Dolby Vision now possible through MP4 Mux.

[Manixx2020beyound]

thanks that worked!

I see that we can keep DVH1 with profile 8 file using mp4box... maybe we dont have to use profile 5 on the ATV ???

Code: Select all

ID                                       : 1
Format                                   : HEVC
Format/Info                              : High Efficiency Video Coding
Format profile                           : Main 10@L5.1@High
HDR format                               : Dolby Vision, Version 1.0, dvhe.08.06, BL+RPU, HDR10 compatible / SMPTE ST 2086, HDR10 compatible
Codec ID                                 : dvh1
Duration                                 : 4 min 59 s
Bit rate                                 : 68.4 Mb/s
Maximum bit rate                         : 121 Mb/s
Width                                    : 3 840 pixels
Height                                   : 2 160 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 (24000/1001) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0 (Type 2)
Bit depth                                : 10 bits
Compression mode                         : Lossy
Bits/(Pixel*Frame)                       : 0.344
Stream size                              : 2.39 GiB (85%)
Title                                    : hevc:dv-profile=f8.hdr10:hdr=none@GPAC2.0-rev0-g418db414-master
Encoded date                             : UTC 2022-07-18 14:41:27
Tagged date                              : UTC 2022-07-18 14:41:31
Color range                              : Limited
Color primaries                          : BT.2020
Transfer characteristics                 : PQ
Matrix coefficients                      : BT.2020 non-constant
Mastering display color primaries        : Display P3
Mastering display luminance              : min: 0.0050 cd/m2, max: 1000 cd/m2
Maximum Content Light Level              : 1000 cd/m2
Maximum Frame-Average Light Level        : 986 cd/m2
mdhd_Duration                            : 300008
Codec configuration box                  : hvcC+dvvC

Tried the 8.1 dvh1
Produced from resolve no go.
Tried that a while ago apple won’t do 8.1
Reguardless of dvh1.
But other folks should still try it just to verify.

[RESET_9999]

@ragico just tested and it's working in MP4 P8 DVH1 + LPCM audio.

sample: https://drive.google.com/file/d/1lsSQUU ... sp=sharing

so we dont have to use fake P5 on the ATV, this is great news.

Apple native player = DV with rpu working
PLEX = DV but rpu not working
Infuse = HDR10

[sw5163]

There is no indication of atmos but the sound generated is immersive and engaging.

That's expected, conversion from TrueHD/atmos to PCM lose atmos data. That's why I'm trying to find a way to get Dolby MAT PCM with object coding.

[sw5163]

ah, I know why my lpcm track didn't work on the ATV (video and lossy audio were ok).

My mp4 headers depending on my command line were:

I don't know what the mp4 headers should be, so I just let those tools to decide.

The only problem I see with this method is that the static MDL metadata seems messed up now.

What's that? Will that cause a problem in DV play? If it doesn't affect final image, I wouldn't bother to change it.

[sw5163]

@ragico just tested and it's working in MP4 P8 DVH1 + LPCM audio.

Like I posted last month

mp4box with following command can also get dolby vision to work:
mp4box -add BL_RPU.hevc -new p5.dvh1.mp4
mp4box -add BL_RPU.hevc:dv-profile=8.1 -new p8.hvc1.mp4(this doesn't work, it's a SMB bug)
mp4box -add BL_RPU.hevc:dv-profile=f8.1 -new p8.dvh1.mp4

But fake p5.dvh1 is the most stable way, it guarantee DV play.
Besides there are official release use fake p5.dvh1(those Apple TV screensaver).
And I've never seen p8 with dvh1 except from my experiment result.
So I think it's better for us to just stick to fake p5.dvh1 for now.
Also p8.dvh1 seems to let Apple think it's an HLG, video significantly darker than normal on my iPad.
p7.dvh1 play properly. Let's not make this even more complicated.

[sw5163]

Do you know a way to generate "PCM joint object coding"?
You are the professional here.
Or is there indeed no public way except in Dolby Lab they can generate that?

I think this is possible because there are sound systems can receive "PCM/atmos".
And Apple tv actually decode EAC3/atmos and re-encode to PCM/atmos to pass to sound system.
So I figure if I provide PCM/atmos that is already decoded to ATV, it will "passthrough" that, and we get lossless/atmos.

