Re: MPEG1 encoding artifacts

>>The latest mpeg2enc seems to generate a lot of artifacts when I try to
>>use it to make VideoCD-grade video.
>>
>>I have a 160k clip.yuv.bz2 file that can be used to reproduce the
>>problem, plus the shell script that produced the clip.
>
>What encoding do you use ?  I use that command: lav2yuv $i | mpeg2enc
>-f 1 -4 1 -2 1 -N 1.5 -M 2 -o video.m1v
>
>I still encode to VCD, but don't use it afterwards.  I have checked
>several videos but never seen such extreme artifacts.

Yeah, I kind of lucked into such an extreme example -- anyone that knows the mpeg2enc code should have no trouble tracking it down!

Enclosed is the shell-script I used to generate the artifacting VideoCD.  It's a cut-down version of a shell-script that I've used to generate dozens of videos.  I'll attach the 160k clip.yuv.bz2 file on request.

-Steve

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#!/bin/bash

rm -f fifo.yuv fifo2.yuv
mkfifo fifo.yuv fifo2.yuv

smil2yuv -i 2 clip.kino \
	| yuvcorrect -v 0 -Y CONFORM \
		-T TOP_FORWARD -T INTERLACED_TOP_FIRST \
	| yuvkineco -F 1 -n 20 \
	| y4mscaler -v0 -I matte=720x472+0+0 -O sar=src -O size=720x480 \
		-O chromass=420_mpeg2 -S option=sinc:5 \
	| y4mdenoise -p 3 -z 0 -t 4 -T 3 -m 30 -M 3 \
	| y4mscaler -v 0 -O sar=src -O chromass=420_jpeg -S option=sinc:5 \
	| yuvmedianfilter -f -r 1 -R 1 -w 2.667 \
	| y4mscaler -v 0 -O preset=vcd -S option=sinc:5 \
	| y4mdenoise -p 3 -z 0 -t 2 -m 30 -M 3 \
	| yuvmedianfilter -f -r 1 -R 1 -w 8 \
	| tee fifo.yuv \
	| tee clip.yuv \
	| mpeg2enc -v 0 -I 0 -n n -f 1 -S 9999 -K kvcd -4 1 -2 1 -s -r 16 -a 2 \
		-F 1 -o clip.m1v &
sleep 5

bzip2 -9 < fifo.yuv > clip.yuv.bz2 &

sleep 5
rm -f fifo.yuv fifo2.yuv
wait