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audio sync problems...

  • 31-05-2005 8:53am
    #1
    decob
    Registered Users, Registered Users 2 Posts: 927 ✭✭✭


    I took some footage (c60mins) in, compressed on the fly to mpeg2. Brought it into premier pro to cut some bits from the start and end, then exported it using the adobe media encoder as mpeg2-dvd (uses the main concept codec)

    anyway, fired it into dvd maestro and compiled, problem is, when i play it there is an audio sync problem, in parts you hear the people talk before their mouth moves. Now i've tried starting the audio a few frames after the video, currently have it starting 11frames after the video, but in parts the sync problem is still noticeable yet in other parts not...

    The original mpeg file the audio is perfect and no sync problems, so hence the assumption that it is a premier problem. Now i've done this many times on shorter run 10,20, 30 mins and never had a problem like this..

    I've tried it a couple of times taking the audio as both pcm and mpeg layer 2, but still the same problem... any ideas?


Comments

  • #2
    Lump
    Registered Users, Registered Users 2 Posts: 10,984 ✭✭✭✭Lump


    I imagine it'd be a problem encoding it on the Fly. Where the Video Bit rate is increased, for shots with lots of movement/fire etc, the audio will encode faster and could lead to sync problems. For freeview, they use a MASSIVE computer to encode to Mpeg.

    Why are you compressing it to Mpeg 2?

    John


  • #3
    mycroft
    Closed Accounts Posts: 2,862 ✭✭✭mycroft


    Lump wrote:
    I imagine it'd be a problem encoding it on the Fly. Where the Video Bit rate is increased, for shots with lots of movement/fire etc, the audio will encode faster and could lead to sync problems. For freeview, they use a MASSIVE computer to encode to Mpeg.

    Why are you compressing it to Mpeg 2?

    John

    Sounds like sync drift. try encoding them as six ten minute pieces and join em together afterwards.


  • #4
    decob
    Registered Users, Registered Users 2 Posts: 927 ✭✭✭decob


    Lump wrote:
    I imagine it'd be a problem encoding it on the Fly. Where the Video Bit rate is increased, for shots with lots of movement/fire etc, the audio will encode faster and could lead to sync problems. For freeview, they use a MASSIVE computer to encode to Mpeg.

    Why are you compressing it to Mpeg 2?

    it's a digital rapids computer which is to record and encode on the fly..


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