[FFmpeg-user] Fast encoding
robinlery at gmail.com
Fri Aug 14 15:07:51 CEST 2015
Hello sir, I am sorry I am very new at this. Would you please elaborate
more, I didn't get you.
On 14 Aug 2015 18:28, "Henk D. Schoneveld" <belcampo at zonnet.nl> wrote:
> On 14 Aug 2015, at 14:46, Robin Lery <robinlery at gmail.com> wrote:
> > Hello,
> > 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
> > 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)?
> ConstantBitrate is too much or too little
> CRF/ConstantQuality is ….
> > Thank you.
> > On Thu, Aug 13, 2015 at 7:43 PM, Moritz Barsnick <barsnick at gmx.net>
> >> 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
> >> using:
> >>> -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.)
> >> Moritz
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