x265 HEVC Encoder

[RiCON]

I did, yes. After reading the replies here.

[LigH]

Oh, that was you.

[pingfr]

Hey guys,

Development appears to be quiet since commit ad961f5 on the 30/05... I mean sure I can see a few minor commits here and there, but they are mostly "minor fixes" such as warning silencing, clarifications, commit hash fixing, etc.

I'm wondering what would be the "next" step or what's the "direction" at the moment from the MulticoreWare team, specifically if anything in the "visual optimization" field of expertise or "compression efficiency" is either in the works or in the pipeline?

Cheers.

Originally Posted by pingfr

Hey guys,

Development appears to be quiet since commit ad961f5 on the 30/05... I mean sure I can see a few minor commits here and there, but they are mostly "minor fixes" such as warning silencing, clarifications, commit hash fixing, etc.

I'm wondering what would be the "next" step or what's the "direction" at the moment from the MulticoreWare team, specifically if anything in the "visual optimization" field of expertise or "compression efficiency" is either in the works or in the pipeline?

Cheers.

There are some optimizations to SAO in development that should be ready this month. Longer term there are a number of visual quality and performance improvements we're working on, but for now we'd prefer to keep our powder dry, so we can make a bigger bang when we have some results to show.

[pingfr]

Originally Posted by x265_Project

There are some optimizations to SAO in development that should be ready this month. Longer term there are a number of visual quality and performance improvements we're working on, but for now we'd prefer to keep our powder dry, so we can make a bigger bang when we have some results to show.

Amazing, thanks for the heads up!

[filler56789]

Originally Posted by professor_desty_nova

.....

PS: Isn't "(now it only enables B GOP structure)" on x265 help outdated

It is the same as version 0.3 when you didn't have b-adapt...

Yes$S... HEVC encoder version 1.9+215-78ffb67a844e still says the same thing.

x265 --help

[Barough]

Originally Posted by x265_Project

There are some optimizations to SAO in development that should be ready this month. Longer term there are a number of visual quality and performance improvements we're working on, but for now we'd prefer to keep our powder dry, so we can make a bigger bang when we have some results to show.

That's gr8 info/news. Thnx.

[filler56789]

Very-well, my next MinGW builds will not say:

"(now it only enables B GOP structure)"

Sometimes Wikipedia is right: be bold

[innosia]

Thanks guys for all of the efforts

I am noob here, can I ask the cli syntax to run x265 to convert mkv to mkv for smaller CRF for tune animation

[LigH]

Unfortunately, a "vanilla" build of x265 can neither read video input from an MKV directly, nor create the encoded result inside an MKV container.

You will need some helping frameserver script (usually AviSynth) to decode the video from your source MKV, using avs4x26x or similar piping helper tools, and will get a raw HEVC video stream you have to multiplex later with e.g. mkvmerge.

Your only way to achieve your desired workflow may be using ffmpeg with libx265 as video encoder. Probably something like:

ffmpeg -i input.mkv -vcodec libx265 -crf 20 -preset slow -tune animation -acodec copy output.mkv

[innosia]

Originally Posted by LigH

Unfortunately, a "vanilla" build of x265 can neither read video input from an MKV directly, nor create the encoded result inside an MKV container.

You will need some helping frameserver script (usually AviSynth) to decode the video from your source MKV, using avs4x26x or similar piping helper tools, and will get a raw HEVC video stream you have to multiplex later with e.g. mkvmerge.

Your only way to achieve your desired workflow may be using ffmpeg with libx265 as video encoder. Probably something like:

ffmpeg -i input.mkv -vcodec libx265 -crf 20 -preset slow -tune animation -acodec copy output.mkv

thanks LigH for pointing it out
will try and let you know if it works

thanks again

[innosia]

hi i found some guide
but it was 8 bit ffmpeg

can i confirm the page : https://ffmpeg.zeranoe.com/builds/ (64 bit static) has 10 bit? and how to specify for 10 bit depth?

[Ma]

Originally Posted by innosia

can i confirm the page : https://ffmpeg.zeranoe.com/builds/ (64 bit static) has 10 bit? and how to specify for 10 bit depth?

