Definitions and Statements

Audio decompressor

Software component which decompresses audio. It must be designed to work with ACM or DirectShow. Note that different compression methods require different decompressors. There is no universal decompressor capable of decoding all compressed streams.

Audio renderer

The audio device that will play the sound. This is usually your sound card. Some computers have more than one sound playback device. You choose which sound playback device will play the sound by selecting the corresponding audio renderer.

Audio stream

The portion of the file holding the audio data. The audio data might be compressed to save disk space. The data has to be decompressed using an audio decompressor before you can play (hear) it.

BSTR

When "getting" a BSTR property, the memory containing the string is allocated with SysAllocString. When this string is no longer needed, free this memory by calling SysFreeString if you are working in an environment such as C or C++ that does not automatically delete the memory. VB automatically deletes the memory, so VB programmers do not need to free the memory themselves.

Codec

A COmpressor combined with a DECompressor, or encoder and a decoder, which allows you to both compress and decompress that same data.

Compressor

Also known as an encoder , this is a module or algorithm to compress data. Playing that data back requires a decompressor, or decoder .

Decoder

Also known as a decompressor, this is a module or algorithm to decompress data.

Encoder

Also known as compressor, this is a module or algorithm to compress data. Playing that data back requires a decompressor, or decoder .

FLV

Flash format.

JPEG

Joint Photographic Experts Group - commonly used method of compression for photographic images.

LEAD VP8

LEAD VP8 is a DirectShow filter for compressing/decompressing video data using the VP8 standard. VP8 is suitable for a wide range of bandwidths, from low bandwidth to broadband.

Multiplexer

A module that combines audio and video into one file.

Target format

The format to be used for the converted file. This includes the file format, any special settings used by that format, and which audio and/or video codec is to be used for the conversion, and any special settings used by the codecs.

TIFF

Tagged Image File Format (abbreviated TIFF) is a file format for storing images. TIFF is a popular format for high color depth images, along with JPEG.

Title

The name for a group of related video files (called "Chapters") on your DVD. For example, for a DVD called "My Summer Vacation," you might have the titles "Water Skiing," "New Friends," and "Hiking." For each of those titles, you might have one or more different video files.

Transcode Topology

A collection of media sources, sinks, and transforms that are connected in a certain order that is used to convert data from one format to another.

Video decompressor

Software component that decompresses video. It must be designed to work with VFW or DirectShow . Note that different compression methods require different decompressors. There is no universal decompressor capable of decoding all compressed streams.

Video renderer

The MediaFoundation component responsible for playing the video. Some renderers might have useful settings you can adjust if you have problems playing the video.

Video stream

The portion of the file holding the video data. The video data might be compressed to save disk space. The data has to be decompressed using a video decompressor before you can play (see) it.

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