How-to: Fixing MKV Audio Problems in Rockplayer

Discussion in 'Android Applications Discussions' started by Bloodred, Sep 18, 2010.

  1. Bloodred

    Bloodred New Member

    Sep 18, 2010
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    So today I wanted to try playing some MKV video files in Rockplayer, only to find out the audio wasn't working right (either distorted or no audio at all). After doing a little research, it turns out there are 2 primary reasons for this:

    1) The audio component of the MKV file is surround sound, for example a 5.1 surround AAC file. (this caused distorted audio when opening in Rockplayer)
    2) The MKV file is set up for dual audio, as commonly used for anime and other english dubbed shows. (this caused no audio at all when opening in Rockplayer)

    Now that I knew the problem, I wanted to find a solution. Unfortunately it's not easy due to the complexity of MKV. Converting the MKV to another file format won't work, since it will still have the offending audio track embedded. So, what you have to do is remove or re-encode the problematic audio track(s). Here's how I did it:

    What you'll need:

    MKVtoolnix: MKVtoolnix 4.3.0

    MKV Extract GUI (extract into SAME FOLDER as MKVtoolnix): MKVExtractGUI

    Mediacoder Audio Edition: MediaCoder Audio Edition

    Mediainfo (if you don't know your video's framerate already): MediaInfo

    The Process:

    1) Open MKV Extract GUI in your MKVtoolnix folder (mkvextractgui.exe)

    • Click the checkbox next to the video track and *ONE* audio track for each MKV file
    • Note: if the MKV has embedded subtitles (software subs) you can choose to extract them as well.
      • In order for Rockplayer to read the subs, they must be .SRT format, the same name as the corresponding video file, and in the same folder as the video file.
      • if they aren't working later, check that your "Show Subtitle" option is on in Rockplayer settings.
    2) Open Mediacoder Audio Tool

    • Drag & drop in all extracted audio tracks from step 1
    • Shift-click to select all files in the list
    • Set left "Audio" tab to:
      • Encoder: CT AAC+
      • Channel: Stereo
      • Gain: 6 dB (necessary when going from 5.1 to 2.1)
    • Set right "CT AAC+" tab to:
      • Bitrate: 137 KBps
      • Mode: Stereo
    • Hit "start" button to begin transcoding

    3) Open Mediainfo, open one of the extracted video tracks, & copy FPS number (usually 23.976 in my experience)

    4) Open MKV Merge (mmg.exe in your MKVtoolnix folder)

    • One pair at a time, drag & drop in the extracted video track and the *NEW* audio track ("transcoded" will be at the end of the filename by default)
      • Click on the video track, then click "Format specific options" tab
        • paste in the FPS number copied earlier
      • Select output folder
    • Click "Start muxing" button
    • Once the file is muxed, click "remove all" before adding more files.
    • Skip through the first finished file in a media player to see if the video & audio synced properly. If not, the FPS was entered wrong during step 4. Start over from step 3.
    • If the audio is synced properly, repeat for each audio/video track pair from step 2.
    5) Copy the files onto your SD card, open with Rockplayer, and enjoy!dancedroid
    If anyone has an easier way of doing this, I'm all ears. I searched for hours and couldn't find an easier way.
  2. timrock

    timrock Member

    Aug 21, 2010
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    i convert mkv's all the time using handbrake to mp4 format, and never have an issue with the audio. The audio stays in sync. I use Rockplayer as well. Act 1 gave me issues with the audio being out of sync, but never had this problem with Rockplayer. Try handbrake and use to ipod/itouch preset. It will save you a lot of time.
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