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  1. #1
    Audio/video sync problems converting mts to mp4

    Member Since
    Jun 28, 2010
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    Smile Audio/video sync problems converting mts to mp4
    I am using Handbrake to try and convert (on my new IMAC) hundreds of .mts files to MP4. I have tried various audio and video settings on Handbrake and after conversion takes place I still end up with the audio and video not being in sync. The video quality is fine. I'd like to stick with Handbrake and am wondering if anyone has discovered the correct settings to get good quality audio and video. I am new to Handbrake and Mac so if anyone out there can offer help please offer it in simple terms. thanks and I look forward to your help.

  2. #2
    Audio/video sync problems converting mts to mp4
    Kevriano's Avatar
    Member Since
    Jul 02, 2006
    Location
    Crawley, England
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    Specs:
    20" Intel iMac 2.4 Ghz/3G Ram/320HD, Snow Leopard. PBook G4, 1.5Ghz/1.5 Ram/250 HD, Leopard 10.5.6.
    Can you post the settings you are using and I'll have a look.
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  3. #3
    Audio/video sync problems converting mts to mp4

    Member Since
    Jun 28, 2010
    Posts
    2
    Sure, Kevriano

    Here are my settings:

    On Output, I am choosing format "MP4 file".

    For Video, my settings for video codec is "MPEG-4 (FFmpeg)"; framerate is "same as source"; constant quality is moved to "100%".

    For Audio, the source is "Unknown (AC3)(2.0 ch)"; the audio codec is "AAC (faac)"; Mixdown is "stereo"; samplerate (khz) is "auto"; bitrate (kbps) is "160". DRC is "0.00".

    Some good news: On one file, all I did was change the bitrate from 160 to 128, and the video/audio synced perfectly. So, I think I found the solution. What is perplexing is no matter what I do on another (larger) file I can't get it to sync. Maybe the source for that one had a sync problem. Not sure.

    If you have any suggestions, please offer.

  4. #4
    Audio/video sync problems converting mts to mp4
    Kevriano's Avatar
    Member Since
    Jul 02, 2006
    Location
    Crawley, England
    Posts
    4,558
    Specs:
    20" Intel iMac 2.4 Ghz/3G Ram/320HD, Snow Leopard. PBook G4, 1.5Ghz/1.5 Ram/250 HD, Leopard 10.5.6.
    Ok the settings seem ok, but a shame you have to use 128 bit rate.
    I have found Handbrake to be a little lacking when it comes to audio stream extraction, and I actually do it seperately and mux the audio back into the movie after (MKV encoding here) Handbrake is also no good for adding subs.
    Just curious if you have tried audio passthrough instead of downmix?
    Try my custom Mac Forums Search Engine: Mac Forums Google Search

    Please use the reputation system if you consider any help given useful (it's the little ✓/✘ on the left <---)


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