Dolby Vision now possible through MP4 Mux.

[DjObama]

I set line 69 to FLAC as you instructed but the worflow 4-3-1 failed with:

Working fine on my end. Are you using your own ffmpeg ? if yes try with the version that comes with my tool pack.

Thank you, YES! That was the case, I had old ffmpeg. I'm happy to report Flac audio works with p7 DT-DL in MP4 container (Edit. On my LG B8)
Compression level 0 you set for flac encode is a good choice, I compared with level 5 on 2,5h movie and the size difference was only 200 mb.

However, the dts-hd ma track got discarded upon conversion, am I missing a setting to keep the original audio track?

[RESET_9999]

yes, it's by design but I can remove that restriction in the next version.
for workflow 4-3-1, remove at lines 7331-7343: if not "%encode_LL%"=="YES"

replace:

Code: Select all

for /L %%i in (1,1,%count%) do ( 
     if "%encode_LL%"=="YES" if exist "%TEMP%audio_%%i_!T%%i.Lang!.thd" "%ffmpeg_path%" -i "%TEMP%audio_%%i_!T%%i.Lang!.thd" -map 0:0 -c %llcodec% "%TEMP%pcm%%i.%mcont%"& set AL%%i=-add "%TEMP%pcm%%i.%mcont%"#audio:lang=!T%%i.Lang!:name=%mname%!FORCED%%i!
)
for /L %%i in (1,1,%count%) do (
     if exist "%TEMP%audio_%%i_!T%%i.Lang!.thd"	if "%keep_lossless%"=="YES" if not "%encode_LL%"=="YES" "%ffmpeg_path%" -y -i "%TEMP%audio_%%i_!T%%i.Lang!.thd" -map 0:0 -c copy -strict -2 "%TEMP%lossless%%i.mp4" & set AL%%i=-add "%TEMP%lossless%%i.mp4"#audio:lang=!T%%i.Lang!:name=THD!FORCED%%i!
)

for /L %%i in (1,1,%count%) do ( 
     if "%encode_LL%"=="YES" if exist "%TEMP%audio_%%i_!T%%i.Lang!.dts" "%ffmpeg_path%" -i "%TEMP%audio_%%i_!T%%i.Lang!.dts" -map 0:0 -c %llcodec% "%TEMP%pcm%%i.%mcont%"& set AL%%i=-add "%TEMP%pcm%%i.%mcont%"#audio:lang=!T%%i.Lang!:name=%mname%!FORCED%%i!
)
for /L %%i in (1,1,%count%) do (
     if exist "%TEMP%audio_%%i_!T%%i.Lang!.dts"	if "%keep_lossless%"=="YES" if not "%encode_LL%"=="YES" "%ffmpeg_path%" -y -i "%TEMP%audio_%%i_!T%%i.Lang!.dts" -map 0:0 -c copy "%TEMP%lossless%%i.mp4" & set AL%%i=-add "%TEMP%lossless%%i.mp4"#audio:lang=!T%%i.Lang!:name=DTS!FORCED%%i!
)

[ans40]

For injecting both HDR10+ and DV into the same BL, does it matter which you do first?

[powdeau]

@RESET_9999 Do i need to change something in your DaVinci preset for DV generation in 18.6 or is everything the same?
Now I have these settings:

Thanks!

[RESET_9999]

For injecting both HDR10+ and DV into the same BL, does it matter which you do first?

no

is everything the same?

yes

[DjObama]

Hi,
I did some more testing with Flac audio. For some movies after converting trueHD/dts-hd to Flac (i think it applies to lpcm too) the resulting audio track is significantly lower volume. Probably because dts contains metadata that instructs the receiver by how much it should boost the signal and flac/lpcm is just raw audio information. For example Gladiator is a movie for which flac/lpcm is 4,5 dB lower than it could be.
I found a good way to safely increase the signal with ffmpeg. First you have to find by how many dB you can losslessly increase volume with this command:

Code: Select all

ffmpeg -i video.avi -af "volumedetect" -vn -sn -dn -f null /dev/null

This outputs information about how much dB you can increse the volume without going into clipping. For example:

[Parsed_volumedetect_0 @ 0x7f8ba1c121a0] mean_volume: -16.0 dB
[Parsed_volumedetect_0 @ 0x7f8ba1c121a0] max_volume: -5.0 dB
[Parsed_volumedetect_0 @ 0x7f8ba1c121a0] histogram_0db: 87861

Important is only the max_volume
Then use the command to increase the volume by max_volume amount:

Code: Select all

  ffmpeg -i input.wav -af "volume=5dB" output.wav

This command only boosts the overall signal, there is no normalization happening, so it's still a lossless process.

Is it possible to incorporate this process into dovi_scripts @RESET_9999
You can find more information about it under this link (Option 3)
https://superuser.com/questions/323119/ ... ing-ffmpeg

[PhantomIceman]

This may have been answered somewhere within this thread but since makemkv is able to rip the dolby vision layer is it possible to create a dolby vision playable mkv file through mkv or do you have use scripts?

[Gatorman]

This may have been answered somewhere within this thread but since makemkv is able to rip the dolby vision layer is it possible to create a dolby vision playable mkv file through mkv or do you have use scripts?

This really depends on the player you plan on viewing your media on. Checkout the signature under RESET_9999.

[RESET_9999]

Hi,
I did some more testing with Flac audio. For some movies after converting trueHD/dts-hd to Flac (i think it applies to lpcm too) the resulting audio track is significantly lower volume.

I'll check it out but I'm pretty sure LPCM is fine.

