[FFmpeg-user] ffmpeg extremely high consumption

[En Figureo Canal]

I've noticed that the cpu goes wild when I use libx264, it doesn't matter
if I reduce the quality ( -crf 30 ).

If I don't use it, then the cpu stress stays at around 90-98%.

Now, the video quality can't be compared. the libx264 compression is great
but the stream freezes while playing but, the without it is not even worth
viewing.

Now, what other options are there using libx264, if any?

Thanks for replying.

On Fri, Jun 12, 2015 at 1:17 PM, Moritz Barsnick <barsnick at gmx.net> wrote:

> On Fri, Jun 12, 2015 at 11:56:04 -0400, En Figureo Canal wrote:
> > This is the command I'm using to send the stream to nginx:
> >
> > ffmpeg -re -i video.mp4 -vcodec libx264 -crf 23 -preset medium -pix_fmt
> > yuv420p -f flv rtmp://ip/live/test
>
> (BTW, "-crf 23 -preset" is default for libx264. Not that it matters.)
>
> If you showed us the complete, uncut output, we could see what the
> specs of your streams are and whether something is wrong. This way,
> without more info, we don't even know which resolution your material
> has.
>
> > Can someone please let me know why such a high cpu consumption
>
> Show us the output, please.
>
> > or if there is another way of doing such stream with less stress on
> > cpu.
>
> Yes, you can leverage conversion speed (CPU) vs. video size (stream
> bandwidth) vs. quality.
>
> You could:
> - reduce quality (e.g. "-crf 25") and/or resolution
> - use a different preset (e.g. "-preset fast")
> and experiment with both.
> You could even copy the input stream, if its specs are sufficient. That
> reduces CPU significantly.
>
> Cheers,
> Moritz
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