Mimicking Motion Adaptiveness Blur with Mencoder. - Page 5

maurus · #81 06-10-2004, 09:15 AM

No for the moment....

I use Mplex or bbMpeg for muxing.

-Maurus

Koekies · #82 06-10-2004, 09:39 AM

The weird thing is that I'm not getting underflows while muxing with mplex

maurus · #83 06-10-2004, 10:16 AM

With Mplex the error is under-runs, not owerflows (that is in MEncoder).

I get a lot of overflows in MEncoder and not usually over-runs in MPlex.

-Maurus

kwag · #84 06-10-2004, 10:50 AM

Quote:

Originally Posted by Koekies

Is anyone getting buffer underflows in mencoder with these filters?

What resolution are you encoding to, and what is your VBV size and MAX bitrate

kwag · #85 06-10-2004, 10:53 AM

Quote:

Originally Posted by SILK

The quality is very good but I can't wait so long.

That's the price we have to pay for motion/object adaptive encoding

-kwag

maurus · #86 06-10-2004, 11:23 AM

I get a lot of overflows with this settings:

Code:

480x576, vrc_maxrate=2500:keyint=15:vrc_buf_size=917

and I use the next filter chain:

Code:

yuvcsp,scale=480:432::0:9,crop=448:432:16:0,hqdn3d,sab=.5:.5:1,noise=2th,expand=480:576:16:72

The crop, scale and expand parameters ffrom Incredible's MEncalc.

-Maurus

SILK · #87 06-10-2004, 11:31 AM

Quote:

That's the price we have to pay for motion/object adaptive encoding

AS i'm planing for 2 movies on 1 DVD at 704x576 can i adjust the parameters a little to get an improve in speed?

kwag · #88 06-10-2004, 11:49 AM

Quote:

Originally Posted by SILK

AS i'm planing for 2 movies on 1 DVD at 704x576 can i adjust the parameters a little to get an improve in speed?

Sure

Drop "sab" from the filter chain.
2 movies (~4 hours without adaptive filtering) on one DVD is just fine with the "notch" matrix

-kwag

digitall.doc · #89 06-10-2004, 11:53 AM

Thanx a lot for your clear answer Kwag. Just a few questions:

Quote:

Originally Posted by kwag

Quote:

- you dropped vqblur=0 (so you're using default 0.5). With vqblur=0 mencoder is supposed to raise quantizer immediately whenever it's needed; with vqblur=0.5 quantizers are averaged with previous values. Why do you want mencoder to do so?, in what way does it improve the stream?.

To avoid the spikes that many people were seeing.

So the effect you found when dropping vqblur was no bitrate spikes, isn't it?. In your tests, did you compare just with and without vqblur, or did you change something else that could make this same effect?. I don't question your results, in fact I don't remember having tested this. But fron a theoretic point of view, when it comes an scene where a raise of bitrate is needed, vqblur=0 allows quantizers raise fast (and moderate bitrate), and default 0.5 will make quantizers average previous, and then more bitrate needed... just if I understood well the theory.
I read somewhere that vratetol lower values would make bitrate more "stable" (even vratetol=0 would be like constant bitrate), I still have to test some values.

Quote:

Originally Posted by Kwag

Quote:

- finally, you're using a lmin=0.01 value. I tested really low values earlier (0.1), not so low, and with them I got a planar Q curve, as when using vqscale. And it also made bitrate peaks raise a lot. What's your purpose when using this very low value?,

With the value I have set lmin and scplx_min, I'm getting better bitrate distribution.

Quote:

don't you get a planar Q curve, and high bitrate peaks?.

Nope. No crazy peaks at all, and bitrate within the MAX limits every time

But in your sample I see you get a planar Q curve. OK it's a small sample, but the encoder behaves just as I expected: lmin=0.01 makes quantizers go always as low as possible. I just don't understand why Q=2 and not Q=1, that is the value of vqmin and mbqmin. MAybe an effect of vqblur=0.5.
If I find the time I'll do some tests just tweaking vqblur and vratetol, and see its effects... and post in another thread, since this is all OT. Sorry.
Well, please tell me what do you think about this.
Cheers

SILK · #90 06-10-2004, 11:59 AM

Thanks Kwag

So my parameters should be something like that?

Code:

vf=yuvcsp,scale=688:414:0:0:60,crop=718:576:-1:-1,hqdn3d,noise=3th,expand=704:576:-1:-1:1

kwag · #91 06-10-2004, 12:01 PM

Quote:

Originally Posted by SILK

Thanks Kwag

So my parameters should be something like that?

