Edit bluray audio with UsEac3to

[DNX Silk]

I have doubts about extracting the 5.1 dts audio track with ac3-ffm because when I extract it, it says I'm missing ffm.exe I do not know if they can teach me how to configure it or if they have the program link already configured with this thanks.

[tebasuna51]

To recode DTS 5.1 to AC3 in UsEac3to you need ffmpeg.exe (https://ffmpeg.zeranoe.com/builds/) in the same folder than eac3to.exe or in the same folder than UsEac3To.exe or in a 'Encoder folder' defined in UsEac3to -> Settings -> Encoders Folder

Please read "Readme_UsEac3To.txt" or "Leeme_UsEac3To.txt" included always with UsEac3To.7z linked in https://forum.doom9.org/showthread.php?t=145574

[DNX Silk]

Thanks tebasuna, You explained to me that the default bitrate is 640 Kb / s suitable for a DTS 1536 or HD, if the track is 1509kbps, does it apply? the kbps do not have to be exact or for this case is something special ?, if the track is 768 Kb / s where I change the bibrate thanks.

[tebasuna51]

There are two Standard DTS bitrates for DVD/BD's 1536 or 768 (values selected to fit in DVD sectors).

But each encoder can make real bitrates near these values, if you open UsEac3to -> A/V Recode -> Recode to DTS you can see the exact bitrate than accept Authoring Tools for DVD/BD's:
1509.75 for the standard 1536 (some info tools can show 1510)
754.5 for the standard 768

You can see the exact bitrates allowed for AC3 in UsEac3to -> A/V Recode -> Recode to AC3: 640 (max), 576,...,448 (DVD's), 384 (min recommended for 5.1),...
The default, and max, is recommended for DTS 1509.75 or HD but you can select any other allowed values.
For the DTS 754.5 sometimes I use 512 but the 448 is more standard (DVD's)

[DNX Silk]

Ok ok, I would also like you to help me with the extraction of tracks dts 7.1, the best method of conversion to ac3 is still extract the track as w64 then load it in megui, select encoder FFMPEG AC-3: scratchpad, in configuration preferred decorder: LWLibavAudioSoruce, output channels: downmix multichannel to 5.1, the rest by default and bibrate 640, in extra copy the line -center_mixlev 0.707, or am I wrong in something ?, the bibrate can also vary in certain cases? Thank you

[tebasuna51]

All ok.
With 7.1 are always HD then use the max bitrate 640.
You can extract also the DTS instead w64 because LWLibavAudioSource can decode the DTS like eac3to.

[DNX Silk]

What do you recommend for higher quality ?, extract as dts or extract as w64 ?, also I wanted to ask the true hd are extracted as normal ac3 true?

[tebasuna51]

The DTS decoder inside eac3to (libdcadec.dll 2015) is the same than the included in LSMASHSource.dll, but this last one is more actualized (2019, support for DTS-Express at least).
For DTS-HD -> AC3 they have the same quality.

The TrueHD tracks have a included AC3 track (mandatory), is always better, and easy, extract the original AC3 than decode TrueHD, downmix to 5.1 and recode to AC3.

[DNX Silk]

Thank you for all your answers. I'll be posting another topic for now, all clear about the audio.