FREE MOBILE CLOUD COMPUTING
CONCEPTS - TRAINING_MODULES_WITH_TONS_OF_VIDEOS
2.01.2011 Post by Sean
Pitt of Clear Cloud Networks...to probe into the most common misconceptions in the entire concept of Internet and LAN and
WAN Streaming Videos
Streaming
Media Common Facts and Important Stuff for the Cloud Pro to Know....
Best to Bookmark
- or Save in your Favorites - this FREE Cloud Training site - we POST DAILY with new Training_Modules
and FREEVIDEOS America's Largest!
Why does
my playback get interrupted?
Interruptions can come from either the source's site throughput, or the throughput
of your internet service provider (ISP). (Throughput here refers
to the rate at which information can be transmitted). Even if you have a high-bandwidth internet
connection, if the source from which you are downloading is slow, it will not reach you at the speed of your network. And
even if the source has a high bandwith, if the source is high in demand and many people are
accessing it at once, it will tend to slow down the speed of their network.
A
stream is a way of thinking about digital information for which there may be no ending point. The most conventional form of
digital information is the file. Files always have a beginning and an end, but streams may or may not, and therefore software
which uses streams must not require finding the end of the file in order to process it. Streams are usually delivered in packets
which are self-contained, and usually allow seeking (i.e. fast forward) for further points in the streams. They are particularly
important when dealing with large sizes of digital information, so most video and audio on the Internet is streamed.
However,
most sites will place an upper limit on the amount of people who can access a source at once, and if this limit is placed
at a level appropriate to the medium, this will allow the item to be accessed at a speed which won't cause slowdowns. And
this will depend on the site - some sites will not have provided this fine-tuning.
However, there are other factors that create slowdowns.
Cable access will slow down when more people are using it, and will cause your bandwith to contract;
DSL is not as liable to this. Some service providers, though, may provide penalties for high-bandwith use, and subtract from your bandwidth if they deem you a problem (usually for excessively
long periods of constant downloads). And the Internet in general can be subject to slowdowns - it is a highly connnected
series of networks at which key nodes can be subject to denial-of-service attacks, hacker malfeasance, and general traffic
fluctuations, etc.
Like a freeway, if too many are trying use it, there are traffic jams.
And in some situations, your own computer could be the culprit. Malware
such as viruses, worms, spambots, adware could cause slowdowns
in general performance, and other problems with hard drives, memories, and other configurations can slow performance.
Players that read streaming media must first process a certain amount of the stream (at
least one packet) in order to display anything. The buffer is a word for computer memory that stores digital information that
will later be processed. The computer memory can either be in the form of RAM or a partial temporary file that the media player
constructs from the stream.
Buffers in streaming media players usually will store a certain number of seconds
of information, to avoid jerky on-off playback; if the media player runs at a certain rate, and there is some latency (i.e.
intermittent interruptions or slower downloading) in the stream, the display process will run more smoothly if there is a
fair amount of information in the buffer before the playing begins. Of course, if the rate at which the stream comes in is
too slow, there will inevitably be some interruptions in the playback, but if there is a lot stored in the buffer, the periods
of play before interruptions will be long enough to be intelligible.
What media types
are there?
I won't go
into all media types, only those which are common enough on the Internet.
Video Types:
MPEG (.mpeg, .mpg files)
is a media type that is not proprietary in type and was created by a consortium, and is a streaming format. AVI (.avi) is a media format originally created
by Microsoft, but is not proprietary, and is very common on the web; AVI is generally not a
streaming format, although there are some kind that do stream.
Microsoft has its own kinds of media, with the .asf
and .wmv video formats and the .wmp
audio format.
Real
Networks has .ra and .rm video and audio files.
Apple (with QuickTime)
has .mov, .qt, .3gp
and .mp4 files.
Macromedia (with Flash/Shockwave) has its own format
(.swf and .flv) that requires
the Flash plugin to run, and also is used as a convenient way of delivering other media types
(notably on YouTube).
Nullsoft Streaming Video (.nsv)
and Shoutcast, IceCast (GNU GPL/Open
Source version of Shoutcast), Live365, are all formats that are used for streaming audio and
video.
