DZone Snippets: video code

Stream live video from the N800

jrobertson (James Robertson) — Sat, 04 Oct 2008 10:48:52 GMT

Source: Streaming video from built-in webcam - maemo wiki [maemo.org

Here's the script which encodes the video and executes on the N800 ...

file: rtpstreamer.sh



#!/bin/sh



VPORT=5434

APORT=5432

HOST=${1:-192.168.1.103}

gst-launch-0.10 v4l2src ! \

video/x-raw-yuv,width=176,height=144,framerate=\(fraction\)15/1 ! \

hantro4200enc stream-type=1 profile-and-level=1001 ! \

video/x-h263,framerate=\(fraction\)15/1 ! rtph263ppay mtu=1438 ! \

udpsink host=$HOST port=$VPORT dsppcmsrc ! queue ! \

audio/x-raw-int,channels=1,rate=8000 ! mulawenc ! rtppcmupay mtu=1438 ! \

udpsink host=$HOST port=$APORT

... and now the client config file to view the video

file: /tmp/n800.sdp



v=0

o=- 37 614155991 IN IP4 127.0.0.0

s=QuickTime

t=0 0

a=range:npt=now-

m=audio 5432 RTP/AVP 0

c=IN IP4 192.168.1.108

b=AS:63

m=video 5434 RTP/AVP 96

c=IN IP4 192.168.1.108

a=rtpmap:96 H263-2000/90000

a=fmtp:96

a=cliprect:0,0,144,176

a=framesize:96 176-144

IP addresses used: N800 = 192.168.1.108; Ubuntu = 192.168.1.103

To view the video stream Video Lan Client (VLC) was used on Ubuntu. Here's how to play the stream ...
vlc /tmp/n800.sdp

Here's a snapshot of the streaming video on Ubuntu [twitxr.com] taken from my mobile phone.

Resources:
- Chapter 2. Easy streaming [videolan.org]
- Chapter 6. Receive and save a stream [videolan.org]

Embed an OGG video on a web page

jrobertson (James Robertson) — Wed, 30 Jul 2008 14:36:44 GMT

This code was copied from an HTML page from Superman: The Arctic Giant [xiph.org]

See also another example of embedded OGG video with information about Saint Lucia [wikipedia.org]

Convert AVI to Theora Ogg

jrobertson (James Robertson) — Wed, 30 Jul 2008 14:20:31 GMT

Source: Help:Converting video - Wikimedia Commons | ffmpeg2theora

Don't forget to apt-get install ffmpeg2theora



ffmpeg2theora nuxified.avi

Note the OGG file size was only 7.2KB compared to the AVI file size 22.5KB (produced from the post 'Convert an animation into a video with ffmpeg' [dzone.com])

Convert an animation into a video with ffmpeg

jrobertson (James Robertson) — Wed, 30 Jul 2008 13:59:59 GMT

source: Create video animations with Inkscape, ImageMagick and FFmpeg | Nuxified GNU/Linux Help Forums [nuxified.org]



ffmpeg -r 12 -i nuxified%05d.png -y -an nuxified.avi

PNG preserves the information in vector graphics while still keeping the file size low. I tried the above script with JPG and the AVI file size was 54.9KB, I tried the same thing with PNG and the AVI file size was only 22.5KB.

References:
- Making Movies - PyMolWiki [pymolwiki.org]
- [MEncoder-users] Trouble when making a movie from *.png files [mplayerhq.hu]
- FFmpeg [wikipedia.org]
- MEncoder [wikipedia.org]
- Animating PNG files « The Daily Photon [wordpress.com]

I can't be bothered going downstairs to watch the daily show

tunah (Sam McCall) — Sun, 18 Nov 2007 06:44:14 GMT

scraper.rb - scrapes metadata from thedailyshow.com.
Just run it - creates videos/index.yml



#!/usr/bin/ruby



require 'rubygems'

require 'leecher'

require 'open-uri'

require 'hpricot'



class Scraper

	SEARCH_PAGE="http://www.thedailyshow.com/tds_files/includes/search/search_results.jhtml"

	def scrape_day(site, date, force=false)

		return if site.skip.include?(date) and not force

		url = sprintf("#{SEARCH_PAGE}?searchterm=%02d-%02d-%04d",date.month,date.day,date.year)

		puts "Fetching #{url}" if $DEBUG



		data = open(url) {|f| f.read }

		h = Hpricot(data)



