intro to podcasting great lakes broadcasting conference 14 march 2006
TRANSCRIPT
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Intro to PodcastingGreat Lakes Broadcasting Conference
14 March 2006
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Harold Beer - WKARGreat Lakes Broadcasting Conference
14 March 2006
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Podcast• a portmanteau
• coined from iPod and broadcasting in 2004• New Oxford American Dictionary - word of the year
2005• Defined: a digital recording of a radio broadcast or
similar program, made available on the Internet for downloading to a personal audio player
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got content?
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Elements of a podcast
• Metadata – information about information• ID3 tags – best-known ‘standard’• Song title, artist, album, and so on; But what about
radio programs, or news features?
• Audio file Usually mp3, but could be Windows Media, Ogg-
Vorbis – precluded by convention and the embedded base of mp3 players
• RSS – Really Simple Syndication• Not just for audio• Uses XML
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Elements of a podcast
• XML eXtensible Markup Language simultaneously
human- and machine-readable format, easily constructed
• SubscriptionNot like a print subscription, but an instruction to
check to see if new content is available and download it, if it is
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WKAR – podcast implementation
• June 2005• Anger can be positive
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Deconstructing NPRWe can get together next week, but we'll need Harold in on it. He's not in 'til Monday, so we can't set a date yet.For discussion:The podcasts indexed by The NPR/PRI/APM demonstration project (our page http://wkar.org/podcast/) follow a format with these elements:
Music tag/theme"This is..." program name and descriptionsponsor support messageProgram as airedthanks for listening mssgsponsor/support messagemusic tag/theme
except the GLRC podcasts do not have a sponsor message
item 1/7 is the same for all podcasts in this group, whether they are from PRI, NPR, GLRC, etc.
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Automated capture
• Regular, recurring events must be automated• Shell scripts and cron (one minute granularity)• Upcut problem: takes a while to start up mp3
encoder• Solved by: starting a minute early and sleeping for 58
seconds until starting the capture would happen at exactly the correct time.
• ID3 tags• Title – Episode Title or summary of content• Artist – Producer/Host and copyright holder• Album – Title of Series or show name
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Automated capture
• ID3 Tags• Just like MPS: HD Radio• Tag metadata drawn from mySQL database using
PHP script, utilizing the same data we use for our streaming file archives.
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Automated packaging - mp3cat
1. audio ‘signature’
2. title announcement
3. funding credit
4. program
5. thank you for listening
6. funding credit
7. audio ‘signature’
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Automated RSS file creation
• Metadata - using PHP, draw from mySQL database, and create RSS file.
• RSS file is key - provides metadata to feed readers (iTunes, Juice, et al)
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Are you being served?• Podcasts are a download, usually from a web
(http) server. RSS files are XML files and can be delivered by the same server.
• 550 MHz Celeron, 192 MB RAM, 250 GB HD• LAME process only uses 37% of processor to
encode 64 - 160 kbps mp3’s• concatenation and tagging can use all of the
processor, but can play nice if needed• can saturate 100Mbps Ethernet
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Content possibilities• Locally produced programs to which we hold
the copyrights (e.g. Off The Record, Quizbusters)
• Educational purposes - IVS supports classroom activities, ancillary information
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What does it look like?
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What does it look like?
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What does it look like?
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What does it look like?
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More information• This presentation at:
• http://msu.edu/~beer/
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More information• Useful tools -
• lame - mp3 encoder• perl - scripting language• PHP - scripting language• mp3cat - mp3 concatenator• mySQL - database
• Useful websites:• feedvalidator.com - RSS validation• id3.org - id3 tag HQ• blogs.law.harvard.edu/tech/rss - rss spec. page
Special thanks to Bill Richards, WKAR Webmaster