Google VP9 "Next Generation Open Video" information posted

[Clare]

Originally Posted by Neavrie

@Clare
Try this:

ffmpeg -y -i in.y4m -c:v libvpx-vp9 -b:v 0 -crf 20 -quality good -threads 8 -cpu-used 2 -tile-columns 4 -arnr-maxframes 7 -arnr-strength 5 -an out.webm
vpxenc --good -p 1 --threads=8 --cpu-used=2 --tile-columns=4 --end-usage=q --cq-level=20 -o out.webm in.y4m

or this:

ffmpeg -y -i in.y4m -c:v libvpx-vp9 -b:v 0 -crf 20 -quality good -threads 8 -cpu-used 2 -tile-columns 4 -arnr-maxframes 7 -arnr-strength 5 -an -pass 1 -f null -
ffmpeg -y -i in.y4m -c:v libvpx-vp9 -b:v 0 -crf 20 -quality good -threads 8 -cpu-used 2 -tile-columns 4 -arnr-maxframes 7 -arnr-strength 5 -an -pass 2 out.webm

vpxenc --good -p 2 --threads=8 --cpu-used=2 --tile-columns=4 --end-usage=q --cq-level=20 -o out.webm in.y4m

I tried that but it doesn't account for the large difference in size.

[Neavrie]

@Clare
vpxenc uses 2-pass mode by default. That's why you get difference in file size.

[Clare]

Originally Posted by Neavrie

@Clare
vpxenc uses 2-pass mode by default. That's why you get difference in file size.

Huh you're right! I didn't think a two-pass encode would bring such a huge difference in file size. Now I get the exact same metrics for both FFMPEG and vpxenc.

Thanks a lot.

[Jamaika]

@Clare
For pass one is 600kb difference in 100 frames 4K.
For pass two isn't difference between the file size(~100kb). This is puzzling, but it is worth knowing. So, I understand that the tests should only do to pass two, because otherwise there is no sense.
The correct command is:

ffmpeg.exe -loglevel trace -y -i iphone6s_4k.yuv -c:v libvpx-vp9 -b:v 0 -passlogfile vp9.log -crf 20 -quality good -threads 4 -cpu-used 2 -tile-columns 4 -arnr-maxframes 7 -arnr-type 3 -arnr-strength 5 -pass 1 -an out1a.ivf
ffmpeg.exe -loglevel trace -y -i iphone6s_4k.yuv -c:v libvpx-vp9 -b:v 0 -passlogfile vp9.log -crf 20 -quality good -threads 4 -cpu-used 2 -tile-columns 4 -arnr-maxframes 7 -arnr-type 3 -arnr-strength 5 -pass 2 -an out1b.ivf
vpxenc.exe -v --ivf --good --passes=2 --pass=1 --fpf=vp9.pass --threads=4 --target-bitrate=256 --cpu-used=2 --tile-columns=4 --end-usage=q --cq-level=20 --arnr-maxframes=7 --arnr-type=3 --arnr-strength=5 -o NUL iphone6s_4k.yuv 
vpxenc.exe -v --ivf --good --passes=2 --pass=2 --fpf=vp9.pass --threads=4 --target-bitrate=256 --cpu-used=2 --tile-columns=4 --end-usage=q --cq-level=20 --arnr-maxframes=7 --arnr-type=3 --arnr-strength=5 -o out2.ivf iphone6s_4k.yuv

[sneaker_ger]

vpxenc has automated two-pass. You only run it once. If you run it twice you are basically doing 4 passes with the first 2 being wasted into NUL. Try running it only once and check if that is the case. It was for me the last time I tested. (Granted, long time ago and I don't remember the commands I used from the top of my head.)

[Jamaika]

OK. I accepted the news, but this command ffmpeg gave different results. Different (~300kb)

ffmpeg.exe -loglevel trace -y -i iphone6s_4k.yuv -c:v libvpx-vp9 -b:v 0 -crf 20 -quality good -threads 4 -cpu-used 2 -tile-columns 4 -arnr-maxframes 7 -arnr-type 3 -arnr-strength 5 -pass 2 -an out1a.ivf

[easyfab]

Perhaps others settings have not the same defaults in FFmpeg and Vpxenc ?

[sneaker_ger]

Radeon Software Crimson ReLive Edition 16.12.2 Highlights
Fixed Issues

• Chromium may fail to utilize hybrid decode for VP9 content.

http://support.amd.com/en-us/kb-arti...ase-Notes.aspx

[Selur]

According to https://en.wikipedia.org/wiki/VP9:

VP9 supports HDR video using Hybrid Log-Gamma (HLG) and Perceptual Quantizer (PQ)

but when I compile vp9 using (https://github.com/jb-alvarado/media-autobuild_suite) the vpxenc command line options don't mention it and I can't find any documentation about 'VP9-HLG' which describes how to create such content.
-> Does anyone here have a clue how to create VP9 with HLG ?

