png2yuv
Convert PNG images to the YUV4MPEG stream format.
see also :
mpeg2enc - ppmtoy4m - yuv2lav - yuvdenoise - yuvmedianfilter - yuvscaler
Synopsis
png2yuv
[-b num] [-f num]
[-I num] [-L num]
[-n num] [-l num]
[-j filename]
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description
png2yuv
decompresses a sequence of PNG files and pipes the image
data to stdout as a YUV4MPEG2 stream. Any 8bit/pixel PNG
format supported by libpng can be read. stdout will be
filled with the YUV4MPEG movie data stream, so be prepared
to pipe it on to mpeg2enc or to write it into a file.
This tool is
incomplete. The alternative utility you are probably
looking for is ppmtoy4m(1), which is also included in
MJPEGtools.
options
png2yuv
accepts the following options:
-b num
Frame offset: skip output of
the first ’num’ frames. (default: 0)
-f num
Set the frame rate of stream
accepts the same numbers. Not default, this option has to be
specified.
-I num
interlacing mode: p = none /
progressive
t = top field first
b = bottom field first
No default, this option has to be specified.
-L num
0 = non-interleaved (two
successive fields per PNG file)
1 = interleaved fields
-l num
Specifies the number of loops
(default: 0 loops )
-S
samp_mode
chroma subsampling mode, only
for professionals, for more info see ppmtoy4m and the YUV
guide on http://www.mir.com/DMG/.
default: 420_jpeg
When this option is not used the given range of images is
only processed once. If you use this option and as number 1,
jpeg2yv will loop forever writing the image to stdout. When
you use n > 1 it will loop. n-time till it finishes.
-n num
Specifies the nummber of frames
to process. (default: all = -1)
-j
{1}%{2}d{3}
Read PNG frames with the name
components as follows:
{1} PNG filename prefix (e g: picture_ )
{2} Counting placeholder (like in C, printf, eg 06 ))
{3} File extension. Something like this: .png A correct
description of the files could look like this:
picture_%06d.png
-v num
Verbosity level (0, 1 or 2)
bugs
The frame rate
description does not seem to be up to date. The NTSC integer
ratios are not supported (use floating point instead). As
workaround specify a PAL (25) or native FILM (24) and set
the right frame rate in mpeg2enc with the -F option.
Interlaced handling is not implemented yet.
see also
mjpegtools,
mpeg2enc , ppmtoy4m , yuv2lav ,
yuvdenoise , yuvmedianfilter ,
yuvscaler
author
This man page
was written by Gernot Ziegler.
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[:at:]lists.sourceforge[:dot:]net
For more info, see our website at
http://mjpeg.sourceforge.net