • 9. Re: WMA-Audio causes framedrops
                          the_wine_snob Level 9

                          If you are ripping from an Audio-CD, you would be best to use PCM/WAV. The material is at 44.1KHz 16-bit, but in the ripping process, I'd go to 48KHz 16-bit for all Audio, that you intend to use in an NLE for Video work. This will save the conforming stage in the NLE.

                           

                          Is there some compelling reason for going to WMA? Maybe I'm missing something here. I only use WMA, where I need to work with multi-channel source files, though I most often encode these with either the SurCode DD 5.1 SS plug-in, or work with six discrete PCM/WAV files. WMA's can allow transport of the six channels in one file, but I nearly always opt to keep them separate.

                           

                          Good luck,

                           

                          Hunt