Hi!
> From: Matto Marjanovic <[EMAIL PROTECTED]>
>
> The delay was because I was planning to put up a good clear demonstration of
> the benefits of using smil2yuv and y4mscaler in "4:1:1" mode to handle NTSC
> DV video...
>
> Anyhow, it certainly doesn't make anything *worse*. If anyone (Steve?) wants
> to try some independent tests, comparing MPEG-2 bitrates between "-i0" and
> "-i2" in smil2yuv at the head of the chain, I'd be happy to see what happens.
Someone mention my name? :)
y4mscaler-0.4.1 and the latest smilutils were installed earlier this
evening. had a ~3 minute movie trailer's DV data (capture via a
Canopus ADVC100 of course ;)) handy to use a a test case.
The only thing changed in the script was adding "-i 2" to the
smil2yuv command, all other options to the filters and encoders
were left unchanged.
I was not doing any scaling (the frames were the right size from
earlier stages in the pipeline) but only the 4:1:1 to mpeg_4:2:0
conversion with:
y4mscaler -O size=704x480 -O sar=src -O chromass=420_MPEG2
First the summary from the old (without "-i 2" used with smil2yuv):
INFO: [mplex] No. Pictures : 5672
INFO: [mplex] No. Groups : 390
INFO: [mplex] No. I Frames : 390 avg. size 29313 bytes
INFO: [mplex] No. P Frames : 1520 avg. size 24700 bytes
INFO: [mplex] No. B Frames : 3763 avg. size 19660 bytes
INFO: [mplex] Average bit-rate : 5028400 bits/sec
INFO: [mplex] Peak bit-rate : 7359600 bits/sec
And now with "smil2yuv -i 2" and having y4mscaler do the conversion:
INFO: [mplex] No. Pictures : 5672
INFO: [mplex] No. Groups : 392
INFO: [mplex] No. I Frames : 392 avg. size 29102 bytes
INFO: [mplex] No. P Frames : 1521 avg. size 22934 bytes
INFO: [mplex] No. B Frames : 3760 avg. size 18612 bytes
INFO: [mplex] Average bit-rate : 4755200 bits/sec
INFO: [mplex] Peak bit-rate : 7299200 bits/sec
Wow. Going from 5028400 to 4755200 is a significant difference - that's
about 5% if my arithmetic skills haven't completely eroded. The
picture quality is good (I've only watched it on a monitor so far
rather than a real TV).
Guess I'll have to redo the entire 99 minute movie now ;)
Cheers,
Steven Schultz
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