[FFmpeg-user] ffmpeg extremely high consumption

[En Figureo Canal]

On Thu, Jun 18, 2015 at 3:19 AM, Frans Gouverne <fransgnl at gmail.com> wrote:

> You need to specify option -re before the input file to read input as
> native frame rate. Otherwise ffmpeg will try to convert as fast as possible
> (neglecting the input frame rate), using as much as CPU power as it can
> get. As a result, you cannot view the output stream as well. So please use
> something like:
>
> ffmpeg -re -i video.mp4 [...]
>
> I have a test system with much less CPU resources as your system but my CPU
> power is not exceeding around 60%. But when I do not use option -re it goes
> up to 175%!
>
>


Thanks Frans for replying but, I'm already doing that. The only thing I
noticed used less power is using -preset ultrafast



>
>
> 2015-06-14 18:16 GMT+02:00 En Figureo Canal <figureo56.com at gmail.com>:
>
> > On Sat, Jun 13, 2015 at 10:28 PM, Pavel Koshevoy <pkoshevoy at gmail.com>
> > wrote:
> >
> > > On 6/13/15 17:49, En Figureo Canal wrote:
> > >
> > >> On Sat, Jun 13, 2015 at 8:24 PM, Moritz Barsnick <barsnick at gmx.net>
> > >> wrote:
> > >>
> > >>  On Sat, Jun 13, 2015 at 19:17:51 -0400, En Figureo Canal wrote:
> > >>>
> > >>>> Noticed that, after Henk's reply, if I use -vcodec copy then the
> > output
> > >>>> will "copy" the source video's attribute (-vb, size, etc...), but,
> if
> > I
> > >>>> really need to set the video rate (-vb) then I need to specify the
> > codec
> > >>>> needed to encode the new video.
> > >>>>
> > >>> No, it does not copy the attributes (those are very had to
> duplicate),
> > >>> it copies the stream without reencoding. You wouldn't even need
> libx264
> > >>> for that.
> > >>>
> > >>>   <http://ffmpeg.org/mailman/listinfo/ffmpeg-user>
> > >>>
> > >>>  I understand I don't need libx264 but, when I tried it like this:
> > >>
> > >> ffmpeg -i video.mp4 -vcodec copy -vb 1024k -f flv rtmp://ip/live/test
> > >>
> > >> the output rate was the original video rate at 4M
> > >>
> > >> But, if I do this:
> > >>
> > >> ffmpeg -i video.mp4 -vcodec libx264 -vb 1024k  -f flv
> > rtmp://ip/live/test
> > >>
> > >> the output rate is at 1M but video freezes.
> > >>
> > >
> > > You either need a faster computer, or a hardware accelerated encoder
> > > (nvenc if you have compatible NVIDIA card), or you can use a less
> > demanding
> > > libx264 preset -- "veryfast" might work, "ultrafast" is most likely to
> > > work.  I believe the default is "medium".  The cheapest and quickest
> > thing
> > > you can try is adding -preset ultrafast after libx264.  If you don't
> like
> > > the quality try -preset veryfast. If that fails consider using nvenc.
> > >
> > > Also, see here --
> https://trac.ffmpeg.org/wiki/EncodingForStreamingSites
> > > -- it appears to be relevant to what you are trying to do.
> > >
> > >     Pavel.
> > >
> > >
> > > _______________________________________________
> > > ffmpeg-user mailing list
> > > ffmpeg-user at ffmpeg.org
> > > http://ffmpeg.org/mailman/listinfo/ffmpeg-user
> > >
> >
> >
> > Pavel thanks for replying.
> >
> > I'm using ultrafast preset.
> > _______________________________________________
> > ffmpeg-user mailing list
> > ffmpeg-user at ffmpeg.org
> > http://ffmpeg.org/mailman/listinfo/ffmpeg-user
> >
>
>
>
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