It has only 8-bit x265 stable 1.9 (outdated). You can start with 100 frames sample like this:

ffmpeg -i ../original.mkv -ss 50 -frames 100 -v error -f yuv4mpegpipe - | x265-10b --y4m - -p slow --crf 24 o.hevc

where x265-10b is current (1.9+217) 10-bit x265.

[LigH]

All libx265 options not explicitly exposed by ffmpeg have to be added in internal parameter format (not x265 CLI format) following the ffmpeg '-x265-params' parameter:

ffmpeg -i input.mkv -vcodec libx265 -crf 20 -preset slow -tune animation -x265-params output-depth=10 -acodec copy output.mkv

Possible problem: x265 does not offer a tuning "animation" yet. Without a tuning parameter it does something, let's see if it used 10 bit depth...

No. It recognizes neither "-x265-params output-depth=10" nor "-x265-params D=10" nor "-x265-params profile=main10".

BTW, I tested with an ffmpeg build created with jb-alvarado's media-autobuild_suite. It may contain multiple x265 libraries with several bit depths. But their selection does not seem to work.

[easyfab]

You can try ffmpeg with -c:v libx265 -pix_fmt yuv420p10le perhaps

[LigH]

The problem is that the mentioned parameters are not recognized:

...
[libx265 @ 000000000294d940] Unknown option: {output-depth|D|profile}.
x265 [info]: HEVC encoder version 1.9+192-aeade2e8d8688ebf
x265 [info]: build info [Windows][GCC 5.3.0][64 bit] 8bit+10bit+12bit
...

So, libx265 inside ffmpeg reports providing three bitdepth libraries, but I cannot find a recognized parameter to select one specific out of the three.

Piping Y4M from ffmpeg to x265 CLI is probably the best OS-independent way to get high bitdepth video streams. They just have to be multiplexed afterwards.
__

The suggestion by easyfab was confirmed in IRC. Testing...

OK, profile "Main 10" is selected, so this appears to be a correct suggestion. Tanks, easyfab!

[Ma]

Originally Posted by LigH

So, libx265 inside ffmpeg reports providing three bitdepth libraries

Are you sure that you are writing about Zeranoe FFmpeg Build?

[qyot27]

Originally Posted by LigH

The problem is that the mentioned parameters are not recognized:

...
[libx265 @ 000000000294d940] Unknown option: {output-depth|D|profile}.
x265 [info]: HEVC encoder version 1.9+192-aeade2e8d8688ebf
x265 [info]: build info [Windows][GCC 5.3.0][64 bit] 8bit+10bit+12bit
...

So, libx265 inside ffmpeg reports providing three bitdepth libraries, but I cannot find a recognized parameter to select one specific out of the three.

You're supposed to use -pix_fmt, because that's how FFmpeg selects the format, and when used inside FFmpeg, libx265 works in direct I/O mode - give it 8-bit, it outputs 8-bit. Give it 10-bit, it outputs 10-bit*, etc. Overriding that has to be done by the part of the toolchain that resamples formats, and that's FFmpeg, not libx265.

*So long as it's a multilib libx265, anyway.

[LigH]

Originally Posted by Ma

Are you sure that you are writing about Zeranoe FFmpeg Build?

No, as I added later:

Originally Posted by LigH

BTW, I tested with an ffmpeg build created with jb-alvarado's media-autobuild_suite. It may contain multiple x265 libraries with several bit depths.

[innosia]

Thanks all and ligh for confirming that ffmpeg+libx265 does not support converting from 8bit to 10bit (my source is 8 bit).

My only option will be below

Originally Posted by Ma

It has only 8-bit x265 stable 1.9 (outdated). You can start with 100 frames sample like this:

ffmpeg -i ../original.mkv -ss 50 -frames 100 -v error -f yuv4mpegpipe - | x265-10b --y4m - -p slow --crf 24 o.hevc

where x265-10b is current (1.9+217) 10-bit x265.

May I know
1. Where to get x265-10b.exe? I can't compile myself coz a noob here
2. How to convert o.hevc back to mkv?

Thank you