[FFmpeg-user] Why is concat so slow on a powerful machine?

Carlos E. R. robin.listas at telefonica.net
Thu Oct 26 03:17:25 EEST 2017

On 2017-10-25 23:08, Kevin Duffey wrote:
>  Hey.. sorry if this top posts again.. I am not sure what that means exactly.. I am guessing it means this response shows up on top of other responses instead of the bottom. I am using email to reply though.. is there some way via email I can make it not top post? Or.. do I have to use some other web site to send posts? 

Of course you do it with email. You must put the cursor below the quoted
text, delete the excess, and start typing.

And yes, you are top posting. You are placing the cursor above the
quoted text, and you are not deleting anything!

> As for ffmpeg... just redid my system clean, everything running on NVMe in raid 0 (not that it will make much difference). I still can not understand what is causing it to go so slow. DNxHR SQ, 2 files, same as before, I cant get past 9fps. For not decoding/encoding, it is going WAY slower than Resolve does when encoding with FX. I can get about 30fps that way.  I would think that this should be hitting 100+fps or more. 
> Is there some other issue anyone may know of that limits the speed at which ffmpeg runs? I mean its using < 1% CPU. That seems odd to me too. Is there something I need to do to tell it to use more cpu? I even tried opening a CMD prompt with admin rights.. hoping that may be it. 
> Frustrated because this should be much much faster and is now causing my process to take 10+ hours for a 1 hour video. 

I understand that this also happen when you use the copy command on the
shell, so this would be a Windows issue, not an ffmpeg issue. You would
have to ask about that issue on a Windows mail list or forum.

Cheers / Saludos,

		Carlos E. R.

  (from 42.2 x86_64 "Malachite" (Minas Tirith))

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