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  1. I have a video that was originally 23.976fps, but sped up to 25fps, including the audio. I can slowdown the video just fine, but I can't seem to slowdown the AAC audio.

    eac3to requires some Nero plugins I don't have and have no idea how to get those. I could make a WAV with faad and then slow it down, but I still can't output a AAC file (AC3 will work). Also it might reduce the quality.
    Audacity isn't an option either, because it casues background (white?) noice. Switching between WASAPI/MME/etc. doesn't work

    Is there another way to slow the audio down (pitch+speed) while re-encoding as little as possible (AAC->AAC instead of AAC->WAV->AAC)?
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    Originally Posted by pub View Post
    I have a video that was originally 23.976fps, but sped up to 25fps,
    Are you sure it was not simply sped up from 24p?
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  3. nero aac codec is a free download. Although nero took it down from their site, many websites - even this one - still have it available to download


    Is there another way to slow the audio down (pitch+speed) while re-encoding as little as possible (AAC->AAC instead of AAC->WAV->AAC)?
    This is exactly the same operation. You're not losing anything extra. When you go AAC => AAC, there is a WAV step in between. You might not see or be exposed to what is happening depending on what program you are using, but it is occurring in the background. Compressed audio has to be decoded (decompressed) before re-compression. The same is true for compressed video (it has to be decoded as well)
    Last edited by poisondeathray; 20th Mar 2015 at 17:25.
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  4. Originally Posted by newpball View Post
    Originally Posted by pub View Post
    I have a video that was originally 23.976fps, but sped up to 25fps,
    Are you sure it was not simply sped up from 24p?
    Yes, I'm sure

    Originally Posted by poisondeathray View Post
    nero aac codec is a free download. Although nero took it down from their site, many websites - even this one - still have it available to download


    Is there another way to slow the audio down (pitch+speed) while re-encoding as little as possible (AAC->AAC instead of AAC->WAV->AAC)?
    This is exactly the same operation. You're not losing anything extra. When you go AAC => AAC, there is a WAV step in between. You might not see or be exposed to what is happening depending on what program you are using, but it is occurring in the background. Compressed audio has to be decoded (decompressed) before re-compression. The same is true for compressed video (it has to be decoded as well)
    I've put the neroAacDec.exe, neroAacEnc.exe and neroAacTag.exe in the same folder as eac3to, but I'm getting these errors:

    Code:
    G:\eac3to>eac3to a.aac an.m4a -slowdown
    AAC, 2.0 channels, 48kHz
    Decoding with DirectShow (Nero Audio Decoder 2)...
    Getting "Nero Audio Decoder 2" instance failed.
    Aborted at file position 262144.
    
    G:\eac3to>eac3to a.aac an.m4a -slowdown -nero
    AAC, 2.0 channels, 48kHz
    I'd like to use the Nero decoder, but it doesn't seem to work.
    Using .aac instead of m4a doesn't work either.
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  5. While the Nero AAC encoder is free, the decoder is not, and you don't have it installed. You can force a eac3to to use free decoder like libav . There is no problem decoding AAC with libav .

    -libav
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  6. Originally Posted by poisondeathray View Post
    While the Nero AAC encoder is free, the decoder is not, and you don't have it installed. You can force a eac3to to use free decoder like libav . There is no problem decoding AAC with libav .

    -libav
    I now get this error:
    Code:
    G:\eac3to>eac3to a.aac an.m4a -slowdown -libav
    AAC, 2.0 channels, 48kHz
    Unfortunately libav doesn't contain an (LGPL) AAC decoder.
    Changing aac to m4a or every variation on that doesn't work either.
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  7. I guess you need the nero decoder installed for eac3to

    Another option is to use megui, which has presets for slowdown/speedup . You have the option to use neroaac, or qaac (arguably better)
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  8. It worked with MeGUI and qaac, thanks!
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