[FFmpeg-user] Download audio only bytes with ffmpeg

[Feras Salim]

Thanks a lot for the information. Thats what I though originally but this
software:
http://www.mediahuman.com/youtube-to-mp3-converter/
Especially if you look at the feature "Saves you time and badwidth", uses
ffmpeg as well so I was assuming the guys figures out some way of doing it.


On Fri, Oct 25, 2013 at 4:48 AM, Tom Evans <tevans.uk at googlemail.com> wrote:

> On Thu, Oct 24, 2013 at 5:42 PM, Feras Salim <feribg at gmail.com> wrote:
> > Hi,
> > I noticed a few youtube downloaders out there give the option of
> > downloading only the audio and skipping the video stream. I was wondering
> > if that is possible with ffmpeg.
>
> Yes
>
> > Given we have an url that has flv or mp4
> > source and is seekable, is it possible to download only the audio form it
> > and convert to mp3, without having to download the whole file first.
>
> No. Audio and video packets are typically interweaved with each other,
> to split out the audio you need to demux the entire file. The "youtube
> downloaders" are also downloading the whole file.
>
> > I tried the following commands but all of them resulted in using the
> > bandwidth to download the entire video:
> >
> > ffmpeg -i "url" output.mp3
> > ffmpeg -i "url" -vn -c:a copy output.mp3
> > ffmpeg –i video.flv –vn –c:a libaac –ar 44100 –ac 2 –ab 64k audio.mp3
> > ffmpeg -i video.flv -ab 160k -ac 2 -ar 44100 -vn audio.mp3
> > ffmpeg -i “input” -vn -acodec copy output.mp3
> > ffmpeg -i "input" -vn out.mp3
> >
> > Is doing something like that even possible?
> > _______________________________________________
> > ffmpeg-user mailing list
> > ffmpeg-user at ffmpeg.org
> > http://ffmpeg.org/mailman/listinfo/ffmpeg-user
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>