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Old 21st November 2021, 11:41   #1  |  Link
Yog_Sothoth
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x265 (HEVC) basic encoder settings?

Hello. It's all too complicated for me. Could you just tell me what the basiс settings for encoding are?

For example:
Profile.
Level.
Preset.
Scaling mode (for downscaling).
Any other options I need to change aside from bitrate, resolution, rate control mode? As I understand, 2-pass encoding is better, but people still use constant quality one, why?
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Old 21st November 2021, 12:26   #2  |  Link
Atak_Snajpera
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Because nobody aims for CD/dvd anymore. 2-pass is a waste of time and space
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Old 21st November 2021, 19:59   #3  |  Link
RanmaCanada
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Just pick a CRF and a speed, and you're good to go. The baseline of the speed profiles does a "good" job of getting you decent quality without massive tweaking. Slow or lower is better.
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Old 22nd November 2021, 11:18   #4  |  Link
Yog_Sothoth
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Quote:
Originally Posted by RanmaCanada View Post
Just pick a CRF and a speed, and you're good to go. The baseline of the speed profiles does a "good" job of getting you decent quality without massive tweaking. Slow or lower is better.
For which bitrates hevc performs better compared to avc? I've tested them on 6 Mb/s and I think they are pretty similar, but avc is slightly better (if you zoom in and take a closer look). Is that correct, I thought it shouldn't be the case? I've also tried higher and lower bitrates and at all them, they perform pretty similar, but at around 3 Mb - hevc certainly wins, and at 12 Mb - avc slightly wins. So, where is that threshold between bitrates for hevc and bitrates for avc?
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Old 23rd November 2021, 02:42   #5  |  Link
RanmaCanada
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Quote:
Originally Posted by Yog_Sothoth View Post
For which bitrates hevc performs better compared to avc? I've tested them on 6 Mb/s and I think they are pretty similar, but avc is slightly better (if you zoom in and take a closer look). Is that correct, I thought it shouldn't be the case? I've also tried higher and lower bitrates and at all them, they perform pretty similar, but at around 3 Mb - hevc certainly wins, and at 12 Mb - avc slightly wins. So, where is that threshold between bitrates for hevc and bitrates for avc?
It all depends on the source material. But if my answer is not good enough, I am sure one of the more knowledgeable users will chime in.
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Old 23rd November 2021, 03:55   #6  |  Link
videoh
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Originally Posted by RanmaCanada View Post
I am sure one of the more knowledgeable users will chime in.
You seem pretty knowledgeable to me. Believe.

@all

Happy Thanksgiving!
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Old 29th November 2021, 21:19   #7  |  Link
benwaggoner
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Quote:
Originally Posted by Yog_Sothoth View Post
For which bitrates hevc performs better compared to avc? I've tested them on 6 Mb/s and I think they are pretty similar, but avc is slightly better (if you zoom in and take a closer look). Is that correct, I thought it shouldn't be the case? I've also tried higher and lower bitrates and at all them, they perform pretty similar, but at around 3 Mb - hevc certainly wins, and at 12 Mb - avc slightly wins. So, where is that threshold between bitrates for hevc and bitrates for avc?
HEVC generally takes around 50-70% the bitrate to hit the same quality as H.264 at the same presets (so x265 slower than x264). High enough and bitrate and quality will converge. Best comparisons are with H.264 at the lowest bitrate that achieves a subjective quality target.

Comparing with 2-pass VBR is better than just CRF, as CRF values aren't equivalent across codecs or content types.
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