Configuring x265 encoder

a_nAvika · 3rd July 2015, 10:30

Hi All,

I am trying to configure x265 encoder for Random access reference structure with 7 B frame GOP (Hierarchical). But it looks like it is not possible to force a particular referencing structure in x265. Any idea how it can be done?

3rd July 2015, 17:36

See http://x265.readthedocs.org/en/defau...cision-options

--b-adapt 0 --bframes 7

a_nAvika · 9th July 2015, 06:21

Thank You.

I needed to set custom referencing structure for each frame in the GOP. Anyway I checked the code and figured out that it is not possible through CLI.

Regards.

Jamaika · 1st August 2015, 15:18

I would like to ask about the function of the pass 1/2.
I thought that encoder X265 cuts preset for pass = 1 and always is 'medium'.
However, recently draw conclusions that the pass = 1 and preset = slow / slower has other data in 'stats{log}'.
It doesn't understandable for me is the action codec.
X265 --pass 1/2 --preset slow --aq-streanch 1.0 --y4m --input-depth 10 --input-csp i422 --input-res 1920x1080 --output-depth 10 --fps 30000/1001 --bitrate 4500 --vbv-maxrate 10000 --vbv-bufsize 10000 {the figure is banding on his face}.
X265 --pass 1/2 --preset slower --aq-streanch 1.0 --y4m --input-depth 10 --input-csp i422 --input-res 1920x1080 --output-depth 10 --fps 30000/1001 --bitrate 4500 --vbv-maxrate 10000 --vbv-bufsize 10000 {the figure is lower banding on his face (in another place)}.

X265 --pass 1 --preset slower --aq-streanch 1.0 --y4m --input-depth 10 --input-csp i422 --input-res 1920x1080 --output-depth 10 --fps 30000/1001 --bitrate 4500 --vbv-maxrate 10000 --vbv-bufsize 10000
X265 --pass 2 --preset slow --aq-streanch 1.0 --y4m --input-depth 10 --input-csp i422 --input-res 1920x1080 --output-depth 10 --fps 30000/1001 --bitrate 4500 --vbv-maxrate 10000 --vbv-bufsize 10000 {banding almost disappears}

How to properly inscribe the 'preset' function?

sneaker_ger · 1st August 2015, 15:31

https://x265.readthedocs.org/en/defa...slow-firstpass

Jamaika · 1st August 2015, 15:57

I read. I don't learned a lot. Can the function pass = 1 be any preset. The program 'Hybrid' propose preset 'medium'.

sneaker_ger · 1st August 2015, 16:08

Choose the same preset for both passes, e.g.:
x265 INPUT -o OUTPUT.265 --preset slower --pass 1
x265 INPUT -o OUTPUT.265 --preset slower --pass 2

Jamaika · 1st August 2015, 16:14

Hmmm... This result isn't satisfactory for me and conversion takes too little. Thanks

3rd July 2015, 10:30	#1 \| Link
a_nAvika Registered User Join Date: Oct 2011 Posts: 5	Configuring x265 encoder Hi All, I am trying to configure x265 encoder for Random access reference structure with 7 B frame GOP (Hierarchical). But it looks like it is not possible to force a particular referencing structure in x265. Any idea how it can be done?

1st August 2015, 15:18	#4 \| Link
Jamaika Registered User Join Date: Jul 2015 Posts: 705	I would like to ask about the function of the pass 1/2. I thought that encoder X265 cuts preset for pass = 1 and always is 'medium'. However, recently draw conclusions that the pass = 1 and preset = slow / slower has other data in 'stats{log}'. It doesn't understandable for me is the action codec. X265 --pass 1/2 --preset slow --aq-streanch 1.0 --y4m --input-depth 10 --input-csp i422 --input-res 1920x1080 --output-depth 10 --fps 30000/1001 --bitrate 4500 --vbv-maxrate 10000 --vbv-bufsize 10000 {the figure is banding on his face}. X265 --pass 1/2 --preset slower --aq-streanch 1.0 --y4m --input-depth 10 --input-csp i422 --input-res 1920x1080 --output-depth 10 --fps 30000/1001 --bitrate 4500 --vbv-maxrate 10000 --vbv-bufsize 10000 {the figure is lower banding on his face (in another place)}. X265 --pass 1 --preset slower --aq-streanch 1.0 --y4m --input-depth 10 --input-csp i422 --input-res 1920x1080 --output-depth 10 --fps 30000/1001 --bitrate 4500 --vbv-maxrate 10000 --vbv-bufsize 10000 X265 --pass 2 --preset slow --aq-streanch 1.0 --y4m --input-depth 10 --input-csp i422 --input-res 1920x1080 --output-depth 10 --fps 30000/1001 --bitrate 4500 --vbv-maxrate 10000 --vbv-bufsize 10000 {banding almost disappears} How to properly inscribe the 'preset' function? Last edited by Jamaika; 1st August 2015 at 15:23.

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3rd July 2015, 17:36	#2 \| Link
x265_Project Guest Posts: n/a	See http://x265.readthedocs.org/en/defau...cision-options --b-adapt 0 --bframes 7

9th July 2015, 06:21	#3 \| Link
a_nAvika Registered User Join Date: Oct 2011 Posts: 5	Thank You. I needed to set custom referencing structure for each frame in the GOP. Anyway I checked the code and figured out that it is not possible through CLI. Regards.

1st August 2015, 15:31	#5 \| Link
sneaker_ger Registered User Join Date: Dec 2002 Posts: 5,565	https://x265.readthedocs.org/en/defa...slow-firstpass

1st August 2015, 15:57	#6 \| Link
Jamaika Registered User Join Date: Jul 2015 Posts: 705	I read. I don't learned a lot. Can the function pass = 1 be any preset. The program 'Hybrid' propose preset 'medium'.

1st August 2015, 16:08	#7 \| Link
sneaker_ger Registered User Join Date: Dec 2002 Posts: 5,565	Choose the same preset for both passes, e.g.: x265 INPUT -o OUTPUT.265 --preset slower --pass 1 x265 INPUT -o OUTPUT.265 --preset slower --pass 2

1st August 2015, 16:14	#8 \| Link
Jamaika Registered User Join Date: Jul 2015 Posts: 705	Hmmm... This result isn't satisfactory for me and conversion takes too little. Thanks