Convert Video from FLV(Flash Video) to AAC(iTunes Audio) with FLV to Video Converter

admin    Adobe Flash Player     AACiTunes, Audio, Convert, Converter, FlvFlash, from, Video

FLV to AAC
This tutorial is to show you how to convert music videos downloaded from YouTube and Google Video, etc. to AAC for digital audio. First of all, we have to make it clear that the YouTube videos and Google videos communicating online are of the Flash Video file, or FLV file format. What is FLV?
FLV, or Flash Live Video file, is a preferred file format that is designed for web playback, offering high rates of compression to deliver video over the Internet using Adobe Flash Player.
FLV content cannot be played back directly but must be embedded in (or linked from) an SWF file. You create (or download) a “container” SWF file from which to play the FLV file. The most common approach is to use an SWF file that functions as a media player with screen and playback controls. Notable users of the FLV format include YouTube, Google Video, Reuters.com, Yahoo! Video and MySpace.

What is AAC?

Advanced Audio Coding (AAC) is a standardized, lossy compression and encoding scheme for digital audio. AAC is promoted as the successor to the MP3 format by MP3’s creator, Fraunhofer IIS.

Depending on the encoder used, AAC generally achieves better sound quality than MP3 at the same bit rate, particularly below 192 kbit.

AAC’s most famous usage is as the default audio format of Apple’s iPhone, iPod iTunes, and the format used for all iTunes Store audio (with extensions for proprietary Digital Rights Management (DRM) where used).

AAC is also the standard audio format for Sony’s PlayStation 3 and the video standard. HE-AAC is part of digital radio standards like DAB+ and Digital Radio Mondiale.

Install and launch Moyea FLV to Video Converter Pro 2

Add FileClick on the “Add FLV” button on the tool bar to import your target FLV files into the program. You can preview the files before importing. Change the Output SettingsYou can select the output path by clicking the folder icon right behind “Export to…“.Select Audio/ Audio AAC in the drop-down list of “Export format“. Click “Settings” and you could start to adjust the settings of the FLV for your output to play on portable devices. You can change the bit rate, audio codec, and sample rate of the Audio, Start ConversionClick “Convert” and “Start” to start to convert the files on the file list to the output folder.

FLV to WMA: Convert Video from FLV(Flash Video) to WMA( Windows Media Audio)

admin    Adobe Flash Player     Audio, Convert, FlvFlash, from, Media, Video, Windows

FLV to WMA (Windows Media Audio)

This tutorial is to show you a step-by-step demonstration of converting videos downloaded from YouTube and Google Video, etc, to WMA for playing on Windows Media Player or MP3. First of all, we have to make it clear that the YouTube videos and Google videos communicating online are of the Flash Video file, or FLV file format.

What is FLV?
FLV, or Flash Live Video file, is a preferred file format that is designed for web playback, offering high rates of compression to deliver video over the Internet using Adobe Flash Player.
FLV content cannot be played back directly but must be embedded in (or linked from) an SWF file. You create (or download) a “container” SWF file from which to play the FLV file. The most common approach is to use an SWF file that functions as a media player with screen and playback controls. Notable users of the FLV format include YouTube, Google Video, Reuters.com, Yahoo! Video and MySpace.
What is WMA?

Short for Windows Media Audio, a Microsoft file format for encoding digital audio files similar to MP3 though can compress files at a higher rate than MP3. WMA files, which use the “.wma” file extension, can be of any size compressed to match many different connection speeds, or bandwidths.

Additional information is available on Microsoft Windows Media page.

Install and launch Moyea FLV to Video Converter Pro 2

Add File
Click on the “Add FLV” button on the tool bar to import your target FLV files into the program. You can either input FLV from your folder or from IE cache by clicking the drop-down list behind “Add FLV” button. Before you import the FLV, you can click to preview them.

With this program, you can also add watermarks to the video.

Change the Output Settings

Before you start the settings to the audio, you must select the output format in the “Export format” box. As shown in the picture below, select Audio and then Audio WMA.

Click “Settings” and you could start to adjust the audio, changing the audio codec, bit rate, sample rate, and channels.

Convert
After all the settings, you can click “Convert” and “Start” to convert the files on the file list to the output folder. And then, you can enjoy the WMA with Windows media player or MP3.

Compression of Video and Audio Signals

admin    Flash Video     Audio, Compression, Signals, Video

Video compression

At present there are used a few compression methods. The oldest of them (JPEG, H-261, MPEG-2) use groups of pixels (covering some area, for example 8 bits x 8 bits). These methods don’t analyze the actual structure of the image. This generation of compressors may be used in the case of lower resolutions when transmission speed isn’t less than 64kbps.

More effective compression is offered by second generation of algorithms. These algorithms (e.g. MPEG-4) carry out a kind of scene analysis before realization of adequate compression procedure. They make out that image can be divided into fragments in more effective way. Image which consists of pixels with the same features can be divided into specific groups, and this operation significantly improves compression process. To achieve such analysis procedure, a model of human perceiving has been employed (HVS – Human Vision System) .

Typical second generation encoder consists of following modules: segmentation, motion estimation, outline and texture coding. The system offers compromise between compression rate and the quality of the image after decompression.

Video compression standards: H-261, H263

The H-261 system has been created for ISDN networks with 64 kbps bandwidth. The H-261 standard allows compression rates from 100:1 to 2000:1, however the higher compression ratio, the lower quality of decompressed image. The codec works in two modes: intra frame – INTRA and inter frame – INTER.

During the INTRA compression mode, the frame is being divided into blocks sized by 8×8 pixels. Then they are compressed using Discrete Cosines Transform (similar to JPEG).

In INTER mode, only changes which have been occurred between following frames are being saved. However, it has to be marked that at least once every 123 frames the compression in INTRA mode has to be carried out.

Development of H.263 standard has been meant to secure video signal compression for low bandwidth networks, about 28.8 to 33.6 kbps.

H-263 is a modernized version of the H-261 standard. In comparison with the original version, half-pixel motion compensation has been employed instead of pixel motion compensation. The header has been reduced, detection and transmission of error correction have been abandoned, and new optional modes of operation have been integrated.

MPEG-4 compression

MPEG-4 is the newest video compression standard which quickly becomes popular, also in the case of video streaming. In comparison with previously presented standards, it integrates effective methods for multimedia data.

New attitude consists in interrelation of data contents with the role for human perception, and extraction of so called audio-visual objects (AVO). There have been integrated solutions allowing scalability of data representation in many dimensions, that is space, time, quality and computational complexity.

The standard has been adjusted to many types of telecommunication networks and can operate at rates from 64 to 1024 kbps.

The concept of MPEG-4 allows transmission of single or several audiovisual AV objects from the sender to the receiver, however before the transmission begins, the initial exchange of information between the encoder and decoder has to be carried out. This way, the convenient algorithm classes and the tools essential for effective use of the link can be settled. Obviously, the coder protects audiovisual objects against errors.

Audio compression

Data stream from audio compression is significantly smaller than video data stream. However, the compression is normally performed to minimize the total bandwidth.

Simple reduction of link’s bandwidth can be achieved by reduction of bit rate (sampling frequency) and reduction of amplitude resolution.

Depending on transmission type, various samplings are used:

Sampling frequency – Application

8.00 kHz – Telephony

16 kHz – Multimedia communication

22.05 kHz – Personal computers

32.00 kHz – Digital radio and television

44.10 kHz – CD – Audio

48.00 kHz – DAT cassette recorders, HDTV

96.00 kHz – DVD

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