Raspberry Pi A, User Manual, Page: 292 / 314

P A R T V
A P P E N D I X E S
276
Raspivid Options
Designed to capture moving images,
raspivid
has some specific options that do not apply
to
raspistill
. These options are listed below.
❍
-b or --bitrate (Encoding Bitrate)—
Sets the bitrate of the captured video, in bits per
second (BPS.) The higher the bitrate, the higher the quality of the finished video—but
the larger the file size. Unless you have a specific requirement from your video, this
should typically be left at the default setting.
❍
-e or --penc (Encoding Preview)— Uses the preview window to show video frames after
they have been passed through the encoder, rather than before. Provides an accurate pre-
view of the final video, and most commonly used when tweaking the Encoding Bitrate.
❍
-fps or –-framerate (Video Framerate)— Sets the framerate of the captured video,
in frames per second. Higher figures give smoother motion, while lower figures take up
less disk space. Recording at a rate above 30 frames per second, which can be turned
into slow-motion video with a video editing application, will likely only work at lower
resolutions (set with the
--width
and
--height
options).
❍
-g or --intra (Intra Refresh Period)—
Sets how often a key frame, also known as an
intra-coded picture or I frame, should be captured. A key frame is an entire image,
rather than the changes recorded since the last image. More frequent key frames can
result in higher quality video when recording rapidly changing scenes, but will result in
larger file sizes.
Raspiyuv Options
Raspiyuv
is an application designed to capture one of two specific formats of colour
image—YUV or RGB. Most users will be better off using
raspistill
, which outputs into
image formats ready for use; those who plan to edit their images further after capture, how-
ever, may find
raspiyuv
a useful tool.
Most
raspiyuv
options are the same as found on
raspistill
with the following exception:
❍
-rgb or --rgb (Capture RGB)—
Sets
raspiyuv
to capture red, green, blue (RGB)
pixel data rather than the chrominance and luminance normally used.