Cu Selur

[Jamaika]

Originally Posted by Selur

VP9 supports HDR video using Hybrid Log-Gamma (HLG) and Perceptual Quantizer (PQ)

https://www.tapatalk.com/topic/47413...dr-android-7-0
I am writing as an amateur because he didn't compile VP9.
For me, reading google is an option only android 7.0. And I think this is April Fool's Day.
Then it was written that this isn't an option codec VP9 only container matroska. Not this topic.
Option container matroska can be found in the directory libwebm / mkvmuxer / mkvmuxerutil.cc

PHP Code:

bool IsTransferCharacteristicsValueValid(uint64_t value) {
  switch (value) {
    case mkvmuxer::Colour::kIturBt709Tc:
    case mkvmuxer::Colour::kUnspecifiedTc:
    case mkvmuxer::Colour::kReservedTc:
    case mkvmuxer::Colour::kGamma22Curve:
    case mkvmuxer::Colour::kGamma28Curve:
    case mkvmuxer::Colour::kSmpte170MTc:
    case mkvmuxer::Colour::kSmpte240MTc:
    case mkvmuxer::Colour::kLinear:
    case mkvmuxer::Colour::kLog:
    case mkvmuxer::Colour::kLogSqrt:
    case mkvmuxer::Colour::kIec6196624:
    case mkvmuxer::Colour::kIturBt1361ExtendedColourGamut:
    case mkvmuxer::Colour::kIec6196621:
    case mkvmuxer::Colour::kIturBt202010bit:
    case mkvmuxer::Colour::kIturBt202012bit:
    case mkvmuxer::Colour::kSmpteSt2084:
    case mkvmuxer::Colour::kSmpteSt4281Tc:
    case mkvmuxer::Colour::kAribStdB67Hlg:
      return true;
  }
  return false;
} 


Edit: Ok, In VP9 has inactive option HDR if we compile (hdr_util.cc, file_util.cc). In theory it should work. The strange thing is that I can't add a transfer option.
https://chromium-review.googlesource.com/#/c/400084/

PS The codec has damaged the function fps.

[nevcairiel]

Originally Posted by Selur

-> Does anyone here have a clue how to create VP9 with HLG ?

VP9 itself doesn't signal any of the HDR metadata, neither in HDR10 (ie. PQ) mode or HLG mode, it needs to be signaled through the container (ie. webm/matroska).

So basically, just encode the content mastered in HLG, and then instruct the container to convey the HLG transfer information during muxing.
Luckily HLG doesn't need any fancy metadata, other then signaling that the content is in fact HLG.

[Selur]

So we will have to wait till muxers like mkvtoolnix, mp4box, ffmpeg,.. support signaling the content as HLG and there isn't anything needed for the encoders to support.
Thanks for the explanations.

Cu Selur

[sneaker_ger]

For mkvmerge see:
https://mkvtoolnix.download/doc/mkvmerge.html#d4e2614
https://www.matroska.org/technical/s...ex.html#Colour

[david.copperfield1337]

https://github.com/YouTubeHDR/hdr_metadata

Gesendet von meinem Nexus 7 mit Tapatalk

[Jamaika]

Originally Posted by david.copperfield1337

https://github.com/YouTubeHDR/hdr_metadata

Gesendet von meinem Nexus 7 mit Tapatalk

Sorry, something I don't understand. Youtube boasts movies VP9 HDR. Unfortunately, I don't see movies 10bit. Are they done with HDR at 8bit color range tv?

./src/mkvmerge \
      -o output.mkv\
      --colour-matrix 0:9 \
      --colour-range 0:1 \
      --colour-transfer-characteristics 0:16 \
      --colour-primaries 0:9 \
      --max-content-light 0:1000 \
      --max-frame-light 0:300 \
      --max-luminance 0:1000 \
      --min-luminance 0:0.01 \
      --chromaticity-coordinates 0:0.68,0.32,0.265,0.690,0.15,0.06 \
      --white-colour-coordinates 0:0.3127,0.3290 \
      input.mov

--colour-bits-per-channel 0:10 ???
--chroma-subsample 0:1,0 ???
--colour-range 0:2 ???

https://www.youtube.com/watch?v=tO01J-M3g0U

[sneaker_ger]

10 bit VP9 is there. Doesn't have to be tagged as 10 bit on the container level to be 10 bit.
https://forum.doom9.org/showpost.php...&postcount=543

Meaning of Matroska values are in the specs:
https://www.matroska.org/technical/s...ex.html#Colour

[Jamaika]

Originally Posted by sneaker_ger

Doesn't have to be tagged as 10 bit on the container level to be 10 bit.

None of this don't understand.
"Free YouTube download" doesn't see the color matrix or HDR. For me fake.
Stream #0:1(eng): Video: vp9 (Profile 0), yuv420p(tv, bt709/unknown/unknown), 3840x2160, SAR 1:1 DAR 16:9, 59.94 fps, 59.94 tbr, 1k tbn, 1k tbc (default)

[sneaker_ger]

Read the post I linked. youtube-dl can download the 10 bit (profile 2) streams.

[Selur]

@sneaker_ger: Thanks.

[Jamaika]

Originally Posted by sneaker_ger

Read the post I linked. youtube-dl can download the 10 bit (profile 2) streams.

Ah, I understood what was going on. I don't know why so many intricacies.
youtube-dl.exe -o "The World in HDR.webm" -v -f "(mp4)bestvideo/best[height=2160]+bestaudio/best[height=2160]" https://www.youtube.com/watch?v=tO01J-M3g0U
And even displays ffmpeg the message.
Stream #0:0(eng): Video: vp9 (Profile 2), yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 3840x2160, SAR 1:1 DAR 16:9, 59.94 fps, 59.94 tbr, 1k tbn, 1k tbc (default)
Side data:
Mastering Display Metadata, has_primaries:1 has_luminance:1 r(0.6800,0.3200) g(0.2649,0.6900) b(0.1500 0.0600) wp(0.3127, 0.3290) min_luminance=0.001000, max_luminance=1000.000000
..., but where came it from? It's only change for file 10/12bit apart from the colour range and matix.