VLC-0.8.5 unable to play video with 120fps

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hbpencil
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VLC-0.8.5 unable to play video with 120fps

Postby hbpencil » 25 Nov 2006 12:17

VLC-0.8.5 was unable to play DivX video with 120fps smoothly. It jerked about and lost loads of frames.

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Postby eAi » 25 Nov 2006 15:35

I wouldn't be that surprised. 120fps is about 4-5 times higher FPS than the average video. What resolution was it? What OS? How fast a computer was it?

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Postby hbpencil » 25 Nov 2006 23:00

Spec
Microsoft Windows XP Home Edition 5.1.2600 Service Pack 2
Intel(R) Pentium(R) M processor 2000MHz
1024MB RAM
74.428 [GB] HDD
NVIDIA GeForce FX Go5600 128MB
1280 x 800

Video
640x480
DivX 6.1
25:00min

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Postby DJ » 26 Nov 2006 00:36

Most video cards running under Windows have trouble playing 60 FPS in any format. This is true for the overhead in most operating systems. These types of files are rather rare and when you find them were intended for some sort of testing. So this rather seems like an act of futility, at least in my opinion. All of this has little bearing on VLC, but has everything to do with your system.

Try looking at CPU usage with your Task Manager if you are running Windows.

hbpencil
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Postby hbpencil » 27 Nov 2006 22:59

The average CPU usage is 12% on VLC

DJ
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Postby DJ » 28 Nov 2006 03:07

Depending on the format and the resolution the CPU usage may be low, this still doesn't mean the video card can do it and in most cases it can't. For example I hover about 60 to 70% doing 720p in WMv running 60 fps it skips wildly in any player and the specs on my machine are considerably better than yours.

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Postby Mimiru » 28 Nov 2006 20:48

A little math might help to know what's going on ......

We talk about a laptop here if I'm not mistaken...... so you talk of an LCD monitor integrated to your laptop ..... witch is a year old .....

The best integrated LCD for laptop has a response time of 12 ms ...... and this is the constructor spec (much time, it's the best response time between two colors only ..... not all colors) ..... but let's say that it respect 12ms for all cases.

Your video is 120 fps ...... it means that there is a new image each 8.3 ms (1s/120 frames) ..... So first, technicaly, it's impossible to your screen to show you really 120fps with or without vlc or a game.

Let's say that you have a real LCD that respect 8ms or a 6ms of response time (witch does not exist ...... 8ms or 6ms exist, but none respect for all the image). Even here your monitor can't show you that speed of image ..... because you have connected it thru a VGA connector (and not DVI). And with VGA it need to be converted to digital ..... and this process can't be that fast due to the enormous amount of data and the electronic response time of the needed components.

Everything here is without saying that, normaly, in a laptop, they disminish the speed of all bus .... for reason of energy saving ;)


Now why It's not the same with other players and you see it weird with VLC ?
Because vlc is showing you at 120 fps but your screen can't show you that much and need to "jump" some frame or "fuse" some frame ..... Other players adapt their velocity to the screen to avoid this effect :)

I hope that I've remained clear :)

Sorry but you need a good CRT monitor and a real computer (not laptop) for what you wish for .... :(

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Postby hbpencil » 28 Nov 2006 22:00

Are you saying that my notebook is not a "real" computer! I'm offended... not really. I kind of knew these things but I was too lazy to ask the real question, which was will there be some kind of feature implantation into VLC media player that will allow smoother playback of videos with higher than normal fps?

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Postby DJ » 28 Nov 2006 23:37

Considering this is hardware dependent, NO.

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Postby Mimiru » 30 Nov 2006 19:06

I know some filters that might do the trick but they are too heavy to do it in real time ....... your framerate may drop to 2fps ;) or worse considering your computer :)


Plus you must know that 120 fps is a little stupid ..... the average human eye does not see the difference between 70 fps and 120fps for example ...... 120fps is the ultra limit for an exceptional and rare human eye for perceiving things like flickering or subliminal images ....... and this in the optimal situation (not tired, eyes with correct humidity, correct level of vitamin, no deformation in the eye, 17/10 minimal in each eye, etc).
We talk of a percentage of the population so low that it is possible that you might never see one person like this in your entire life.

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Postby eAi » 01 Dec 2006 23:05

If you found a way to cut out 80% of the frames, you might have more success :)


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