		# can't use a real xpath - they all use an _id_ istead of a class

		results = (h/"div").find_all {|x| x['id'] == "videoListItem_1" }

		results.each {|result|

			url = result.at("a[1]")['href']

			vid = if url =~ /videoId=(\d+)/

				$1.to_i

			else

				raise "Failed to parse link #{url}"

			end



			title = ((result/"a")[1]/"text()").to_s

			date = Date.parse((result/"a[@onclick][1]/text()").to_s)



			descr = result/"div.video_description"

			description = (descr/"div[1]/text()").to_s

			tags = (descr/".tags/a/text()").map {|x| unescape(x.to_s) }

			

			vid = Video.new(site, vid, date, unescape(title), unescape(description), tags)

			puts vid

		}

	

		results.length

	end



	def unescape(t)

		t.gsub(/&([^;]{1,5});/) {|ent|

			case $1

				when /^#(\d+)$/

					[$1.to_i].pack('C')

				when /^#x([0-9a-zA-Z]+)$/

					[$1].pack('H2')

				when 'amp'

					'&'

				when 'gt'

					'>'

				when 'quot'

					'"'

				when 'apos'

					"'"

				when 'lt'

					'<'

				else

					$stderr.puts "Unknown entity #{$1.inspect}"

					'?'

			end

		}

	end

end



if __FILE__ == $0

	Site.load

	tds = Site.sites.find {|s| s.short_name == "tds" }

	tds ||= Site.new("The Daily Show","tds")



	day = Date.today

	start = Date.new(1999)



	counter=0



	s = Scraper.new

	while day >= start

		results = s.scrape_day(tds, day)

		puts "#{results} results for #{day}" if results # else skipped



		# Mark days as done once we've scraped them a month after air

		if (Date.today - day) > 30 and not results.nil?

			tds.skip!(day)

		end



		day -= 1

		unless results.nil? or results.zero?

			Site.save if (counter += 1)%10 == 0

		end

	end

	Site.save

end

leecher.rb - downloads/searches/plays videos
./leecher.rb [download/list/play] [searchterm ... ]
Search terms can be
date: 2007 or 2007-10 or 2007-10-01
tag: interview
id: 31723
already downloaded?: downloaded or !downloaded



#!/usr/bin/ruby



MEDIA_PLAYER = %w{mplayer -fs}



require 'rubygems'

require 'open-uri'

require 'rexml/document'

require 'rexml/xpath'

require 'fileutils'

require 'yaml'

require 'rio'

require 'set'



class Site

	class << self

		attr_reader :base

		attr_reader :alternates

		attr_reader :sites

		

		def init

			unless self.base or self.sites

				@base = "./videos"

				@alternates = []

				@sites = []

			end

		end



		def load(stream=nil)

			if stream

				stuff = YAML::load(stream)

				@base = stuff['base'] || "./videos"

				@sites = stuff['sites'] || []

				@alternates = stuff['alternates'] || []

			else

				init

				begin

					File.open(File.join(base,'index.yml')) {|f|

						load(f)

					}

				rescue Errno::ENOENT

					$stderr.puts "Warning, no database found, starting a new one"

				end

			end

		end

		

		def save(stream=nil)

			if stream

				YAML::dump({'base' => base, 'sites' => sites, 'alternates' => 'alternates'},stream)

			else

				File.open(File.join(base,'index.yml_'),'w') {|f|

					save(f)

				}

				FileUtils.mv(File.join(base,'index.yml_'),File.join(base,'index.yml'))

			end

		end



		def each(&block)

			sites.each(&block)

		end

	end



	def initialize(name, short_name=name)

		Site.init

		@videos = {}

		@name, @short_name = name, short_name

		@skip = Set.new

		Site.sites << self

	end



	attr_reader :videos

	attr_reader :name

	attr_reader :short_name

	attr_reader :skip



	def directory

		File.join(Site.base, short_name)

	end

	def directory_alternates

		Site.alternates.map {|d| File.join(d, short_name) }

	end



	def ensure_dir_exists!

