Quantcast FFmpeg: Tests Done on Sws Setting - digitalFAQ.com Forums [Archives]
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05-02-2004, 11:00 AM
Fluffbutt Fluffbutt is offline
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A bit limited in test scope (single movie, only a few frames looked at),
and very subjective (my opinions may vary from yours as to what's good or not) BUT..

I've spent most of today doing tests on -sws,
to see what's good, and what's slow.

First my ini:

of=rawvideo=1
ovc=lavc=1
nosound=1
sws=6
lavcopts=vcodec=mpeg1video:vhq=1:vmax_b_frames=2:
vrc_minrate=300:vrc_maxrate=1850:vratetol=1000:vrc _buf_size=327:
vqmin=2:vqmax=24:lmin=1.5:vb_qfactor=1.2:vi_qfacto r=0.8:vqblur=0.3:
keyint=15:aspect=4/3:naq=1:intra_matrix=8,9,12,22,26,27,29,34,9,10,14 ,26,27,29,34,37,12,14,18,27,29,34,37,38,22,26,27,3 1,36,37,38,40,26,27,29,36,39,38,40,48,27,29,34,37, 38,40,48,58,29,34,37,38,40,48,58,69,34,37,38,40,48 ,58,69,79:
inter_matrix=16,18,20,22,24,26,28,30,18,20,22,24,2 6,28,30,32,20,22,24,26,28,30,32,34,22,24,26,30,32, 32,34,36,24,26,28,32,34,34,36,38,26,28,30,32,34,36 ,38,40,28,30,32,34,36,38,42,42,30,32,34,36,38,40,4 2,44

vf=scale=352:288
ofps=25

It's (k)vcd, and it runs at 20 fps roughly.
Produces files 10 megs (I'm after 13 megs).

The Results:

0 fast bilinear (default) - average quality

1 bilinear - very nice, fast, almost as good as 2

2 bicubic (good quality) - nicer than experimental, seems a little bit sharp tho

3 experimental - seems extremely good, strange colour blotches tho (only noticeable in 300x zoom)

4 nearest neighbour (bad quality) - yes bad

5 area - a bit fuzzy

6 luma bicubic / chroma bilinear - beautiful but causes some colour bleed (eg face into shirt) (only noticeable in 300x zoom)

7 gauss - very nice also removes single dots, maybe too blurred?

8 sincR - slow (half 1-5) harsh buggers colour up (greenish tone)

9 lanczos - nices sharp without extra artifact blocks

10 bicubic spline - increases macroblocking, not as good as lanc or bicubic

Results: use in this order 9, 2, 6, 10, 7

6 is actually very nice, and 3 (experimental) is brilliant on some movies..

<an aside> what can I change in the ini to improve the picture (and increase file size up to the 13 mb??
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