Convert DV mkv -> mp4 with mkvextract and dolby mp4_muxer

[jb044]

hi there,

So I have a LG Oled C1 that does support Dolby Visual on mp4 but not on mkv's.
So I convert the mkv's like this:

$ mkvextract Benedetta\ \(2021\).mkv tracks 0:Benedetta\ \(2021\).hevc 2:Benedetta\ \(2021\).ac3 4:Benedetta\ \(2021\).srt
Uittreksel van spoor 0 met de CodecID 'V_MPEGH/ISO/HEVC' naar bestand 'Benedetta (2021).hevc'. Inhoud format: HEVC/H.265 elementary stream
Uittreksel van spoor 2 met de CodecID 'A_AC3' naar bestand 'Benedetta (2021).ac3'. Inhoud format: Dolby Digital (AC-3)
Uittreksel van spoor 4 met de CodecID 'S_TEXT/UTF8' naar bestand 'Benedetta (2021).srt'. Inhoud format: SRT text subtitles
Waarschuwing: Spoor 0: NAL te groot. Grootte conform het beginblok veld: 384, beschikbare in pakket: 11. Deze NAL is defect en wordt overgeslagen.
Voortgang: 100%

$ /home/jeroen/Build/dlb_mp4base/make/mp4muxer/linux_amd64/mp4muxer_release --dv-profile 5 -i Benedetta\ \(2021\).hevc -i Benedetta\ \(2021\).ac3 --media-lang eng -o Benedetta\ \(2021\).mp4 --overwrite

I'm a bit conserned about the NAL too big part for the hevc track, the result however does play as Dolby Visual on my LG. Simply wondering if I'm missing (meta) data here.
If I understand correctly this is a bug with mkvextract that other simular (GUI) tools don' t seem to have. I'm working on the terminal however.

TIA!

Oh and Plex reports some less bandwith on the stream for the mp4

[LigH.de]

Seriously ... "Dolby Vision" (Vision, not Visual) needs a different acronym. Whenever I read "DV", it is still "Digital Video" (a vintage video format, similar to Motion-JPEG) for me...

Does ffmpeg support direct remultiplexing (possibly with additional parameters for more specific metadata control)?

[Ennio]

If I understand correctly this is a bug with mkvextract that other simular (GUI) tools don' t seem to have.

Can you explain what mkvextract bug "this" exactly would be?

[jb044]

If I understand correctly this is a bug with mkvextract that other simular (GUI) tools don' t seem to have.

Can you explain what mkvextract bug "this" exactly would be?

There was an issue on mkvtoolnix for this, cannot find I know. But the bottemline was: too few developers working in their spare time, too litte time.

Will try the ffmpeg suggestion If I see much difference in output quality and bitrate.

[jb044]

Seriously ... "Dolby Vision" (Vision, not Visual) needs a different acronym. Whenever I read "DV", it is still "Digital Video" (a vintage video format, similar to Motion-JPEG) for me...

Does ffmpeg support direct remultiplexing (possibly with additional parameters for more specific metadata control)?

You are right sir! All these emerging standards and camps are confusing :/ Let alone difficult to find something that just works (tm)! WIll try the ffmpeg solution and report back.

[jb044]

IIRC it is this issue: https://gitlab.com/mbunkus/mkvtoolnix/-/issues/2784

Tried ffmeg but the result is about 20GB smaller then the original :/