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Audio Quality Loss During Video Conversion

Discussion in 'Convert video to another format' started by shinta8, Feb 17, 2013.

  1. shinta8

    shinta8 Member

    Oct 7, 2008
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    Hey, I'm relatively new to audio/video conversions and want to convert or rip music videos

    I'm stingy when it comes to loss of audio quality though.

    I've read that converting one lossy audio format(e.g mp3) to another lossy format(e.g acc) will result in loss of audio quality, since they discard bits during the conversion.

    My question is what happens if i convert a music video with mp3 audio, to another video format (might be the same format, with some adjustments, or an entirely different video format) with the mp3 audio and same audio kbps as original (and all the audio settings the same as original)

    Would the video converter do something like this?
    Decode audio>uncompress it > encode audio(i think this is where more bits gets lost) > compress it

    Or that just applies from converting 1 audio format/codec to another different one?

    Would it just take the audio untouched and stick it with the new video, so no audio quality is lost?
  2. attar

    attar Senior member

    Jun 17, 2005
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    'Different format' might simply imply changing the container - perhaps AVI to MKV, then there's probably no conversion or re-encoding involved as MKV can accommodate various types of video and audio.

    If you convert mp3 to AC3, it's a change of codec, therefor re-encoding and loss.

    Editing a video for content, the audio doesn't need to be re-encoded;the cut point for the audio isn't necessarily aligned with the video cut point - although the video portion may require re-encoding depending on whether the cut was on a key frame or not.

    My opinion, FWIW, bearing in mind that I have a tin ear, is that mp3 is so compressed that only the most blatant misprocessing could affect the quality.

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