MPEG LAYER 3 AUDIO (.mp3)
Most common audio format for just about everything online
Format used for SoundCloud and Amazon Music store
High Quality: 320 kbps (2.5 MB per minute)
Low Quality: 128 kbps (1 MB per minute)
<format>
<output>mp3</output>
<audio_bitrate>128k</audio_bitrate>
<audio_sample_rate>44100</audio_sample_rate>
<audio_channels_number>2</audio_channels_number>
<audio_codec>libmp3lame</audio_codec>
<file_extension>mp3</file_extension>
</format>
WIFI AAC (.m4a)
Dolby AAC-LC (Low Complexity) format for iTunes, YouTube, Vimeo
High Quality: 256 kbps (1.9 MB per minute)
Low Quality: 128 kbps (1 MB per minute)
<format>
<output>m4a</output>
<audio_bitrate>128k</audio_bitrate>
<audio_sample_rate>44100</audio_sample_rate>
<audio_channels_number>2</audio_channels_number>
<audio_codec>dolby_aac</audio_codec>
<file_extension>m4a</file_extension>
</format>
MOBILE AAC (.m4a)
Dolby HE-AAC (High Efficiency) low bitrate format for mobile phones
64 kbps stream (0.5 MB per minute)
<format>
<output>m4a</output>
<audio_bitrate>64k</audio_bitrate>
<audio_sample_rate>44100</audio_sample_rate>
<audio_channels_number>2</audio_channels_number>
<audio_codec>dolby_heaac</audio_codec>
<file_extension>m4a</file_extension>
</format>
OGG AUDIO (.ogg)
Open source audio format using Vorbis codec
High Quality: 320 kbps (2.5 MB per minute)
Low Quality: 128 kbps (1 MB per minute)
Better quality than MP3. Supported by Chrome, Firefox, and Android
<format>
<output>ogg</output>
<audio_bitrate>128k</audio_bitrate>
<audio_sample_rate>44100</audio_sample_rate>
<audio_channels_number>2</audio_channels_number>
<audio_codec>libvorbis</audio_codec>
<file_extension>ogg</file_extension>
</format>
DOLBY 5.1 SURROUND (.ac3)
Professional mix for theaters and DVD/Blu-Ray
High Quality: 448 kbps (3.4 MB per minute)
Low Quality: 384 kbps (2.9 MB per minute)
<format>
<output>ac3</output>
<audio_bitrate>384k</audio_bitrate>
<audio_sample_rate>48000</audio_sample_rate>
<audio_channels_number>6</audio_channels_number>
<audio_codec>ac3</audio_codec>
<file_extension>ac3</file_extension>
</format>
Tuesday, July 21, 2015
Monday, July 20, 2015
Human Eye vs. Framerates
Most cheap LCD monitors lock at 60Hz, limiting their framerate to 60 FPS. Pro gaming monitors can go up to 120Hz to support 120 FPS.
High speed motion example http://testufo.com/#test=framerates&count=3&background=none&pps=1440
The USAF, in testing their pilots for visual response time, used a simple test to see if the pilots could distinguish small changes in light. In their experiment a picture of an aircraft was flashed on a screen in a dark room at 1/220th of a second. Pilots were consistently able to "see" the afterimage as well as identify the aircraft. This simple and specific situation not only proves the ability to percieve 1 image within 1/220 of a second, but the ability to interpret higher FPS.
In the U.S., analog video originally had a frame rate of 30 and a line rate of 15,750 (525 horizontal lines) Also early in the specification of television it was decided that the picture would be amplitude modulated on one carrier and the sound would be frequency modulated on a second higher frequency carrier separated enough to prevent the two signals from interfering with each other. What this means is that a television essentially needed two radio receivers comprised of two mixers, two local oscillators, two IF amplifiers, and two detectors. One set of circuits for picture, and one set for sound.
The difficulty in this scheme is getting the two local oscillators to change frequency exactly the right amount every time the user changed channels. This is further exacerbated by the inherent lack of stability of oscillators at these high frequencies. There were no inexpensive phased lock loops and digital synthesizers in the 1950s.
To eliminate the difficulty and expense of building two oscillators that would track each other and not drift apart it was decided that the tolerance of frequency separation could be held more precisely at a single location, the TV transmitter. It was further decided to separate the visual and audio signals by exactly 4.5 MHz. This allowed set manufacturers to design TV sets with inter-carrier sound detection, or a carrier within a carrier.
Glydeck goes into more detail at http://glydeck.blogspot.com/2011/07/why-do-we-have-2997-frame-rates-and-not.html
High speed motion example http://testufo.com/#test=framerates&count=3&background=none&pps=1440
The USAF, in testing their pilots for visual response time, used a simple test to see if the pilots could distinguish small changes in light. In their experiment a picture of an aircraft was flashed on a screen in a dark room at 1/220th of a second. Pilots were consistently able to "see" the afterimage as well as identify the aircraft. This simple and specific situation not only proves the ability to percieve 1 image within 1/220 of a second, but the ability to interpret higher FPS.
Sample of GoPro camera shooting 120 FPS
Why is NTSC analog video set to 29.97 FPS?
In the U.S., analog video originally had a frame rate of 30 and a line rate of 15,750 (525 horizontal lines) Also early in the specification of television it was decided that the picture would be amplitude modulated on one carrier and the sound would be frequency modulated on a second higher frequency carrier separated enough to prevent the two signals from interfering with each other. What this means is that a television essentially needed two radio receivers comprised of two mixers, two local oscillators, two IF amplifiers, and two detectors. One set of circuits for picture, and one set for sound.
