Will crf affect encoding speed

[rhbc73]

Hi guys,

I'm using crf to control x264 output. As I know smaller crf (better quality) will increase the ouput file size. But I want to know if crf has effect on encoding speed? (I tested encoding myself, seems smaller crf encodes slower, I just need some confirm)

Thanks

[mandarinka]

Encoding gets slower with the bitrate rising (dunno if that is true with all presets, but at stuff like slow-veryslow, it certainly is true). The difference isn't anything tragic though.

[detmek]

The reason for that is CABAC. More bits, more information for CABAC to compress.

[LoRd_MuldeR]

The reason for that is CABAC. More bits, more information for CABAC to compress.

I think it's the same with CAVLC. Just CAVLC is much faster than CABAC, so the effect won't be that noticeable overall...