[MPlayer-cygwin] -=[ Few Questions ]=-

Thu Jan 20 01:58:29 CET 2005

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Hello, Joey!                       Thursday, January 20, 2005.   01:29:58

On day Wednesday, January 19, 2005 you wrote:

> How about:
>   -vf scale=400:200,expand=400:300
> Or:
>   -vf dsize=2/1,expand=400:300

Well, this works but not with every file or aspect ratio. And also
black stripes (subtitles) don't always go to the very bottom edge of
the screen.

I know how to manage when I'm expanding video without changing
original aspect. But I need help when changing both aspect & using
expand.

e.g.

1) Monitor aspect is 4:3=1.333333333 and so on
2) Movie resolution for example: 720:288
3) 720/1.3333333=540
4) -vf expand=720:540

This way I'm getting perfect (non scaled) movie, with subtitles positioned as
much low as possible. There is another way too:

1) vop=expand=640:480,scale=640:-3

Anyway, the problem is when I want to use some other aspect ratios while still
using expand. I can't seem to find an algorithm to calculate this by frontend.
What I'm using for this (aspect 16:9 e.g.) is next:

1) -aspect 16:9 -vf expand=720:x,scale=720:y
2) x=? PROBLEM
3) y=720/(16/9)=720/1.78=404
4) So I guess x value to get at the end prescaling to value to be exactly
   720/1.333333=540
5) while testing a bit I come to the value for x=385. This way I get perfect
   movie scaled to 16:9 & expanded to proportions of monitor. Subtitles are
   positioned as much low as it is posible.

MPlayer output is next:

> MPlayer 1.0pre5-3.2.3 (C) 2000-2004 MPlayer Team
>
> ........cut
>
> ==========================================================================
> Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
> MP3lib: init layer2&3 finished, tables done
> AUDIO: 48000 Hz, 2 ch, 16 bit (0x10), ratio: 14000->192000 (112.0 kbit)
> Selected audio codec: [mp3] afm:mp3lib (mp3lib MPEG layer-2, layer-3)
> ==========================================================================
> Opening video filter: [scale w=720 h=404]
> Opening video filter: [expand w=720 h=385]
> Expand: 720 x 385, -1 ; -1  (-1=autodetect) osd: 0
> ==========================================================================
> Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
> Selected video codec: [ffdivx] vfm:ffmpeg (FFmpeg DivX ;-) (MS MPEG-4 v3))
> ==========================================================================
> Checking audio filter chain for 48000Hz/2ch/16bit -> 48000Hz/2ch/16bit...
> AF_pre: af format: 2 bps, 2 ch, 48000 hz, little endian signed int
> AF_pre: 48000Hz 2ch Signed 16-bit (Little-Endian)
> AO: [win32] 48000Hz 2ch Signed 16-bit (Little-Endian) (2 bps)
> Building audio filter chain for 48000Hz/2ch/16bit -> 48000Hz/2ch/16bit...
> Starting playback...
> VDec: vo config request - 720 x 288 (preferred csp: Planar YV12)
> Opening video filter: [pp]
> VDec: using Planar YV12 as output csp (no 0)
> Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
> SwScaler: reducing / aligning filtersize 1 -> 4
> SwScaler: reducing / aligning filtersize 1 -> 4
> SwScaler: reducing / aligning filtersize 21 -> 10
> SwScaler: reducing / aligning filtersize 21 -> 10
>
> SwScaler: Bicubic spline scaler, from Planar YV12 to Planar YV12 using MMX2
> VO: [directx] 720x404 => 720x540 Planar YV12
> A:   0.7 V:   0.7 A-V:  0.004 ct:  0.020   19/ 19   8% 19%  0.1% 0 0 0%
> Exiting... (Quit)
>
> c:\Program Files\MPlayer>

The line I talk about is:

> VO: [directx] 720x404 => 720x540 Planar YV12

Do you have any idea how to calculate this in a way of algorithm. The
problem is I don't know how MPLayer does the scaling. If I new that I
could easilly calculate what I need, but I don't know. I can't seem to
find a pattern. Maybe my eyes or brain needs upgrade or something...?

>> 2) Is there a way to play Audio CDs under Win & how?

> Yes, it's called "use other applications."  Please feel free to port
> cdparanoia to cygwin, though.  Nobody has done this yet, but that's what
> MPlayer uses for cd audio.

Yeah, I thought so. It's nothing crucial, but I wanted to know why it
didn't work. Thanks for the idea. Maybe I do so, after finishing this
one. Still, it's much more important e.g. DVD playback than Audio CD.
It was just a thought. (:

> And if you're already tackling this, go ahead and write a VCD module for
> win32, as well.  These two tasks should be in the same general vein (CD
> access using w32api) and nobody's done either one.

I didn't even know that this doesn't work. You intrigued me with this
one, you know (: Now I don't have much spare time, but later...

BTW Thank you for replying!

- --
Kind Regards,
          Milan
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