		FileUtils.mkpath(directory)

	end



	def <<(vid)

		self.videos[vid.id] = vid

	end



	def skip!(date)

		self.skip << date

	end



	def [](id)

		self.videos[id]

	end



	def to_s

		name

	end



	def each 

		self.videos.each {|k,v| yield v }	

	end

end



class Video

	attr_reader :tags

	attr_reader :site

	attr_reader :id

	attr_reader :date

	attr_reader :title

	attr_reader :description



	def initialize(site, id, date=nil, title = nil, description=nil, tags=[]) 

 		@site = site

		@id = id

		@title = title

		@tags = tags

		@date = date

		@description = description



		site << self

	end



	def filename

		site.directory_alternates.map{|x| 

			File.join(x,"#{id}.flv")

		}.find {|f| 

			File.exists?(f) 

		} || File.join(site.directory, "#{id}.flv")

	end



	def downloaded?

		File.exists?(filename)

	end



	def download

		download! unless downloaded?

	end



	SHARED_DATA = "http://www.comedycentral.com/sitewide/video_player/shared/data"

	def download!

		site.ensure_dir_exists!

		url = download_url()

		begin

			rio(url) > rio(filename)

			File.size(filename)

		rescue Exception => x

			begin

				File.delete(filename)

			rescue Exception

			end

			raise x

		end

	end



	def to_s 

		sprintf("[%1s %7d - %s - %s - %20s]",(downloaded?? 'D' : ' '), id, date, site, title) 

	end



	def download_url

		manifest = open("#{SHARED_DATA}/flv_xml_gen.jhtml?ml_video=#{id}&hiLoPref=hi") {|f| f.read }

		doc = REXML::Document.new(manifest)

		REXML::XPath.first(doc, "/package/video/item/src/text()").to_s

	end

end



class Filter

	class << self

		def method_missing(sym,*args,&block)

			if sym.to_s =~ /^by/

				new.send(sym,*args,&block)

			else

				super

			end

		end

	end



	def initialize(parent=nil,&block)

		@parent = parent

		@test = block

	end

	

	def [](video)

		case video

			when Video

				video if (@test.nil? or @test[video]) and (@parent.nil? or @parent[video])

			when Site

				if block_given?

					video.each {|v| yield v if self[v] }

				else

					video.find_all {|v| self[v] }

				end

			else

				raise ArgumentError

		end

	end



	def each(&block)

		Site.each {|show| self.send(:[], show, &block) }

	end



	def filter(&block)

		Filter.new(self,&block)

	end



	def by_downloaded(dl=true)

		filter {|v| v.downloaded? == !!dl }

	end



	def by_date(y, m=nil, d=nil)

		if m.nil? and d.nil?

			filter {|v| v.date and v.date.year == y }

		elsif d.nil?

			filter {|v| v.date and v.date.year == y and v.date.month == m }

		else

			filter {|v| v.date and v.date.year == y and v.date.month == m and v.date.day == d }

		end

	end



	def by_id(vid)

		filter {|v| v.id == vid }

	end



	def by_tag(tag)

		filter {|v| v.tags.include? tag }

	end



	def by_text(text) 

		filter {|v| 

			v.title && v.title.downcase.include?(text.downcase) or 

			v.description && v.description.downcase.include?(text.downcase) or

			v.tags.include? text

		}

	end



	def by(arg)

		arg = arg.to_s

		case arg

			when 'downloaded'

				by_downloaded(true)

			when '!downloaded'

				by_downloaded(false)

			when /^(\d{4})$/

				by_date($1.to_i)

			when /^(\d{4})-(\d{1,2})$/

				by_date($1.to_i, $2.to_i)

			when /^(\d{4})-(\d{1,2})-(\d{1,2})$/

				by_date($1.to_i, $2.to_i, $3.to_i)

			when /^\d{5,}$/

				by_id(arg.to_i)

			else

				by_text(arg)

		end

	end

end



if __FILE__ == $0

	command = ARGV.shift or raise "Usage: leecher  [filters...]"

	action = case command.downcase

		when 'download'

			proc {|v| 

				puts "Fetching #{v}" unless v.downloaded?

