[FFmpeg-user] Fast encoding

Moritz Barsnick barsnick at gmx.net
Thu Aug 13 16:13:10 CEST 2015

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> wrote:
> > I know about presets but faster presets lose the video quality. Are there
> 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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