Audio Types:
The creation of MP3 compression (.mp3) created a revolution in audio formats that
changed the music industry, as music files became easily accessible from the Internet. MP3 has proprietary encoders, but there
are plenty of free encoders available, and there are no limits on MP3 playback. .wmp
files are proprietary audio files from Microsoft.
.ra and .rm
are proprietary audio files from Real Networks.
OggVorbis
(.ogg) is a compression format that offers higher-quality than .mp3. acc Plus (.aac, .mp3) is
a variant similar to the .mp3 encoding scheme that offers much higher quality at smaller sizes than .mp3
files.
Winamp
Media Player - Winamp
is a fast, flexible, high-fidelity music/video player for Windows. Winamp supports playback
of many audio (MP3, OGG, AAC, WAV,
MOD, XM, S3M, IT, MIDI, etc) and video types (AVI, ASF,
MPEG, NSV), custom appearances called skins (supporting both classic
Winamp 1.x/2.x skins and Winamp 3 freeform
skins), audio visualization and audio effect plug-ins (including two industry dominating visualization plug-ins), an advanced
media library, Internet radio and TV support, CD ripping, and CD burning.
VLC
Media Player - VLC
(initially VideoLAN Client) is a highly portable multimedia player for various audio and video
formats (MPEG-1, MPEG-2, MPEG-4,
DivX, mp3, ogg, ...) as well as DVDs, VCDs,
and various streaming protocols. It can also be used as a server to stream video.
Real Alternative Player - Real Alternative will allow
you to play RealMedia files without having to install RealPlayer/RealOne Player. Supported: RealAudio (.ra
.rpm), RealMedia (.rm .ram .rmvb .rpx
.smi .smil), RealText (.rt), ReadPix (.rp), RealMedia embedded in webpages.
Media Player Classic - A great all-in-one player based on the Windows
Media Player 6.4. Supports most formats if you have the codecs installed like DivX,
XviD, AVI, MOV, MPEG1/2,
RM. Built-in MPEG2/SVCD/DVD codec.
SVCD/CVD switchable subtitle support.
QuickTime
Alternative - QuickTime
Alternative will allow you to play QuickTime files (.mov,
.qt, .3gp and other extensions) without having to install the official QuickTime
Player. It also supports QuickTime content that is embedded in webpages.
MPlayer - MPlayer
is a movie player for Linux (and runs on many other Unix systems, and non-x86 CPUs, like Windows,
Mac...). It plays most DVD, VCD, MPEG, VOB,
AVI, OGG/OGM, VIVO,
ASF/WMA/WMV, QT/MOV/MP4,
FLI, RM, NuppelVideo, YUV4MPEG, FILM, RoQ, PVA files. Mencoder is a converter that supports many input video formats.
Can I listen through my
stereo system?
You can listen to internet radio through other systems
than your computer speakers. For instance, if you have a laptop, there is generally a audio jack designated for headphones.
Your stereo system generally has a line-in input, often labelled auxiliary input,
which allows sound sources to be plugged in from the outside, like tape decks, portable CD players, MP3 players, etc.
And there is generally a switch which toggles between auxiliary input, and input from your radio, CD player, DVD player,
etc, which must be set. If you simply plug a stereo line from the headphone jack on your computer to your line-in input on
your stereo system, you can listen in hi-fidelity. If you have Bluetooth Wireless, simply plug in the inputs
as you would on any other item you are using Bluetooth for.
What
is a codec, and where can I get it?
A codec is a downloadable
software encoder or decoder for a particular media format that is geared towards a specific computer platform. Codecs
function much like plugins for browsers, and are used by players or authoring software to work
with the specific media type.
Most
codecs that you will come across are decoders that are geared to presenting media content to
players. Most media players have a list of websites that supply codecs and will go in search
of them when a file is played that requires a particular codec; otherwise use a search engine
to look for it. Free-Codecs.com also lists free versions of codecs
and is generally up to date.
What
are these mms:// and rtsp:// urls?
These signal to the browser and player that a certain media protocol
is being used. RTSP is used for Real Networks, Apple, and Windows formats; MMS
is used only for the Windows media format
Want more Training and Videos on this subject?
We have a current database of over 127,470 Mobile Cloud Training Modules....all related to Mobile Cloud Computing Concepts....with
FREE Videos...and growing daily. Take 1 or 2 seconds to fill out form below.....then we'll immediately respond...thanks Clear-Cloud
Training VP Trent Daley
