Better way to modify a MKV ?

[Nico8583]

Hi,
I have several MKV with 1 video track x264, 1 audio track ac3 or dts, 1 to 4 subtitles streams, 1 cover / 1 small cover, 1 or 2 binaries files attachments, xml tags and chapters.
I would like to modify 1 subtitles track, so what is the better way to modify a MKV without lost any properties / settings ?
- Demux all tracks / tags and remux to a new MKV ?
- Use mmg.exe ?
Thanks !

[Music Fan]

Just extract this subtitle track with MKVExtract, modify it, open your original mkv in MKVmerge, uncheck what you don't need (including the subtitle track you extracted and modified), add the modified subtitle, choose a language tag if needed, change the order with up and down if needed, export the mkv.

[Nico8583]

Thanks :) I think also it's the better way to do that. I'll try to make a script or an app to treat all MKV in 1 pass.