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Thread: Downloading mp3 from Youtube...

  1. #21

    Default Re: Downloading mp3 from Youtube...

    If you say you have a low speed ADSL and a tricky router, and given audio file turned to be DASH in the end, I'd have expected a notable reduction in the audio file as well, such as quality or volume loss... When I was trying with the other rig and got low volume in the files I was at a place with a relatively low speed ADSL (1 or 2 Mbits). Unless your CLI application really helped to reduce download "effort", or the sand in your loudspeakers prevented from noticing...

    Also, has Youtube always used aac/dash for audio? Was the fact of Flash Video Downloader having a mp3 option just an idea of mine? I don't remember any longer...

  2. #22
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    Default Re: Downloading mp3 from Youtube...

    Quote Originally Posted by F_style View Post
    I see, there's no mp3 in the videos.
    So, after downloading both the video and the m4a extract, as you did, did you notice any indication of quality loss by chance? Namely, low quality or volume loss in both files' audio... Remember I got lower volume when downloading on the other rig, but didn't when doing with my rig...
    Is it m4a, dash, or aac? I got confused...

    Also, tried looking if I had "man" pages for youtube-dl, cclive, or mediainfo. Nothing. Guess I'd have to install them...
    Talking about it, how are these tools? What could you say about them? Got a bit curious...

    Thanks.
    as already mentioned much earlier in the thread . . . youtube audio is encoded as stereo AAC (advanced audio codec).
    .m4a is the container that holds the audio (like .wav usually holds pcm audio) - it is not a codec.

    If you want .mp3 audio from youtube it needs to be converted from aac. If the audio quality is dropping during the re-encode then choose a higher quality encode (as per the options in video download helper) - (but also make sure you are downloading a higher bitrate option of the video - if you download a 240p or 360p option it is going to come with a more compressed audio file as well so trying to encode this to a high quality mp3 is never going to produce good results)

    However, I don't understand the problem with leaving it as aac. It is a superior codec to mp3 and well supported by almost all systems, smartphones and portable media players. Select 720p and download as .m4a audio and just use it as is.

  3. #23
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    Default Re: Downloading mp3 from Youtube...

    On 2014-09-05 06:16, F style wrote:
    >
    > If you say you have a low speed ADSL and a tricky router, and given
    > audio file turned to be DASH in the end, I'd have expected a notable
    > reduction in the audio file as well, such as quality or volume loss...
    > When I was trying with the other rig and got low volume in the files I
    > was at a place with a relatively low speed ADSL (1 or 2 Mbits). Unless
    > your CLI application really helped to reduce download "effort", or the
    > sand in your loudspeakers prevented from noticing...


    But the video I downloaded was not dash, but fixed, standard mp4 - and
    the audio is the same quality as the audio track via dash protocol.

    You can try download that audio track and we compare checksums :-?

    > Also, has Youtube always used aac/dash for audio? Was the fact of Flash
    > Video Downloader having a mp3 option just an idea of mine? I don't
    > remember any longer...


    Dash is relatively recent, I can't say since when. Maybe youtube did
    have mp3 some time ago, they do changes. And I also seem to remember
    some downloaders doing automatic conversion.

    --
    Cheers / Saludos,

    Carlos E. R.
    (from 13.1 x86_64 "Bottle" at Telcontar)

  4. #24
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    Default Re: Downloading mp3 from Youtube...

    On 2014-09-05 11:16, farcusnz wrote:
    > However, I don't understand the problem with leaving it as aac. It is a
    > superior codec to mp3 and well supported by almost all systems,
    > smartphones and portable media players.


    Only moderns ones. My two pocket ones only support mp3, and I guess my
    car system does the same: it goes via Parrot hands free system, or via
    actual CD with mp3, untested - and the car is about 1.5 year old.

    The audacity player I tried on this computer does not support it, either
    (or has a local problem). Amarok did.

    --
    Cheers / Saludos,

    Carlos E. R.
    (from 13.1 x86_64 "Bottle" at Telcontar)

  5. #25
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    Default Re: Downloading mp3 from Youtube...

    Quote Originally Posted by F_style View Post
    Strange...



    P.S.: mr Caf, your extension only downloads video, not mp3, but thanks. At least I couldn't find the option...
    Yes I know
    Then I just use pacpl on it
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    My Articles Was I any help? If yes: Click the star below

  6. #26
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    Default Re: Downloading mp3 from Youtube...

    Youtube switched to DASH when they introduced the HTML5 support - I'm still saying the best way is to use an external downloader such as Clipgrab as it properly handles the segments and does transcoding to and from multiple formats.

    It also support grabbing files straight out of the clipboard, downloading and converting them on the fly.
    .: miuku #suse @ irc.freenode.net
    :: miuku@opensuse.org

    .: h​ttps://download.opensuse.org/repositories/home:/Miuku/

  7. #27
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    Default Re: Downloading mp3 from Youtube...

    On 2014-09-06 10:16, Miuku wrote:
    >
    > Youtube switched to DASH when they introduced the HTML5 support - I'm
    > still saying the best way is to use an external downloader such as
    > Clipgrab as it properly handles the segments and does transcoding to and
    > from multiple formats.
    >
    > It also support grabbing files straight out of the clipboard,
    > downloading and converting them on the fly.


    Looking here:

    http://en.wikipedia.org/wiki/Compari...be_downloaders

    I see that it does not support "max download speed", which for me is a
    "must have". I'd have to use an external limiter like "trickle".

    Otherwise, it works, I just tried it.

    --
    Cheers / Saludos,

    Carlos E. R.
    (from 13.1 x86_64 "Bottle" at Telcontar)

  8. #28

    Default Re: Downloading mp3 from Youtube...

    So as it has been mentioned, DASH audio is relatively recent on Youtube, and it's "adaptive" depending on server-client system speed. So if I have a relatively low speed ADSL (1 or 2 Mbits), could this really make quality to be reduced when downloading with a common Firefox extension or an online website, like the mentioned ones on previous pages?

  9. #29
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    Default Re: Downloading mp3 from Youtube...

    On 2014-09-06 22:36, F style wrote:
    >
    > So as Miuku and Robin Listas mentioned, DASH audio is relatively recent
    > on Youtube, and it's "adaptive" depending on server-client system speed.
    > So if I have a relatively low speed ADSL (1 or 2 Mbits), could this
    > really make quality to be reduced when downloading with a common Firefox
    > extension or an online website, like the mentioned ones on previous
    > pages?


    Yes, of course it does. Wait... (thinking...)... Ok, most Firefox
    extensions what they do is generate or get a direct link to the file to
    download, and this is passed over to the internal Firefox downloader.
    This is the one that negotiates DASH speed and quality.

    But notice that you get a list of versions of the same file to download,
    and some are DASH, some are not. Just choose a standard one, and you
    will get the requested quality, even if takes longer to download...

    If the client program does not understand dash, there can not be
    negotiation; but the server side I think can decide changes. This I can
    not confirm, but have a look at the wikipedia article and perhaps they
    say it.

    --
    Cheers / Saludos,

    Carlos E. R.
    (from 13.1 x86_64 "Bottle" at Telcontar)

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