[Bug 764769] New: matroskamux: make timecodescale configurable

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764769

            Bug ID: 764769
           Summary: matroskamux: make timecodescale configurable
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: lists at svrinformatica.it
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 325576
  --> https://bugzilla.gnome.org/attachment.cgi?id=325576&action=edit
make timecodescale configurable

In a very specialized app I produce buffers with timestamp equal to millisecond
and different for microsecond/nanosecond, the default timecode scale used in
matroskamux will produce blocks with the same timestamp in this case since it
use millisecond precision

Tha attached patch make timecodescale configurable using a property.

You can test with this pipeline:

videotestsrc ! jpegenc ! matroskamux ! filesink ...

mkvinfo shows  1000000 as timecodescale 

if you now use this pipeline:

filesrc ! matroskademux ! fakesink

you'll see buffers with millisecond precision

setting timecodescale on the muxer you can change the precision and mkvinfo
will show the value you set.

See also this for a more general use case

https://matroska.org/technical/specs/notes.html#TimecodeScale

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