Demux Workflow Operation

ID: demux

Description

The demux operation can be used to demux multiple streams (e.g. presenter and presentation) from one container and put them into separate tracks. It uses a special encoding profile that has two outputs. It flavors the target media in the order listed in the encoding profile output.

Parameter Table

Configuration Key	Example	Description
source-flavors	multitrack/source	Which media should be encoded
target-tags	archive,exp;exp	Specifies the tags of the new media
target-flavors	presenter/*,presentation/*	Specifies the flavors of the new media
encoding-profile	demux	Specifies the encoding profile

Note that target-tags can hold multiple sets of tags separated by ;. Each set is applied to the matching set of output files (same order). Target flavors are separated by , as usual. They are applied in order as well.

Operation Example

<operation
    id="demux"
    description="Extract presenter and presentation video from multitrack source">
  <configurations>
    <configuration key="source-flavors">multitrack/source</configuration>
    <configuration key="target-flavors">presenter/source,presentation/source</configuration>
    <configuration key="target-tags">archive</configuration>
    <configuration key="encoding-profile">demux</configuration>
  </configurations>
</operation>

Example Profile

profile.demux.name = demux
profile.demux.input = visual
profile.demux.output = visual
profile.demux.suffix = .mp4
profile.demux.ffmpeg.command = -i #{in.video.path} -c copy \
  -map 0:a:0 -map 0:v:0 #{out.dir}/#{out.name}_presenter#{out.suffix} \
  -map 0:a:1 -map 0:v:1 #{out.dir}/#{out.name}_presentation#{out.suffix}