Code:

vf=yuvcsp,scale=688:414:0:0:60,crop=718:576:-1:-1,hqdn3d,noise=3th,expand=704:576:-1:-1:1

As you're doing KDVD, no need to keep the MIN bitrate at ~300Kbps with noise=3th, so change it to noise=1th.

-kwag

SILK · #92 06-10-2004, 12:05 PM

Ok, thanks again.

And just to be sure, my command line

Code:

2240
of=rawvideo=1
ovc=lavc=1
nosound=1
sws=2
lavcopts=vcodec=mpeg2video:vstrict=-1:vmax_b_frames=2:vrc_maxrate=5000:aspect=1.3333:keyint=15:vrc_buf_size=1835:preme=2:precmp=2:autoaspect=1:vrc_eq=tex:scplx_mask=0.01:vqmin=1:mbqmin=1:lmin=0.01:intra_matrix=8,9,12,22,26,27,29,34,9,10,14,26,27,29,34,37,12,14,18,27,29,34,37,38,22,26,27,31,36,37,38,40,26,27,29,36,39,38,40,48,27,29,34,37,38,40,48,58,29,34,37,38,40,48,58,69,34,37,38,40,48,58,69,79:inter_matrix=16,18,20,22,24,26,28,30,18,20,22,24,26,28,30,32,20,22,24,26,28,30,32,34,22,24,26,30,32,32,34,36,24,26,28,32,34,34,36,38,26,28,30,32,34,36,38,40,28,30,32,34,36,38,42,42,30,32,34,36,38,40,42,44
ofps=%%FPS%%

kwag · #93 06-10-2004, 12:06 PM

That's it

Koekies · #94 06-10-2004, 04:08 PM

My resolution is 704x480 I'm using pullup and softskip to convert from 29,97 to 23,976.
Keaping the fps at 29,97 gives the same error with audio not being sync after a while :P .
I've encoded this DVD about 7 times now

Would lowering the resolution help?
I'm doing skvcd so vbv=917

-Koekies

Edit: and max bitrate is 2200

kwag · #95 06-10-2004, 05:03 PM

Quote:

Originally Posted by Koekies

My resolution is 704x480 I'm using pullup and softskip to convert from 29,97 to 23,976.
Keaping the fps at 29,97 gives the same error with audio not being sync after a while :P .
I've encoded this DVD about 7 times now

Would lowering the resolution help?
I'm doing skvcd so vbv=917

-Koekies

As you're doing 704x480, increase your VBV to vrc_buf_size=1835

-kwag

Koekies · #96 06-10-2004, 05:26 PM

but that's dvd will would your standalone still be able to play it?
Because one of my dvd players isn't even able to play back my skvcds made with mencoder

And they're both philips :P Should I lower ther resolution?
Or would that lower the quality?

-Koekies

kwag · #97 06-10-2004, 05:44 PM

Quote:

Originally Posted by Koekies

but that's dvd will would your standalone still be able to play it?

Why don't you try a small clip

kwag · #98 06-11-2004, 12:51 AM

The more I work with it, the more in love mencoder

Just finished a full encode of "Back to the Future", and I'm

with the quality

Take a look: http://www.kvcd.net/bttf.mpg.cut.45.mpg ( ~10MB MPEG-2 pulled down, 37 seconds @704x480 (2 blocks overscan), clip has audio)

I encoded for KDVD and my complete muxed size is 1,683,362KB

I still have to encode part 2 and part 3, because my goal is to put the trilogy on one DVD-R.
But I'm right on target, and they all should look like that sample

Again, no underrun errors, with the current settings.

Here are some screenshots of the film:

And here's a close up from another scene, for some details:

-kwag

Zyphon · #99 06-11-2004, 02:09 PM

Karl those screenshots look awesome I hope you pull off getting them all to one DVD as I want to do the same with my Trilogy box set.

The mpeg I downloaded look excellent quality wise also.

Nice work Karl.

kwag · #**100** 06-11-2004, 02:15 PM

Thanks Zyphon,

Yes, all three movies should fit "tightly" on one DVD

I haven't had time to encode the other two movies, but I'll probably do that in the weekend.
I'm still fooling aroung with shape adaptive blur settings, so the ones I used are not final.
But so far, I'm very pleased with the results.

-kwag