				begin

					v.download

				rescue OpenURI::HTTPError => x

					$stderr.puts "Download failed, skipping: #{x}"

				rescue Errno::ENOENT => xm

					$stderr.puts "Download failed, skipping: #{x}"

				end

			}

		when 'list'

			proc {|v|

				puts "#{v} #{v.tags.join(', ')}"

			}

		when 'play'

			proc {|v|

				puts v

				system(*MEDIA_PLAYER, v.filename)

			}

		else

			raise "Unknown command #{command}"

	end



	filter = ARGV.inject(Filter.new) {|f, arg| f.by(arg)}



	Site.load

	filter.each(&action)

end

Convert a video file to an audio file (.mp4 to .mp3)

jrobertson (James Robertson) — Sat, 13 Oct 2007 10:37:27 GMT

Convert an mp4 file to avi, then to mp3 (including mixing the stereo down to mono). This code was executed from the command-line on Ubuntu 7.04.



mencoder video.mp4 -ovc lavc -vf scale=123:100 -oac lavc -o video.avi

ffmpeg -i video.avi -ac 1 audio1.mp3

Bash - 3gpToMpeg

whitetiger () — Fri, 03 Nov 2006 03:26:13 GMT



mencoder video.3gp -o video.mpg -oac pcm -ovc lavc -lavcopts vcodec=mjpeg:mbd=1:vbitrate=1800

Java - JMF Simple Filter

whitetiger () — Wed, 01 Nov 2006 06:00:23 GMT



import java.awt.Dimension;



import javax.media.Buffer;

import javax.media.Effect;

import javax.media.Format;

import javax.media.ResourceUnavailableException;

import javax.media.format.RGBFormat;



public class SimpleFilter implements Effect

{

	protected Format inputFormat = null;

	protected Format outputFormat = null;

	

	protected Format[] inputFormats = null;

	protected Format[] outputFormats = null;

	

	public AngelMotionCodec()

	{

		inputFormats = new Format[]{ new RGBFormat(null, Format.NOT_SPECIFIED, Format.byteArray, Format.NOT_SPECIFIED, 24, 3, 2, 1, 3, Format.NOT_SPECIFIED, Format.TRUE, Format.NOT_SPECIFIED) };

		outputFormats = new Format[]{ new RGBFormat(null, Format.NOT_SPECIFIED, Format.byteArray, Format.NOT_SPECIFIED, 24, 3, 2, 1, 3, Format.NOT_SPECIFIED, Format.TRUE, Format.NOT_SPECIFIED) };

	}

	

	/****** Codec ******/

	public Format[] getSupportedInputFormats()

	{

		return inputFormats;

	}



	public Format[] getSupportedOutputFormats(Format input)

	{

		if(input != null)

		{

			if(matches(input, inputFormats) != null)

				return new Format[]{ outputFormats[0].intersects(input) };

			else

				return new Format[0];

		}

		

		return outputFormats;

	}



	public int process(Buffer input, Buffer output)

	{

		// Swap tra input & output

		Object tmp = input.getData();

		

		input.setData(output.getData());

		output.setData(tmp);

		

		return BUFFER_PROCESSED_OK;

	}



	public Format setInputFormat(Format input)

	{

		inputFormat = input;

		

		return input;

	}



	public Format setOutputFormat(Format output)

	{

		if(output != null || matches(output, outputFormats) != null)

		{

			RGBFormat inRGB = (RGBFormat) output;

			

			Dimension size = inRGB.getSize();

			int maxDataLength = inRGB.getMaxDataLength();

			int lineStride = inRGB.getLineStride();

			int flipped = inRGB.getFlipped();

			

			if(size == null)

				return null;

			

			if(maxDataLength < size.width*size.height*3)

				maxDataLength = size.width*size.height*3;

			

			if(lineStride < size.width*3)

				lineStride = size.width*3;

			

			if(flipped != Format.FALSE)

				flipped = Format.FALSE;

			

			outputFormat = outputFormats[0].intersects(new RGBFormat(size, maxDataLength, inRGB.getDataType(), inRGB.getFrameRate(), inRGB.getBitsPerPixel(), inRGB.getRedMask(), inRGB.getGreenMask(), inRGB.getBlueMask(), inRGB.getPixelStride(), lineStride, flipped, inRGB.getEndian()));

