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meguIV: The Official Akiba-Online DVD Encoder (v1.0.1.1)

Discussion in 'Tech Support' started by Rollyco, Jun 30, 2009.

  1. akiballion

    akiballion Member

    Did a couple of tests, demuxing the audio from the M4A container and then muxing the raw AAC stream with the video seems to result in perfect sync without delay, but I'm still not sure why it happens in the first place and if this is the right way to do it.

    Edit: The 20ms delay happens with all sources when muxing MP4 & M4A streams together & seems to stem from the way MKVToolNix handles encoder delays.
     
  2. akiballion

    akiballion Member

    Found a fix, it's pretty stupid but w/e.

    So what works is
    1.) Muxing with FFmpeg first -> this creates a file with negative audio delay, but source-accurate sync.
    2.) Throwing the MKV into MKVToolNix, removing the FFmpeg metadata and muxing again.

    The negative delay is gone, MediaInfo now reports 0ms. There also won't be any dropped frames in the beginning or programs refusing to open the file.

    Also, muxing the M4a or raw AAC stream both introduce a slight audio shift compared to the source. 20ms might seem low, but consider that lip sync already goes bad at 22ms, and delays as low as 10ms can be perceivable to some people!

    It's probably OCD territory at this point and, depending on the source, might not matter at all. It's not perceivable with anime or any stuff without lots of dialogue really, but just throwing this out there anyway.

    Worth reading up on. While it was specifically written for QAAC, it applies to other AAC encoders as well:
    https://developer.apple.com/library/archive/documentation/QuickTime/QTFF/QTFFAppenG/QTFFAppenG.html
     
  3. thelolibear

    thelolibear Loli Collector

    Is there still a working version of the encoder available? I tried many different encoders but I have lots of problems with De-interlacing, no matter what i do it looks bad. is there a real one click solution :)?
     
  4. Porni

    Porni Well-Known Member

    No.