EDIT: did some tests and the original THD/DTS, flac or lpcm all sound at the same level on my PC.
Anyway, I added -drc_scale 0 in the cli, maybe that will help?

[DjObama]

Hi,
I did some more testing with Flac audio. For some movies after converting trueHD/dts-hd to Flac (i think it applies to lpcm too) the resulting audio track is significantly lower volume.

I'll check it out but I'm pretty sure LPCM is fine.

EDIT: did some tests and the original THD/DTS, flac or lpcm all sound at the same level on my PC.
Anyway, I added -drc_scale 0 in the cli, maybe that will help?

Yes, I checked and on PC there is no problem. However on TV there is a significant diffrence. I just checked another movie - Hero (2002), not even a HDR movie, but Flac plays very quiet compared to dts. Can somebody check the flac playback on their tvs/recievers compared to dts-hd tracks? I read about it a bit and seems that dts format boosts the volume while decoding, but it doesn't happen on pc.

[skull88]

Hi,
I did some more testing with Flac audio. For some movies after converting trueHD/dts-hd to Flac (i think it applies to lpcm too) the resulting audio track is significantly lower volume.

I'll check it out but I'm pretty sure LPCM is fine.

EDIT: did some tests and the original THD/DTS, flac or lpcm all sound at the same level on my PC.
Anyway, I added -drc_scale 0 in the cli, maybe that will help?

Yes, I checked and on PC there is no problem. However on TV there is a significant diffrence. I just checked another movie - Hero (2002), not even a HDR movie, but Flac plays very quiet compared to dts. Can somebody check the flac playback on their tvs/recievers compared to dts-hd tracks? I read about it a bit and seems that dts format boosts the volume while decoding, but it doesn't happen on pc.

Sounds like this is not an issue that should really be troubleshooted on this thread, but on a forum or subreddit relating to your TV or AVR? I recommend you try E-AC3 instead of FLAC, as it is 2nd best alternative if you aren't happy with FLAC playback or adjusting volume on the fly when you watch movies.

[ans40]

Quick question; when generating CMv4.0 content (3-1), how does one determine what Mastering Display to use? I assuming higher isn't necessarily better?

2 options:

1- just use the static metadata from your source HDR10
2- check the brightness first with madvr. If 95% of the movie is under 1000nits, use 1000nits MDL else, 4000.

Option 2 is better because some movies have a static MDL of 4000nits but the actual brightness is under 1000nits.
A 4000nits RPU is a lot darker than a 1000nits one regardless of the content's actual brightness and in my opinion, 4000nits MDL + low nits content is wrong without L2 trim passes because if you look at the generated(or original) trims with a 4000nits analysis, they brighten/compensate a lot for the darkness a 4000 rpu brings.

https://slow.pics/c/uVX5iFOD

Using Resolve to generate DV.

BL HDR10: https://ibb.co/fYWDhzp

Thoughts on using a 2000nit MDL? It has a decent amount of scenes over 1000 nits. 4000 seems excessive though, so I'm between 1000 and 2000nit MDL for Resolve DV analysis. TIA

[skull88]

Quick question; when generating CMv4.0 content (3-1), how does one determine what Mastering Display to use? I assuming higher isn't necessarily better?

2 options:

1- just use the static metadata from your source HDR10
2- check the brightness first with madvr. If 95% of the movie is under 1000nits, use 1000nits MDL else, 4000.

Option 2 is better because some movies have a static MDL of 4000nits but the actual brightness is under 1000nits.
A 4000nits RPU is a lot darker than a 1000nits one regardless of the content's actual brightness and in my opinion, 4000nits MDL + low nits content is wrong without L2 trim passes because if you look at the generated(or original) trims with a 4000nits analysis, they brighten/compensate a lot for the darkness a 4000 rpu brings.

https://slow.pics/c/uVX5iFOD

Using Resolve to generate DV.

BL HDR10: https://ibb.co/fYWDhzp

Thoughts on using a 2000nit MDL? It has a decent amount of scenes over 1000 nits. 4000 seems excessive though, so I'm between 1000 and 2000nit MDL for Resolve DV analysis. TIA

This is for Interstellar, and the way a movie is shot, not just plot peaks, should be taken into account when making the choice. A number of poorly lit scenes really demonstrate that 4K may not be ideal for them, but other scenes are much brighter. I marginally prefer a 1K MDL for generation on this one having watched with both 4K and 1K injected RPUs, but I guess you could try 2K as a compromise, it's honestly a toss-up and personal preference on this title in the end. Oh, and if doing yourself, make sure to correctly set L5/blanking on the IMAX shots vs. main timeline blanking.

[RESET_9999]

Thoughts on using a 2000nit MDL? It has a decent amount of scenes over 1000 nits. 4000 seems excessive though, so I'm between 1000 and 2000nit MDL for Resolve DV analysis. TIA

You should update your script, I added more information that makes the decision easier. My initial recommendation was if 95% is under 1000nits , choose 1000nits and for this movie only 2.4% is over 1k. I personally opted for the 1000nits MDL.
But as @skull88 said, we probably should consider the avg_pq too and I'm still thinking about the % (I'm gathering more information). Also, madvr definitely includes the black bars in its measurement so maxfall (without cropping) will always be lower than it is in reality. see: https://slow.pics/c/pV4NXJMB

BTW, here's my Resolve project for this movie, this will save you a lot of time
https://drive.google.com/drive/u/0/fold ... rHG4XNSy8x

[Gatorman]

I've noticed the default x265 HDR encoder settings batch file has a flag to set --max-luma to 1023. Should this be modified if the source file has a MaxCLL of 4000?