Video and Audio Properties
Video and Audio Properties
Frame Rate
Frame rate is the number of images that are
displayed per second. In video streams, the playback rate of the video is
described as the frame rate. The higher the frame rate, the smoother is the
motion in the video. Generally, you should reduce the Frame Rate, if you have
chosen a very low Bitrate.
Bit Rate
Bitrate is the amount of information processed per
second. Lowering the bitrate
reduces the quality of the recorded audio and creates smaller files. If you
set a bitrate to 2000 Kbps, a 10 second video file will contain 20,000 kilo bits
of information in the video (including the audio
information). The higher the bitrate, the higher the quality of the video
and the larger the file size. Generally, smaller dimensions
allows you to use a lower bitrate and still have a good quality picture.
Dimensions
The width and the height of a video are together
termed as dimension of a video. For instance, if a video is 320 pixels wide and
240 pixels in height, it is said to have a dimension of 320 x 240 pixels. The
videos that are to be played on the Internet have low dimensions. For desktop
videos, the dimensions are set to a higher values. Note that choosing
Custom dimensions other than the ones in the drop-down list may produce
a file which the device may not be able to play. Reducing the dimensions and
lowering the Bitrate can produce smaller file sizes at the expense of low
quality.
The Aspect Ratio of a video image
is the relationship between the width and the height. Standard TV has an aspect
ratio of 4:3. Movies and HD TV have wider pictures with a different aspect
ratio. Before converting a widescreen movie, make sure that the dimensions you
select are in the correct ratio.
Frequency
Audio Frequency is the number of times the audio
signal can be adjusted per second. Higher frequency values give better
sound quality but also increase the size of the audio. Generally, use
higher frequency for music and lower frequency for speech. Lowering the
frequency reduces the audio fidelity.
Channels
Select Mono to include only one sound
channel with your output file, and Stereo to include channels
for both left and right speakers. Using Stereo produces slightly larger
files.
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