[FFmpeg-user] Lossless x264

dE . de.techno at gmail.com
Mon Jan 16 15:29:21 CET 2012

On 01/16/12 17:04, Tom Evans wrote:
> On Mon, Jan 16, 2012 at 11:14 AM, Carl Eugen Hoyos<cehoyos at ag.or.at>  wrote:
>> Please understand that it does not make sense at all to compare "close to
>> lossless" with "lossless" (one is lossless, one is not).
>> I suspect what you actually are interested in is constant quantizer.
> As I understand it, if you want high quality, but don't mind too much
> about the bitrate, you should be adjusting the crf you pass to x264,
> and use a *fast preset:
> ffmpeg -i input -c:v libx264 -preset:v superfast -x264opts crf=18
> A lower crf implies a higher quality, a slower preset implies more
> compression. For true lossless, you need to set crf=0.
> Cheers
> Tom
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Or is it -qscale (for some codecs) and qp=<0 to 50>? I think these are 
better. These are the real quality scales right?

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