Audio Problem in Converted AVI

Discussion in 'Apple TV and Home Theater' started by ClassicBean, Sep 29, 2007.

  1. ClassicBean macrumors 6502a

    Joined:
    Jun 20, 2004
    Location:
    Torontoland
    #1
    I used VisualHub to convert an AVI file to MP4 so that I can watch it on my Apple TV (I used the Apple TV setting).

    The avi file works great. Unfortunately, the sound is off by a second or two once converted to MP4.

    Any idea why this is happening or how I can overcome this?
     
  2. FJ218700 macrumors 68000

    FJ218700

    Joined:
    Mar 8, 2007
    Location:
    Blue Dot, Red State
    #2
    how far are you sitting from the TV ? :D

    no seriously, this happens sometimes for me too. Is the sound coming before or after the correct frame?

    hopefully someone else can help in the immediate future, I've got to be away for a while.
     
  3. ClassicBean thread starter macrumors 6502a

    Joined:
    Jun 20, 2004
    Location:
    Torontoland
    #3
    I didn't even bother syncing it to the Apple TV. I just scanned through it on my Mac and noticed the audio issue. Weird that the AVI plays fine but not the MP4. It's not like I'm ripping an encrypted DVD and converted it to MP4. This is an AVI. Weird.
     
  4. FJ218700 macrumors 68000

    FJ218700

    Joined:
    Mar 8, 2007
    Location:
    Blue Dot, Red State
    #4
    What type of Mac are you on?

    On my PB 1.67 I usually don't have this problem, though the same files sometimes have the lag on my Ti Book and other G4 towers. I use iSquint and max out the settings, though I don't use H.264. Again, is it the sound or the video that is lagging to make them not in sync?
     
  5. ClassicBean thread starter macrumors 6502a

    Joined:
    Jun 20, 2004
    Location:
    Torontoland
    #5
    I'm doing this on an iMac - aluminum 2.0 GHz.

    The audio is slightly ahead of the video by about a second - maybe a second and a half.

    I did have H.264 Encoding selected. Maybe I will try it without it. I also have a MacBook Pro. I'll try it on there to see if it makes a difference.

    I should note that I've tried converting other AVI files to great success without any audio problems.
     
  6. pseybold macrumors member

    Joined:
    Oct 17, 2005
    Location:
    Atlantic City, NJ & Long Island, NY
    #6
    i have the same problem from time to time. its not lag from the computer...it actually happens in the encoding. Ive used Handbrake and elgato 264, and every once in a blue moon i get the same problem. hope someone here has some idea.
     
  7. sas76 macrumors member

    Joined:
    Sep 10, 2006
    Location:
    Australia
    #7
    Same problem using Quicktime pro

    I was just about to ask this same question.

    When I convert avi's to mp4 using quicktime pro and the apple TV settings, my audio is slightly out (just noticable) at the bigining of the movie and gets worse the longer the movie goes for.
    The sound is can be delayed by upto 5 seconds, it can be very frustrating.

    A few questions, any ideas on how to fix this ?
    Other options for converting avi's to mp4 ? that work well.
    Has anyone used other settings in quicktime that work ?

    Cheers
     
  8. Macsterling macrumors regular

    Macsterling

    Joined:
    Sep 24, 2007
    Location:
    Dallas
    #8
    I have also noticed the same problem that you guys are facing. The program I found that works is the MPEG Streamclip found under video in the Apple downloads section. You can do all custimaztions with this. Not as fast as I want but hey, I get my movies the right way.
     
  9. eddyg macrumors 6502

    Joined:
    Sep 5, 2003
    Location:
    Christchurch, New Zealand
    #9
    Sounds as if the audio frequency is wrong, so the audio and video diverge over time.

    Cheers, Ed.
     

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