Suppose you have an FHD movie with a for example DTS-Master track and then you have the same movie in 4k but only in 2.0 sound.
What you can do is take the master track from the FHD and muxe it to the 4k movie. However, this only works if both films are frame exactly, has the same length.
What if one movie is one second longer or shorter, but is otherwise synchronous, what options are there without re-encoding?
The video can be shortened or lengthened slightly, e.g. by inserting black frames, but how and do I loose HDR meta data?
Or I can cut away audio a little bit, but how I do that when its DTS or Atmos?
Third possibility: I add a delay into the MKV file, but can players handle this well, is this a usable solution, what you think?
mkv container supports audio delay parameter. I have done what you mention on a few movies. You just have to figure out what the correct delay is to get the lipsync right. It can be a positive or negative amount.
The most extreme case I have is Psych season 1. The DVD has 5.1 surround, but the Blu-Ray only has stereo. The scene changes are at different times about 80% of the time. I’m using a wave editor to manually add or remove silence between scenes.
Side note: I’m not sure if I agree with DTS Master Audio. Flac is lossless and smaller. I guess maybe it doesn’t have the 3D positional info, but neither do most home systems.
Thanks this is what I tought mkv delay parameter is the easy way to go, if the player can read this correctly out. I have a Zidoo player and do some tests about now.
Edits with wave editor, you stored audio then as Surround FLAC? Does this work and gets played on your sound system (running sources over your TV and eARC back?)
I don’t know enough about DTS and Atmos, but I don’t think there’s anything mystical about it, the records and mixing to channels that makes the sound. Theoretically could it be you can have Atmos quality with FLAC 7.1 surround? But I don’t know if it’s supported on audio systems, maybe as bitstream.
Good questions. I have a little program I found that can convert flac to DTS, so that’s what I have been using on the final files. Vidmore video converter. It’s cheap enough and goes on sale about every other month.