The difficulty in this scheme is getting the two local oscillators to change frequency exactly the right amount every time the user changed channels. This is further exacerbated by the inherent lack of stability of oscillators at these high frequencies. There were no inexpensive phased lock loops and digital synthesizers in the 1950s.
To eliminate the difficulty and expense of building two oscillators that would track each other and not drift apart it was decided that the tolerance of frequency separation could be held more precisely at a single location, the TV transmitter. It was further decided to separate the visual and audio signals by exactly 4.5 MHz. This allowed set manufacturers to design TV sets with inter-carrier sound detection, or a carrier within a carrier.
Glydeck goes into more detail at http://glydeck.blogspot.com/2011/07/why-do-we-have-2997-frame-rates-and-not.html
Friday, July 17, 2015
Thursday, July 16, 2015
Wednesday, July 15, 2015
Vidly.com test embed
-------------
<iframe frameborder="0" allowfullscreen webkitallowfullscreen mozallowfullscreen msallowfullscreen width="640" height="360" name="vidly-frame" src="http://s.vidly.com/embeded.html?link=6t4l1d&new=1&autoplay=false"><a target="_blank" href="http://vidly.com/6t4l1d"><img src="http://vidly.com/6t4l1d/poster" /></a></iframe>
Monday, July 6, 2015
Successful People by Oliver Emberton
I'll give you the unpopular answer:
All those people were accomplishing improbable things long before the world had given them permission.
Steve Jobs once called up the CEO of multinational mega-corp HP and talked himself into a summer job. He was 12. Steve later travels to India for spiritual enlightenment, drops out of college and founds Apple by age 21.
Bill Gates started a business aged 15, developing software that monitored traffic patterns, and made $20,000. He graduates scoring 1590 out of 1600 on the college SAT test, and founds Microsoft aged 22.
Elon Musk wrote a video game called Blastar aged 12, selling it for around $500. Being born in South Africa, at age 17, he decided he needed to live in the US and flew solo to Canada with no home or job, and survived doing hard labour on farms and cleaning out boilers, working his way into University aged 19 and earning two degrees in economics and physics.
Richard Branson started his first two businesses at age 16 from the crypt of a church. By age 22 he set up a music label and recording studio, where his first signed artist Mike Oldfield recorded the hit song Tubular Bells.
Before he was 21, Peter Thiel was a US Chess Master, one of the highest ranked under-21 players in the country. He also had time to found The Stanford Review aged 19.
I sure as hell don't deserve to be in the same list (well – not yet) – but I was programming aged 8, wrote my own operating system aged 16, and founded my business aged 21. I'm willing to bet that the other people you listed that I don't know had their own share of unconventional accomplishments.
It's a popular myth that you can't tell if something is going to be successful early. Certainly early success doesn't guarantee late success, and sometimes – very rarely – success can come from nowhere. But actually, most things that end well start off well. You might have looked at Elon Musk aged 18 and seen a penniless kid cleaning goop out of pipes, but his internal fortitude had already accomplished more than most would live to imagine. He was already a success – it just took a little time for reality to catch up.
So you want to know what to do between age 10 and 22? Accomplish things. Don't wait for the world. You want it to be the one doing the catching up. -- Oliver Emberton
3,152 upvotes
All those people were accomplishing improbable things long before the world had given them permission.
Steve Jobs once called up the CEO of multinational mega-corp HP and talked himself into a summer job. He was 12. Steve later travels to India for spiritual enlightenment, drops out of college and founds Apple by age 21.
Bill Gates started a business aged 15, developing software that monitored traffic patterns, and made $20,000. He graduates scoring 1590 out of 1600 on the college SAT test, and founds Microsoft aged 22.
Elon Musk wrote a video game called Blastar aged 12, selling it for around $500. Being born in South Africa, at age 17, he decided he needed to live in the US and flew solo to Canada with no home or job, and survived doing hard labour on farms and cleaning out boilers, working his way into University aged 19 and earning two degrees in economics and physics.
Richard Branson started his first two businesses at age 16 from the crypt of a church. By age 22 he set up a music label and recording studio, where his first signed artist Mike Oldfield recorded the hit song Tubular Bells.
Before he was 21, Peter Thiel was a US Chess Master, one of the highest ranked under-21 players in the country. He also had time to found The Stanford Review aged 19.
I sure as hell don't deserve to be in the same list (well – not yet) – but I was programming aged 8, wrote my own operating system aged 16, and founded my business aged 21. I'm willing to bet that the other people you listed that I don't know had their own share of unconventional accomplishments.
It's a popular myth that you can't tell if something is going to be successful early. Certainly early success doesn't guarantee late success, and sometimes – very rarely – success can come from nowhere. But actually, most things that end well start off well. You might have looked at Elon Musk aged 18 and seen a penniless kid cleaning goop out of pipes, but his internal fortitude had already accomplished more than most would live to imagine. He was already a success – it just took a little time for reality to catch up.
So you want to know what to do between age 10 and 22? Accomplish things. Don't wait for the world. You want it to be the one doing the catching up. -- Oliver Emberton
3,152 upvotes
Thursday, July 2, 2015
JW player test for Srini
--------------
<script type="text/javascript">
jwplayer('playerbamloMciEzWS').setup({
file: 'http://markusbucket.s3.amazonaws.com/14688_srini_dolbytest/da9e3e73de441ddaedd8537dcd0d5065_266645_130638208.mp4',
image: '//www.longtailvideo.com/content/images/jw-player/lWMJeVvV-876.jpg',
title: 'Test for Srini',
width: '100%',
aspectratio: '16:9'
});
</script>
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