LEAD VP8 Encoder User Interface

The 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. Encoder Also known as compressor, 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. is a DirectShow© filter for compressing video data using the VP8 standard. VP8 is suitable for a wide range of bandwidths from low bandwidth to broadband. In addition to VP8 files, VP8 compressed video data can be stored inside MKV or WEBM container files with the option of saving the file with or without the audio data.

Key Features:

LEAD's VP8 video codec A COmpressor combined with a DECompressor, or encoder and a decoder, which allows you to both compress and decompress that same data. is a multimedia compressor / decompressor that registers into the Windows® collection of multimedia drivers and integrates with any application using DirectShow A multimedia framework and API produced by Microsoft for software developers to perform various operations with media files. Most Windows video-related applications on Windows, such as Microsoft's Windows Media Player, use DirectShow to manage multimedia content.. Existing video software, such as Windows® Media Player® and Ulead Media Studio®, can utilize this codec to play, create and edit industry standard VP8 video streams.

Options for the LEAD VP8 Encoder can be set manually through the encoder property page, which is shown in the figure below:

 

 

Changes will be applied only when the filter's state is stopped (ltmmConvert_State_Stopped), and can be set permanently by selecting Apply or OK. To abandon changes select Cancel. Positioning the mouse pointer over a control displays general information for that control.

If you are using the encoder with a third-party software package, refer to your softwares documentation for information on how to access the encoders property page(s).
 

The following table shows the controls and their descriptions:

Control

Description

Mode drop-down list box

Value that determines the encoding mode.

If CBR mode is selected, the compression level is constant and the storage requirements can be easily predicted. However, the quality of more dynamic scenes or those with more picture detail may be affected. The associated bit rate describes the amount of data used/transferred within a time period. The higher the bit rate, the lower the compression and the better the quality.  If VBR is selected, the compression level is varied to achieve the desired average bitrate and the storage requirements can be easily predicted. The higher the average bit rate, the lower the compression and the better the quality. The bit rate can be adjusted using the Bit rate edit box in Kilobits per second.

 

Possible encoding mode values:

 

Value

Meaning

 

Single pass VBR

Encodes using a single pass, allowing for variable bit rate.

 

Single pass CBR

Encodes using a single pass, keeping the bit rate constant.

 

Double pass VBR - pass 1

Encodes using the two pass method, allowing for variable bit rate. NOTE: The Double pass VBR - pass 2 encoding step below must also be performed before the final VP8 compression is complete.[*]

 

Double pass VBR - pass 2

Encode using the two pass method, allowing for variable bit rate. NOTE: The Double pass VBR - pass 1 encoding step above must first be performed before running the VP8 compressor in this mode.[*]

Bit rate edit box

Value that determines the bit rate for the CBR or VBR encoding modes.

Key frame interval edit box

The frequency of key frame generation. Possible values are: 0 - 100 seconds

Encoding deadline edit box

The deadline for frame encoding in microseconds. A value of 0 will disable deadlining.

[*]  To increase compression performance, VP8 can use a 2-pass encoding method. 2-pass compression is achieved by converting using the VP8 compressor twice on the source video stream.