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Old 20th June 2008
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Default video on FreeBSD?

How is video development coming along in FreeBSD? Playback basically works on 6.3...the playback pace is noticably quickened, however...kind of an interesting phenomenon...seems like something easily correctable.

How is it on 7? 7 doesn't work well at all on my Dell OptiPlex, BTW...I'm guessing it was designed more for the newer hardware.


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Old 20th June 2008
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What do you mean 'video development'? With what program?
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Old 20th June 2008
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I think he means accelerated playback of video... if you have a device with XVideo/Xv support, then it should work fine in any supported players. (mplayer/vlc.. xine/ogle.. etc)

If you get verbose output from:
% xvinfo
You're probably set to watch a video...
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how come the playback pitch higher and speed slightly quickened?

I get the same effect regardless of movie format.
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Old 20th June 2008
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It might help if you would tell which player you're using, which version of the player you're using, which video files you're using, which version of FreeBSD you're using, if you tried other video players.
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Old 21st June 2008
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Damien: That sounds like the 24fps/25fps issue.
Outside of the US, the standard for video (with few exceptions) is 25 frames per second. (US uses a hair under 30fps). Movies are universally filmed at 24 fps. This is generally dealt with by simply playing the movie at 25 fps, which is a 4% increase in speed. A 100 minute movie now shows in 96 minutes. The pitch shift is only noticeable (to most people) when doing a side-by-side comparison. Today, most studios do a pitch transformation on the audio, so even that is not an issue. (The alternative, that is, repeating every 24th frame, would produce a noticeable jitter.)
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Old 21st June 2008
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Quote:
Originally Posted by robbak View Post
Damien: That sounds like the 24fps/25fps issue.
Outside of the US, the standard for video (with few exceptions) is 25 frames per second. (US uses a hair under 30fps).
Japan, Canada, South Korea, Taiwan, Mexico and some South American countries also use NTSC
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is that right? wow....I didn't realize cinematographal technical standards were so tightly integrated in software architectures like that.
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I guess the next hot administrivia question is going to be what environment variable to tweak to get it 'up to speed again' ;-)


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To repeat:
It might help if you would tell which player you're using, which version of the player you're using, which video files you're using, which version of FreeBSD you're using, and if you tried other video players.
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Old 22nd June 2008
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What model Dell Optiplex do you have? Mine has worked perfectly.
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Quote:
Originally Posted by Damien787 View Post
is that right? wow....I didn't realize cinematographal technical standards were so tightly integrated in software architectures like that.
Not necessarily.

The video you are seeing could be incorrectly labeled as 25fps, and your video playing software is honoring that label. You can override that label by directly specifying the frame rate (in mplayer, at least: It would help us greatly if you'd tell us what player you are using, and some little clue as to what the video is!)
Or you could be comparing it to playing it on a DVD player and TV. The computer may be playing it at the correct 24fps, but the TV playing it at 25.

Video is not simple! Just wait until you try to get your head around interlacing! and colour spaces, too!
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