yuv2lav(1)
NAME
yuv2lav - encodes lavtool's raw YUV frame streams into
MJPEG files
SYNOPSIS
yuv2lav [-f a|A|q|m] [-q num] [-b num] [-I num] [-m num] [-v num] -o output-file
DESCRIPTION
yuv2lav is a simple MJPEG encoder for raw YUV frame
streams as they are emitted by lav2yuv(1) or lavpipe(1),
for example. It reads its input from stdin and is capable
of writing AVI, Quicktime and Gernot Ziegler's movtar for
mat, at the time being.
OPTIONS
The command line options allow to specify the output file
name, JPEG encoding quality and the amount of memory that
will be allocated for JPEG compressed data.
- -o output-file
- This (compulsorary) option sets the name of the
file that yuv2lav will write its output to. If the
output file contains a % (e.g. file%02d.avi), the
output will be written to multiple files in case
this is necessary (file00.avi, file01.avi and so
on). - -f a|A|q|m
- This sets the output file format, which has to be
one ofa - for AVI file output,
A - for AVI with reversed fields,
q - for Quicktime output or
m - for movtar output. - AVI with reversed field of course only makes sense
if yuv2lav's feed is an interlaced video source and
should only be needed if you experience frame
reversal problems in your output. - -q num This option specifies the JPEG encoding quality as
- passed through to libjpeg. The default value is 80,
num must lie within 24...100 inclusive (think of it
as percentage values, although with a lossy com
pression algorithm like JPEG, keeping 100% of the
original quality is of course not really possible). - -b num This option specifies the size of the buffer (in
- kBytes) that yuv2lav allocates in order to store
the compressed JPEG data in it. The default value
(256k) is perfectly enough for 100% quality full
sized PAL/NTSC, but if you want to compress SuperMega-HDTV or if you are low on memory, you can use
this option to suit your needs. - -m num This is the maximum size (in MB) per file. Nor
- mally, this depends on the output file type.
- -I num Force a specific interlacing type. 0 means no
- interlacing, 1 means top-field-first, 2 means bot
tom-field-first. - -v num Verbosity level. 0 means only print error messages,
- 2 prints full debug output.
- -? Display a synopsis of the command syntax.
EXAMPLES
- lav2yuv movie.avi | yuv2lav -fq -q 30 lowbitrate.mov
- would recompress movie.avi as a low bit rate Quick
time file. - lavpipe input.pli | yuv2lav -q80 output.avi
- would save the movie assembled by lavpipe as a sin
gle AVI file.
BUGS
If you experience any problems with this tool, please feel
free to contact the developers (see below).
AUTHOR
- This man page was written by pHilipp Zabel.
If you have questions, remarks, problems or you just want
to contact the developers, the main mailing list for the
MJPEG-tools is: - mjpeg-users@lists.sourceforge.net
- For more info, see our website at
- http://mjpeg.sourceforge.net/