help! I want to split some MKV files and keep the original d.atmos

[gavinusme 1]

Basically I want to create some brief sound demos from my favourite movie action scenes. I can split my MKV files easily enough, but all the programs I have used output all the sound as stereo and/or my denon amp determines the sound of the split file as only mutli channel NOT the original which was Dolby atmos, DTS X etc. Does anybody know a program that can split my movie files but still keep the original sound?? thanks for your time and patience g

[Abobader 3470]

Hello gavinusme,

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[pwhodges 2012]

How did you split the files?  I would expect MKVToolNix to do it OK (but I don't have experience of that audio type).

Paul

[rbjtech 5284]

2 hours ago, gavinusme said:

Basically I want to create some brief sound demos from my favourite movie action scenes. I can split my MKV files easily enough, but all the programs I have used output all the sound as stereo and/or my denon amp determines the sound of the split file as only mutli channel NOT the original which was Dolby atmos, DTS X etc. Does anybody know a program that can split my movie files but still keep the original sound?? thanks for your time and patience g

If mkvtoolnix (mkvmerge) fails - then I would try ffmpeg

-ss = start time

-t = duration

.thd = truehd (with Atmos)

.dts = dts-hd ma (incl X)

.eac3 = Dolby Digital Plus (incl JOC Atmos)

ffmpeg -i "input.mkv" -ss 1:30 -t 30 -c:a copy "audio.thd"

mediainfo says they still have object data following a brief test - but I have not tested this.

ffmpeg -i "input.mkv" -ss 1:30 -t 30 -map 0:2 -c:a copy "audio.dts"

above example uses the 2nd Audio track (DTS-HD:MA-X)

Edited June 9, 2023 by rbjtech

[Thidsa 44]

Mkvtoolnix works.  Does not change the audio, just cut the file no matter which audio

[gavinusme 1]

thankyou so much will try this solutions today fingers crossed

[gavinusme 1]

thanks so much everybody!! A program called handbrake worked, changing the audio to TrueHD passthru kept dolby atmos, yay!!

[rbjtech 5284]

5 hours ago, gavinusme said:

thanks so much everybody!! A program called handbrake worked, changing the audio to TrueHD passthru kept dolby atmos, yay!!

I believe handbrake is effectively a GUI for ffmpeg under the hood - Passthru is effectively a copy - so all good

[gavinusme 1]

Does anybody know what I have to put into handbrake to get an exact video copy of a mkv video?? thanks in advance

[rbjtech 5284]

3 minutes ago, gavinusme said:

Does anybody know what I have to put into handbrake to get an exact video copy of a mkv video?? thanks in advance

Are you wanting to modify the Audio tracks but keep the video track original ?

Handbrake is a video encoder - I don't believe there is anyway to passthough the video.

If you want to keep the original video source - then some options below -

1. use mkvmerge to copy the stream and merge in your new audio tracks - easiest way to do this is to use mkvtoolnix - and just add sources from different MKV's, keeping the video track the same.

2. use ffmpeg with a -c:v copy 

 

[pwhodges 2012]

HandBrake has no facility for video passthrough; it also is not a front-end for ffmpeg CLI.

Explanation and summary here.

Paul

Edited June 15, 2023 by pwhodges

[gavinusme 1]

thankyou so much