Ubuntu Manpage: sreview-transcode - transcode the output of sreview-cut into production-quality media files

Provided by: sreview-encoder_0.9.3-1_all

NAME

       sreview-transcode - transcode the output of sreview-cut into production-quality media files

SYNOPSIS

       sreview-transcode TALKID

DESCRIPTION

       "sreview-transcode" performs the following actions:

       •   Look up the talk with id TALKID in the database.

       •   Create the preroll slide from the preroll template, after applying template changes to it

       •   If  a  postroll  template  is  defined,  create  the postroll slide using the same process as for the
           preroll slide. If no postroll template is defined, use the statically configured preroll

       •   If an apology template is defined and the current talk has an apology note that is  not  zero  length
           and not NULL, create the apology slide for this talk

       •   Convert  the  preroll  slide, postroll slide, and (if any) apology slide to a 5-second video with the
           same properties as the main raw video

       •   For each of the configured profiles, do a two-pass transcode of the concatenated version of  preroll,
           apology (if available), main, and postroll videos to a production video

CONFIGURATION

"sreview-transcode" considers the following configuration values:

dbistring
The DBI string used to connect to the database

pubdir
The directory in which to find the output of "sreview-cut"

outputdir
The top-level directory in which to store production output data

output_subdirs
Array of fields on which to base subdirectories to be created under "outputdir". The fields can be
one or more of:

eventid
The ID number of the event that this talk was recorded at

event
The name of the event that this talk was recorded at

event_output
The "outputdir" value in row of the events field of the event that this talk was recorded at.

room
The name of the room in which this talk was recorded

date
The date on which this talk occurred

year
The year in which this talk occurred

workdir
The location where any temporary files are stored. Defaults to "/tmp", but can be overridden if
necessary. These temporary files are removed when "sreview-transcode" finishes.

preroll_template
The name of an SVG or Synfig template to be used for the preroll (i.e., opening credits). Required.

postroll_template
The name of an SVG or Synfig template to be used for the postroll (i.e., closing credits). Either
this option or "postroll" is required.

postroll
The name of a PNG file to be used for the postroll (i.e., closing credits). Either this option or
"postroll_template" is required.

template_format
Whether the preroll, postroll, and apology templates are in SVG or Synfig format. Currently, either
all templates are SVG, or all templates are synfig; the two cannot be combined.

Valid values are "svg" (for SVG) or "synfig" (for synfig). Defaults to "svg".

apology_template
The name of an SVG template to be used for the apology slide (shown right after the opening credits
if an apology was entered). Only required if at least one talk has an apology entered.

input_profile
A profile that generates videos which can be concatenated with input videos without re-transcoding
anything. If not specified, uses the input video as a "profile".

output_profiles
An array of profile names to be produced (see above for the details). Defaults to "webm".

embedded metadata
The video files get metadata set based on the track data in the database. A useful set of metadata
tags can be found in http://wiki.webmproject.org/webm-metadata/global-metadata,
https://www.matroska.org/technical/tagging.html and
/usr/share/doc/libimage-exiftool-perl/html/TagNames/Matroska.html.

The following metadata values are set using the %sql2ffmpeg_map settings:

matruska/webm ffmpeg debconf
------------------------------------------------------- title title
event event speakers speakers
track track date starttime
recording_location - room synopsis - description
subtitle - subtitle

The following values are per 2023-09-14 not available in the data set.

matruska/webm ffmpeg debconf
------------------------------------------------------- subject - track?
content_type - type? copyright - ?
license - ? url - eventurl (to event page)

SVG TRANSFORMATIONS

       The  transformation  performed over the SVG files is a simple "sed"-like replacement of input tags in the
       template file. All data is XML-escaped first, however.

       The following tags can be set inside the SVG file:

       @SPEAKERS@
           The names of the speakers, in this format:

               Firstname Lastname, Firstname Lastname and Firstname Lastname

       @ROOM@
           The name of the room where the talk was held.

       @TITLE@
           The title of the talk.

       @SUBTITLE@
           The subtitle of the talk.

       @DATE@
           The date on which the talk was held.

       @APOLOGY@
           The apology note defined for this talk.

       If one of these fields has no data for the given talk, then the tag will be replaced by the empty  string
       instead.

       In addition, as of version 0.7, the template is processed by Mojo::Template with the SReview::Talk object
       for  the  current  talk  assigned  to  the $talk variable, which allows for far more flexibility. See the
       documentation of Mojo::Template for more details on that templating  engine,  and  the  documentation  of
       SReview::Talk for the available values from that object.

       (As  an  aside,  the SVG transformations are actually implemented through SReview::Template::SVG. See the
       documentation for that module for details)

POD ERRORS