H264 manual preset/quality

[anijatsu]

As per i.e. https://trac.ffmpeg.org/wiki/Encode/H.264 – is it possible to change the preset or CRF for the libx264 encoder, built using the KB below?

https://www.nomachine.com/AR09M00863

I’d like to check whether in a low-CPU host usage scenario I can’t achieve better visual quality at the same bitrate, as I have noticed that usually only 5-10% of my CPU is being used.

[fra81]

Hi.

When the highest Display quality is set for the session, NoMachine is already cofigured to target the best quality possible.
Changing encoder presets would not affect quality, but only the ratio between encoding time (CPU usage, but also responsiveness) and video frames size (bitrate).

[anijatsu]

Hi,

Increasing allowed CPU usage is what I’d be aiming for. As of right now I get roughly a 5-12 Mbps stream at full HD depending on what’s the displayed content, but I believe this could be lowered down if there was an option to dedicate more resources to encoding.

[anijatsu]

As I understand there’s no way to do that – that’s a shame, but I’ll deal with it.

Though I’m still hoping someone will include it as a feature request 🙂

[fra81]

Yes, there is no way at the moment, but indeed that could be useful in some specific cases. We will evaluate if this is possible to achieve with used codecs without breaking in any way NoMachine’s sophisticated algorythms, and possibly in a way that is consistent across all codecs. In case, a feature request will be opened.

Thanks for the suggestion.

[Author]

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