I remember that with old MorphOS system the mkv video format or container (with video, audio and subtitles) was possible open the file like a zip file for example and can be able to access to separete files, in the last systems versions not, will be possible a way to have access for example the audio files from this format? Thanks.
Yes, there is tools in others systems, but I am interesting on MorphOS, if it is possible.

You can use ffmpeg to extract stuff from mkv.

https://gist.github.com/cdeath/1f8fdd96ead3829465897e413188190a

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Thank you interesting option, complicated, but interesting.

@Templario Which old system?

MENCoder should do it:

mencoder file.video -ovc raw -of rawaudio -oac mp3lame -lameopts cbr:br=128 -o RAM:file.mp3

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I don't remenber which MorphOS version was possible open the mkv container, although I couln't got the filen inside if, and not it was in MorphOS because Windows or Linux ope the video player.