old_contents: import logging
  from gi.repository import Gst
  
  from lib.config import Config
  from lib.tcpmulticonnection import TCPMultiConnection
  from lib.clock import Clock
  
  class AVPreviewOutput(TCPMultiConnection):
  	def __init__(self, channel, port):
  		self.log = logging.getLogger('AVPreviewOutput['+channel+']')
  		super().__init__(port)
  
  		self.channel = channel
  
  		if Config.has_option('previews', 'videocaps'):
  			vcaps_out = Config.get('previews', 'videocaps')
  		else:
  			vcaps_out = Config.get('mix', 'videocaps')
  
  		pipeline = """
  			intervideosrc channel=video_{channel} !
  			{vcaps_in} !
  			videorate !
  			videoscale method=nearest-neighbour !
  			{vcaps_out} !
  			jpegenc !
  			queue !
  			mux.
  
  			interaudiosrc channel=audio_{channel} !
  			{acaps} !
  			queue !
  			mux.
  
  			matroskamux
  				name=mux
  				streamable=true
  				writing-app=Voctomix-AVPreviewOutput !
  
  			multifdsink
  				blocksize=1048576
  				buffers-max=500
  				sync-method=next-keyframe
  				name=fd
  		""".format(
  			channel=self.channel,
  			acaps=Config.get('mix', 'audiocaps'),
  			vcaps_in=Config.get('mix', 'videocaps'),
  			vcaps_out=vcaps_out
  		)
  
  		self.log.debug('Creating Output-Pipeline:\n%s', pipeline)
  		self.outputPipeline = Gst.parse_launch(pipeline)
  		self.outputPipeline.use_clock(Clock)
  
  		self.log.debug('Binding Error & End-of-Stream-Signal on Output-Pipeline')
  		self.outputPipeline.bus.add_signal_watch()
  		self.outputPipeline.bus.connect("message::eos", self.on_eos)
  		self.outputPipeline.bus.connect("message::error", self.on_error)
  
  		self.log.debug('Launching Output-Pipeline')
  		self.outputPipeline.set_state(Gst.State.PLAYING)
  
  	def on_accepted(self, conn, addr):
  		self.log.debug('Adding fd %u to multifdsink', conn.fileno())
  		fdsink = self.outputPipeline.get_by_name('fd')
  		fdsink.emit('add', conn.fileno())
  
  		def on_disconnect(multifdsink, fileno):
  			if fileno == conn.fileno():
  				self.log.debug('fd %u removed from multifdsink', fileno)
  				self.close_connection(conn)
  
  		fdsink.connect('client-fd-removed', on_disconnect)
  
  	def on_eos(self, bus, message):
  		self.log.debug('Received End-of-Stream-Signal on Output-Pipeline')
  
  	def on_error(self, bus, message):
  		self.log.debug('Received Error-Signal on Output-Pipeline')
  		(error, debug) = message.parse_error()
  		self.log.debug('Error-Details: #%u: %s', error.code, debug)
  
new_contents: import logging
  from gi.repository import Gst
  
  from lib.config import Config
  from lib.tcpmulticonnection import TCPMultiConnection
  from lib.clock import Clock
  
  class AVPreviewOutput(TCPMultiConnection):
  	def __init__(self, channel, port):
  		self.log = logging.getLogger('AVPreviewOutput['+channel+']')
  		super().__init__(port)
  
  		self.channel = channel
  
  		if Config.has_option('previews', 'videocaps'):
  			vcaps_out = Config.get('previews', 'videocaps')
  		else:
  			vcaps_out = Config.get('mix', 'videocaps')
  
  		pipeline = """
  			intervideosrc channel=video_{channel} !
  			{vcaps_in} !
  			capssetter caps="video/x-raw,interlace-mode=interlaced" !
  			deinterlace !
  			video/x-raw,interlace-mode=progressive !
  			videorate !
  			videoscale method=nearest-neighbour !
  			{vcaps_out} !
  			jpegenc !
  			queue !
  			mux.
  
  			interaudiosrc channel=audio_{channel} !
  			{acaps} !
  			queue !
  			mux.
  
  			matroskamux
  				name=mux
  				streamable=true
  				writing-app=Voctomix-AVPreviewOutput !
  
  			multifdsink
  				blocksize=1048576
  				buffers-max=500
  				sync-method=next-keyframe
  				name=fd
  		""".format(
  			channel=self.channel,
  			acaps=Config.get('mix', 'audiocaps'),
  			vcaps_in=Config.get('mix', 'videocaps'),
  			vcaps_out=vcaps_out
  		)
  
  		self.log.debug('Creating Output-Pipeline:\n%s', pipeline)
  		self.outputPipeline = Gst.parse_launch(pipeline)
  		self.outputPipeline.use_clock(Clock)
  
  		self.log.debug('Binding Error & End-of-Stream-Signal on Output-Pipeline')
  		self.outputPipeline.bus.add_signal_watch()
  		self.outputPipeline.bus.connect("message::eos", self.on_eos)
  		self.outputPipeline.bus.connect("message::error", self.on_error)
  
  		self.log.debug('Launching Output-Pipeline')
  		self.outputPipeline.set_state(Gst.State.PLAYING)
  
  	def on_accepted(self, conn, addr):
  		self.log.debug('Adding fd %u to multifdsink', conn.fileno())
  		fdsink = self.outputPipeline.get_by_name('fd')
  		fdsink.emit('add', conn.fileno())
  
  		def on_disconnect(multifdsink, fileno):
  			if fileno == conn.fileno():
  				self.log.debug('fd %u removed from multifdsink', fileno)
  				self.close_connection(conn)
  
  		fdsink.connect('client-fd-removed', on_disconnect)
  
  	def on_eos(self, bus, message):
  		self.log.debug('Received End-of-Stream-Signal on Output-Pipeline')
  
  	def on_error(self, bus, message):
  		self.log.debug('Received Error-Signal on Output-Pipeline')
  		(error, debug) = message.parse_error()
  		self.log.debug('Error-Details: #%u: %s', error.code, debug)
  
subject: enforce an deinterlacer on the preview-outout