[sergonnn111]

Guys can i do ts file dolby vision with ts muxer nightly for native tv player LG OLED 2018 from blu ray bdmv dolby vision ?

[RESET_9999]

Like I posted last month
mp4box with following command can also get dolby vision to work:
mp4box -add BL_RPU.hevc -new p5.dvh1.mp4
mp4box -add BL_RPU.hevc:dv-profile=8.1 -new p8.hvc1.mp4(this doesn't work, it's a SMB bug)
mp4box -add BL_RPU.hevc:dv-profile=f8.1 -new p8.dvh1.mp4

sorry, your post was about an ipad and sdr output, I didnt give much attention to it back then.

But fake p5.dvh1 is the most stable way, it guarantee DV play.
Besides there are official release use fake p5.dvh1(those Apple TV screensaver).
And I've never seen p8 with dvh1 except from my experiment result.
So I think it's better for us to not make this even more complicated and just stick to fake p5.dvh1 for now.

I disagree, I prefer using a format that follows Dolby's specifications.
Apple products are stupid and always does stuff differently, I learned to never trust them.

I don't know what the mp4 headers should be, so I just let those tools to decide.

I did not change the headers!
but when you import LPCM audio to an existing DV mp4 with mp4box, the headers are not the same and the pcm audio no longer works on AppleTV.

What's that? Will that cause a problem in DV play? If it doesn't affect final image, I wouldn't bother to change it.

That's the mastering display luminance specs. I don't know if it affects the final image but it can easily be fixed, see quietvoid's reply.

[sw5163]

But fake p5.dvh1 is the most stable way, it guarantee DV play.
Besides there are official release use fake p5.dvh1(those Apple TV screensaver).
And I've never seen p8 with dvh1 except from my experiment result.
So I think it's better for us to not make this even more complicated and just stick to fake p5.dvh1 for now.

I disagree, I prefer using a format that follows Dolby's specifications.

p8.dvh1 contrast is wrong on my iPad, if ATV can handle it, okay then.

Apple products are stupid and always does stuff differently, I learned to never trust them.

I agree.

That's the mastering display luminance specs. I don't know if it affects the final image but it can easily be fixed, see quietvoid's reply.

Thanks for the explanation!

[RESET_9999]

p8.dvh1 contrast is wrong on my iPad, if ATV can handle it, okay then.

oh indeed, that could be a problem... since your ipad output SDR, could you take screenshots that show the difference?
thanks

@ragico, could you compare the P5 and P8 version of the SM clip please?

[ragico]

p8.dvh1 contrast is wrong on my iPad, if ATV can handle it, okay then.

@ragico, could you compare the P5 and P8 version of the SM clip please?

To my eyes, P5 looks brighter and has more contrast.

[sw5163]

p8.dvh1 contrast is wrong on my iPad, if ATV can handle it, okay then.

oh indeed, that could be a problem... since your ipad output SDR, could you take screenshots that show the difference?
thanks

Sure.
From Apple screen saver: (left p8.dvh1 right p5.dvh1)

1.PNG (1.45 MiB) Viewed 10797 times

From your test sample: (left p8.dvh1 right p5.dvh1)

The attachment 2.PNG is no longer available

The attachment 3.PNG is no longer available

These screenshots can stand for what I'm seeing.
Left image has very low contrast, looks definitely wrong.
But RPU are working on both.
So I guess Apple treat p8.dvh1 as HLG BL as they were shot by iPhone.

[RESET_9999]

p8 clearly isn't tonemapped to SDR on those pic. (looks like PQ)

but since ragico report the same on the ATV, then I stand corrected.

[sw5163]

p8 clearly isn't tonemapped to SDR on those pic. (looks like PQ)

I'm not sure but Apple recognize them as HDR, see top left corner.

But RPU are working on both.
So I guess Apple treat p8.dvh1 as HLG BL as they were shot by iPhone.

You may also wanna answer sergonnn111's question? He's been asking a several times.

Guys can i do ts file dolby vision with ts muxer nightly for native tv player LG OLED 2018 from blu ray bdmv dolby vision ?

[RESET_9999]

You may also wanna answer sergonnn111's question? He's been asking a several times.

yeah I don't answer those questions anymore
All he has to do is to check the Playback Device sheet in my signature.