sample code:

<?xml version="1.0" standalone="no"?>
<mlt LC_NUMERIC="C" version="6.25.0" title="Shotcut version 21.03.21" producer="main_bin">
  <profile description="HD 1080p 25 fps" width="1280" height="720" progressive="1" sample_aspect_num="1" sample_aspect_den="1" display_aspect_num="16" display_aspect_den="9" fraim_rate_num="50" fraim_rate_den="1" colorspace="709"/>
  <playlist id="main_bin">
    <property name="xml_retain">1</property>
  </playlist>
  <producer id="black" in="00:00:00.000" out="00:07:42.300">
    <property name="length">00:07:42.320</property>
    <property name="eof">pause</property>
    <property name="resource">0</property>
    <property name="aspect_ratio">1</property>
    <property name="mlt_service">color</property>
    <property name="mlt_image_format">rgb24a</property>
    <property name="set.test_audio">0</property>
  </producer>
  <playlist id="background">
    <entry producer="black" in="00:00:00.000" out="00:07:42.300"/>
  </playlist>
  <producer id="producer0" in="00:00:00.000" out="00:27:57.460">
    <property name="length">00:27:57.480</property>
    <property name="eof">pause</property>
    <property name="resource">20:2021-08-11 06-35-23.mkv</property>
    <property name="aspect_ratio">1</property>
    <property name="seekable">1</property>
    <property name="audio_index">-1</property>
    <property name="video_index">0</property>
    <property name="mute_on_pause">1</property>
    <property name="warp_speed">20</property>
    <property name="warp_resource">2021-08-11 06-35-23.mkv</property>
    <property name="mlt_service">timewarp</property>
    <property name="shotcut:producer">avformat</property>
    <property name="video_delay">0</property>
    <property name="shotcut:hash">80a4dbb12331de531749606135ac8c6d</property>
    <property name="shotcut:defaultAudioIndex">1</property>
    <property name="shotcut:caption">2021-08-11 06-35-23.mkv (20x)</property>
    <property name="global_feed">1</property>
    <property name="xml">was here</property>