			

			return outputFormat;

		}

		

		return null;

	}

	/****** Codec ******/



	/****** PlugIn ******/

	public void close()

	{



	}



	public String getName()

	{

		return "Simple-Filter";

	}



	public void open() throws ResourceUnavailableException

	{



	}



	public void reset()

	{



	}

	/****** PlugIn ******/



	/****** Controls ******/

	public Object getControl(String controlType)

	{

		return null;

	}



	public Object[] getControls()

	{

		return null;

	}

	/****** Controls ******/

	

	/****** Utility ******/

	private Format matches(Format in, Format[] out)

	{

		if(in != null && out != null)

		{

			for(int i=0, cnt=out.length; i			{

				if(in.matches(out[i]))

					return out[i];

			}

		}

		

		return null;

	}

	/****** Utility ******/

}

Java - Example Very Simple Player (JMF)

whitetiger () — Fri, 27 Oct 2006 15:53:37 GMT

// Main Class



package org.jmf.example;



import javax.swing.JDialog;

import javax.swing.JFrame;

import javax.swing.UIManager;

import javax.swing.UnsupportedLookAndFeelException;

import javax.swing.plaf.metal.MetalLookAndFeel;



public class ExampleJMF

{

	public static void main(String[] args)

	{

		JFrame.setDefaultLookAndFeelDecorated(true); 

		JDialog.setDefaultLookAndFeelDecorated(true);

		

		try

		{

			UIManager.setLookAndFeel(new MetalLookAndFeel());

		}

		catch(UnsupportedLookAndFeelException e)

		{

			e.printStackTrace();

		}

		

		new exampleFrame();

	}

}

// Frame Class



package org.jmf.example;



import java.awt.Toolkit;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;



import javax.swing.JFrame;



public class exampleFrame extends JFrame

{

	private static final long serialVersionUID = 1L;

	

	public exampleFrame()

	{

		super("JMF - Example...");

		

		setSize(400, 300);

		setLocation((Toolkit.getDefaultToolkit().getScreenSize().width - getWidth())/2, (Toolkit.getDefaultToolkit().getScreenSize().height - getHeight())/2);

		

		addWindowListener(new WindowAdapter()

		{

			public void windowClosing(WindowEvent evt)

			{

				System.exit(0);

			}

		});

		

		setContentPane(new examplePanel());

		setVisible(true);

	}

}

// Panel Class



package org.jmf.example;



import java.awt.Component;

import java.awt.Graphics;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.IOException;

import java.net.MalformedURLException;

import java.net.URL;



import javax.media.ControllerEvent;

import javax.media.ControllerListener;

import javax.media.Manager;

import javax.media.NoPlayerException;

import javax.media.Player;

import javax.media.RealizeCompleteEvent;

import javax.swing.JPanel;



public class examplePanel extends JPanel implements ActionListener, ControllerListener

{

	private static final long serialVersionUID = 1L;

	

	private Component visualComponent;

	private Player player;

	

	public examplePanel()

	{

		try

		{

			player = Manager.createPlayer(new URL("file:///tmp/a.mpg"));

			player.addControllerListener(this);

			

			player.start();

		}

		catch(NoPlayerException e)

		{

			e.printStackTrace();

		}

		catch(MalformedURLException e)

		{

			e.printStackTrace();

		}

		catch(IOException e)

		{

			e.printStackTrace();

		}

	}

	

	public void paintComponent(Graphics g)

	{

		super.paintComponent(g);

	}



	public void actionPerformed(ActionEvent e)

	{



	}



	public void controllerUpdate(ControllerEvent c)

	{

		if(player == null)

			return;

		

		if(c instanceof RealizeCompleteEvent)

		{

			if((visualComponent = player.getVisualComponent()) != null)

				add(visualComponent);

		}

	}

}

Load a page after video finishes playing

uchafu (Robert Douglas) — Mon, 25 Sep 2006 12:04:23 GMT

You can do this using Windows Media Player, adding javascript to the page to handle the playStateChange event to detect when the video finishes playing. (Should work with any video type that Windows Media Player supports.)

http://www.mioplanet.com/rsc/embed_mediaplayer.htm
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmplay10/mmp_sdk/playerplaystatechange.asp