[FFmpeg-user] Fast encoding
robinlery at gmail.com
Fri Aug 14 14:46:39 CEST 2015
Thank you for your guidance. Actual the videos that I'll be encoding are
for web video, so I think the bit rate matters. And as for the threads I
want to use all the threads possible. I think -threads 0 balance the loads
across all the cores automatically. What would be the best ffmpeg command
in your opinion for fast encoding with constant specified bit rates (i.e
500k and 1000k)?
On Thu, Aug 13, 2015 at 7:43 PM, Moritz Barsnick <barsnick at gmx.net> wrote:
> On Thu, Aug 13, 2015 at 09:03:48 -0500, Steve Boyer wrote:
> > On Wed, Aug 12, 2015 at 11:03 PM, Robin Lery <robinlery at gmail.com>
> > > I know about presets but faster presets lose the video quality. Are
> > It's my experience that CRF more directly affects the quality, and
> > presets more influence filesize and encoding speed; a preset of slow
> > will be ABOUT the same quality as veryfast but the bitrate between the
> > two would be drastically different (in my opinion and eyes).
> The presets were designed to trade off speed versus size, using the
> same CRF and thereby (approximately) the same quality. But Robin is
> > -maxrate 1000k
> thereby limiting what the encoder can achieve in terms of quality.
> > I've used -threads=1 successfully after input, before output file name.
> Did Robin want to use more threads, or less? I understand ffmpeg
> automatically tries to choose the right amount of threads.
> (That said, my libx264 claims: "Threading capabilities: no", but I read
> differing stuff on that.)
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