'''
Rework packaging flow:

 1. queue pickup

 2. origin-specific handling
    Create initial package

 3. create id dir in processing
    Add workbase to package
    
 3. transcoding and thumb generation
    Put new files in processing
    Update package with new relative names
    
 4. stash originals
    Move original files to processing subdir

 5. platform notification
    Temporarily remove base, workbase, update_id
 
 6. finalize processing
    Remove base, workbase, update_id, notification_id
    Save package to disk
    Move processing dir to processed
    Delete queue file
    Delete base files    
'''


# package.json:

{
    'id':              assigned_id,     # Unique job id
    'update_id':       id_to_replace,   # id of original if updating
                                        # only exists for update
                                        # remove before publishing
    'notification_id': some_id,         # only exists for manual
                                        # remove before publishing
    'base':            uploaded_path,   # remove before publishing
    'workbase':        work_path,       # remove before publishing
    'origin':          cattura_etc,
    'creation':        0,
    'title':           "",
    'presenters':      [],
    'courses':         [],
    'duration':        0,
    'thumb':           '',
    'tags':            [],
    'sources':         [
	{
	    'name':    'main',
            'video':   {
                resolution: source['video'], # resolution should be the vertical 
                ...                          # resolution as a string, eg '720' etc
            },
            'poster':       source.get('poster', ''),
            'playAudio':    source['playAudio']
        },
        ...
    ],
    'slides': [
        {
	   'url':      '',	# a valid http(s) URL
	   'duration': 0	# an integer number of milliseconds
	},
	...
    ]
}