Decimating

[Azure]

I have a movie that is nearly 24 fps and I want to decimate by 1.6 so that I can get as close to 15fps as possible to test gpcinema, is this possible? Would changing the fps to 15 and checking high quality audio correct the a/v desync issue with changing frame rates? Will this a/v sync fix work with changing the fps in virtual dub?

 

[Shane]

sorry it was just released. I will encode some moives and get back to that.

 

[Shane]

alright I had the interleaving at process every 2 frames. then I had audio at 32k/b 11045 or whatever. THe video was high quality but choppy. th esound was in sync tho.

 

[Azure]

alright I had the interleaving at process every 2 frames. then I had audio at 32k/b 11045 or whatever. THe video was high quality but choppy. th esound was in sync tho.

You need to change the clock setting to 133 mhz. When i first ran it, it was choppy, but when I went back to the file select menu and pushed R twice to 133 mhz, my movie file ran flawlessly.

 

[Shane]

really okay ill try it. How good of quality is your picture?

 

[Azure]

really okay ill try it. How good of quality is your picture?

Quality of the picture was very good. the file was about 26 megs. Set it to 133 mhz at your own risk. I think it might mess up the gp32 if you watch a video for awhile at that setting.

 

[Shane]

yeah but 133mhz is the gp32 limit. Anything above that is bad. everything runs at 133mhz or 66mhz or other. Overclocking is 134mhz and up.

 

[Tobriand]

133 is safe. Its the setting used for just about every emu out there, so my GP32 would have popped a while back if it wasn't, I think.

Unfortunately, you can't decimate by non-integer numbers, supposedly because there isn't such a thing as a holf frame. Personally, i think you ought to be able to double or tripple the number of frames (just repeat every one a few times) with a motion blur added after to make every frame slightly different, and then decimate that number, but there's no tool out there to do that at the moment. Wish there was.

 

[Azure]

133 is safe. Its the setting used for just about every emu out there, so my GP32 would have popped a while back if it wasn't, I think.

Unfortunately, you can't decimate by non-integer numbers, supposedly because there isn't such a thing as a holf frame. Personally, i think you ought to be able to double or tripple the number of frames (just repeat every one a few times) with a motion blur added after to make every frame slightly different, and then decimate that number, but there's no tool out there to do that at the moment. Wish there was.

Why do they say that it isn't recommended?

 

[mek]

One can 'decimate' by any number by adding the following to your Avisynth script (assuming you are using Avisynth):

ChangeFPS(clip, fps)

Clip is your clip, duh and fps is your target framerate.

 

[DuderJace]

I've been using vdub 1.5.4 This has the option to convert a framerate, rather than decimate it without a/v sync problems. It let's me make exactly 10fps movies for moviepark, so it'll let you choose exactly 15. Jace

 

[Dozer]

Does that work 4 u? Wen i use that it seems to make it really slow

 

[DuderJace]

It was okay with moviepark. I wouldn't like to say it'll work 100% with gpcinema as I haven't tried it yet, but it should.

 

[Azure]

I've been using vdub 1.5.4 This has the option to convert a framerate, rather than decimate it without a/v sync problems. It let's me make exactly 10fps movies for moviepark, so it'll let you choose exactly 15. Jace

Can version 1.47 do that? 1.5.4 makes the files too big.

 

[Dozer]

I've been using vdub 1.5.4 This has the option to convert a framerate, rather than decimate it without a/v sync problems. It let's me make exactly 10fps movies for moviepark, so it'll let you choose exactly 15. Jace

Can version 1.47 do that? 1.5.4 makes the files too big.

Yes, i think it can, it seems to b the wrong speed wen i do it however, but lots of people get good results doing it this way

 

[Azure]

I've been using vdub 1.5.4 This has the option to convert a framerate, rather than decimate it without a/v sync problems. It let's me make exactly 10fps movies for moviepark, so it'll let you choose exactly 15. Jace

Can version 1.47 do that? 1.5.4 makes the files too big.

Yes, i think it can, it seems to b the wrong speed wen i do it however, but lots of people get good results doing it this way

Virtual Dub 1.4.7 doesn't have the convert to fps feature, so I have to use 1.5.4. Why does 1.5.4 make big files sizes? One family guy episode was 47 megs. I don't think I will have enough room for my sonic movie. How big are the files for you when you use 1.5.4?

 

[Twimfy]

I find that Vdub can be a bit random with it's file sizes regardless of the version (I'm using the one with the option to specify FPS)
Anyhoo I'm very very happy with these settings,

Video:
320*176 (cropped if needed)

Precise bi-linear filtering

Contrast and brightness filter (each slider up by one notch)

Decimate by 2 (will always work fine as long as GP is clocked at 133mhz)

128kbps bitrate

Quantisizers: top value: 12
bottom value:2

max keyframe interval: 300

Max CPU usage: 100% (usually keeps the file size down a bit more)

1 -pass.

Sound

11125khz (or whatever it is) at 32bit

Stereo, with high quality box ticked

Interleaving (make sure the 'enable a/v interleave box is unticked)

Volume (boost it up to 123% it'll make it nice and loud through the Speakers without the crackling)


I find that these settings get me great picture quality, perfect sync and good volume with GP cinema at 133mhz.

And question for Azure, Is that the Sonic Movie on DVD your using or a P2P download? Just I have the VHS and I've been searching everywhere for the DVD.

 

[Azure]

I have the DVD.

 

[Twimfy]

Thanks, but I forgot to mention that I'm looking for region 2, it's like gold dust.