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lbresnahan
Participating Frequently
October 12, 2010
Question

Video faster than audio when use Adobe Media Encoder to convert f4v to mp4

  • October 12, 2010
  • 1 reply
  • 2787 views

I am using Adobe Captivate 5 on a  mac record a demonstration, and I have published my project to .f4v. Now I am using Adobe Media encoder to convert the .f4v file to .mp4 (to play on an ipod). The output LOOKS good, but the video is running much faster than the audio. To be clear, the audio is running at the correct pace, but the video is going by much too quickly.

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1 reply

dannyhouk
dannyhouk
Inspiring
October 13, 2010

Having used Adobe Media Encoder a bit, this is just a shot in the dark but have you done some trial and error testing with the Frame Rate [fps] or the Key Frame Distance? Those are two settings in particular that could affect the video playback speed, primarily the fps.

I wonder if the fps of your Captivate-exported project should match that of the mp4 video? You can double-check it in Captivate from the Publish > Preferences > Publish Settings > Frames Per Second. I often try to go with 12 fps on my Captivate projects for a more svelt file size, so what about making this match your fps setting in AME?

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lbresnahanAuthor
Participating Frequently
October 14, 2010

From Captivate, I tried changing the fps to a variety of speeds (12, 20, 30, 40, 60) when publishing to f4v. Then in Adobe Media Encoder, when I converted to mp4, I tried keeping the fps the same as the source f4v, reducing it, or increasing it.  After all these experiments, I found that changing the fps in Adobe Media Encoder had no effect at all. Only changing the fps in the source f4v had an effect.  Reducing it to 12 made the probelm worse (the video went by even faster), and increasing it as high as 60 made a SLIGHT improvement, but not enough to get things in sync. Changing the key frame distance in AME had no effect.

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lbresnahanAuthor
Participating Frequently
October 14, 2010

Okay, I figured it out... I just noticed that there is another publish output from captivate.  I was using plain old “f4v video,”  but there is another choice below it: “fv4 with fixed frame rate.”  It seems to work much better with that setting -- audio & video are in sync after conversion to mp4 using Adobe Media Encoder.

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