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Why would an audio track cause a video glitch?

Nov 24, 2012 5:22 PM

I have a 1080 60p clip with no audio.  If I create a sequence based on that clip, add a wav file to an audio track, then export using the H.264 60p custom preset with audio multiplexing to an .m2t everything looks fine.    However, if I export using the H.264 Blu-ray preset, 720p, 59.94, multiplexed, to an .m2t file the video has some stutters towards the end.   If I remove the audio track and do the same export, still muxed, the video is fine in 720p.   I get the same result if I start with a 720p sequence (i.e. addition of audio causes video glitch).  


Edit: tried a different audio file, this time .mp3, same problem.

Edit: importing the muxed 60p export with audio, then exporting as noted in 720p has the same issue.


Comments?   Let me know if what I'm describing isn't clear.

  • Currently Being Moderated
    Nov 25, 2012 9:39 AM   in reply to joneisele

    What is the end goal here?  DVD?  Blu-ray?  Web?  Computer playback?

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  • Currently Being Moderated
    Nov 25, 2012 10:52 AM   in reply to joneisele

    in the future I will potentially be using 1080 60p footage.


    You can't put that onto Blu-ray as-is, so there's little sense in shooting that way for anything but planned slow-motion shots.


    At 1080, your frame rate options will be 30i or 24p.


    At 720, your frame rate options will be 24p or 60p.


    Plan your shoot with that in mind (and possibly reshoot the current stuff).

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  • Currently Being Moderated
    Nov 25, 2012 2:15 PM   in reply to joneisele

    Ignoring the use case though ...


    There's no point in clearing a downed tree if the road you're on is a dead end.  Best to use that time to backtrack and get yourself on the right road.  If that tree is big enough to cover both roads, then you can worry about clearing it.


    So, start off on the right road.  Match your footage and sequence to the desired Blu-ray output.

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  • Currently Being Moderated
    Nov 25, 2012 7:51 PM   in reply to joneisele

    That is weird.  But no one is likely to notice any different between 1 and 2 passes, so I'd say go ahead and use 1 pass.

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