hi,
i tried to figure out, if ppmtoy4m have the option 420mpeg2, but this
fails with newer mjpegtools version.
with mjpegtools-1.8.0:
# ppmtoy4m -h|grep 420mpeg2|wc -l
the result is 1, thats ok, but with mjpegtools-1.9.0rc2 and
mjpegtools-1.9.0rc3
it's no longer possible to get an integer result.
# ppmtoy4m -h|grep 420mpeg2|wc -l
usage: ppmtoy4m [options] [ppm-file]
Reads RAW PPM image(s), and produces YUV4MPEG2 stream on stdout.
Converts computer graphics R'G'B' colorspace to digital video Y'CbCr,
and performs chroma subsampling.
If 'ppm-file' is not specified, reads from stdin.
options: (defaults specified in [])
-o n frame offset (skip n input frames) [0]
-n n frame count (output n frames; 0 == all of them) [0]
-F n:d framerate [30000:1001 = NTSC]
-A w:h pixel aspect ratio [1:1]
-I x interlacing [p]
p = none/progressive
t = top-field-first
b = bottom-field-first
-L treat PPM images as 2-field interleaved
-r repeat last input frame
-S mode chroma subsampling mode [444]
'420jpeg' -> 4:2:0 JPEG/MPEG-1 (interstitial)
'420mpeg2' -> 4:2:0 MPEG-2 (horiz. cositing)
'444' -> 4:4:4 (no subsampling)
-v n verbosity (0,1,2) [1]
-B PPM image is packed with BGR pixels [RGB]
0
thanks Martin
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