Divx tv-out ratio question

[movmasty]

i dont have a tv-out

tellme, if you play a 640x352 divx on the tv what happens?
how is the ratio on tv?
should i have to resize the movie to play on tv throught tv-out??

[hakko504]

That depends on what TV-card you have.
My Matrox Marvel G400 would most likely play it fullscreen on my widescreen TV. It has a tendency to try to fit video to either 4:3 or 16:9. I had a video 448x288 (14:9) that it scaled to fullscreen (16:9). Not quite what I expected.

I try to only use 352x288 (recordings), 384x288 (DVD 4:3), 512x288 (most 16:9) 704x288-400 (DVD rips, 2.35:1-16:9). These sizes have proven to be the ones that works best for me.

[movmasty]

Originally posted by hakko504
That depends on what TV-card you have.
I had a video 448x288 (14:9) that it scaled to fullscreen (16:9). Not quite what I expected.
I try to only use 352x288 (recordings), 384x288 (DVD 4:3), 512x288 (most 16:9) 704x288-400 (DVD rips, 2.35:1-16:9).

scaled it also vertically? to 576?
like does VCD ?
but do you have the option to play the 288 linees like 288?
and if was different from 288(576/2)320 eg?

i asked this question thinking to the way tv works,
tv has vertical numbered linees(480 or 576), so i suppose it could give one pixel to each line.
but horizontally tv works differently, the number of dots isnt fixed,
on average should be 640,but some tv has less(specially small tv),and ,maybe,16:9 screens more,
and doesnt works with numbered linees,but just spreads the signal on its available dots,picking up at intervals.
then i aspect that tv-out plays two vids,say,448x288 and 352x288,BOTH full screen,and either on a 16:9 and a 4:3 tv.
how can your tv-out know how many horizontal dots your tv has?
so even if could put 288pixels on 288 linees(adding black bars)
will always put the width of any vid on all the screen?
id like to know since im getting a tv out.

what is the difference among tv-out and standalone players(DVD and CD)?

[hakko504]

As far as I can tell most TV-out have a resolution of 720(704)x576/480 period (Now where have I seen that resolution before?:)). Depending on whether you have set the TV-out to 4:3 or 16:9 it will scale the video to fit these numbers. In my case the Matrox will assume any video with an aspect ratio of <~1.5 is actually a 4:3 video and will scale it accordingly. At some point though, AR > 2(? not sure exactly) , it will assume that it should add letterboxing and does so. (Of course if I set the TV-format to 4:3 it will add letterboxing to 16:9 videos also)

I also knows that the Sigma chip from the Hollywood+ card is used in some standalone DVDs and STBs so normally there is NO difference between a TV-out from a computer or a standalone DVD/STB.

[movmasty]

Originally posted by hakko504
As far as I can tell most TV-out have a resolution of 720(704)x576/480 period
720/704 are digital formats,tv sets have 640 or less dots,
640x480 or 640x576,then since (576/3)*4=768, we have 704 like(640+768)/2
and the way the tv draws the horizontal pixels is very different from the vertical

Originally posted by hakko504
At some point though, AR > 2(? not sure exactly)
i guessed that, we are still not able to find a precise ratio to send to the tv-out.

i think that the tv out let you choose if fill vertically all the screen,or give each pixel to a line,
but cant do this horizontally

[hakko504]

Let's put it this way: All MPEG TV-outs have a resolution of 720x480/576. They do not resize the MPEG stream in any way unless the convert from 16:9 to 4:3. This have nothing to do with how many pixels the TV:s have. If 720 is larger than the actual number of pixels on the screen then they will blend together into the actual resolution of the TV.

[movmasty]

Originally posted by hakko504
Let's put it this way: All MPEG TV-outs have a resolution of 720x480/576. They do not resize the MPEG stream in any way unless the convert from 16:9 to 4:3. This have nothing to do with how many pixels the TV:s have. If 720 is larger than the actual number of pixels on the screen then they will blend together into the actual resolution of the TV.
ok, but were talking about videos at lower res, specially vertical res.
how will it be output from the tv-out?

[hakko504]

Originally posted by movmasty

ok, but were talking about videos at lower res, specially vertical res.
how will it be output from the tv-out?
Resized to fit 720x480/576.