On Sat, 23 Apr 2005, sean wrote:
> This used to work all the time:
No, it never worked. 'mpeg2enc' has never ever been able to encode
4:1:1 input to MPEG-2.
> smil2yuv -i 2 dv/test.dv |
Note the "-i 2" - that's the clue to smil2yuv to emit 4:1:1 data
rather than converting to 4:2:0 (which is the only format the mpeg2enc
has ever accepted).
> mpeg2enc -f 8 -v 2 -F 4 -n n -a 2 -I 1 -o test -K kvcd -q 5
> -b 8500 -4 1 -2 1
mpeg2enc understands only 420mpeg2. Now by luck 4:1:1 and 4:2:0
frames are the same size but the output of the encoder will merit
entry in a 'special effects contest' ;)
> mjpegtools - cvs
> smilutils-0.3.0
I think there's a slightly newer smilutils in cvs but the changes
are minor (couple fixes for 64bit operation, etc).
> Any help appreciated.
Either 1) leave out the "-i 2" with smil2yuv and it will output a
420mpeg2 stream or 2) add, just before the encoder, a y4mscaler
to resample the stream ('y4mscaler -O chromass=420mpeg2').
The 2nd choice is what I use since y4mscaler performs a higher quality
resampling. The other benefit is that any intermediate filters work
with the acquisition format (4:1:1) rather than a modified version of
the data. That's possible because most of the filters work with
any of the 3 plane formats.
Try feeding 4:2:0 into the encoder and seeing if that works better.
If not then there's a bug(let) in smilutils (which I've seen on
occasion but not enough to reproduce at will) that might be worked
around by creating a dummy .smil file referencing the entire DV clip.
Cheers,
Steven Schultz
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