[QLab] supported video formats

[Dieter Demerre]

Hi,

When experimenting with Qlab, I encountered a video file that
apparently cannot be displayed in Qlab. Audio is played back
correctly.
VLC, Qt, and preview all can visualise the video.

I open the format information in VLC, and it states:
Video format XVID,
Framerate 23,976000

When opening in Qt (10.4) with Perian, it states
Xvid (perian) 512x364, millions, mpeg layer 3, mono, 48,000 kHz,
FPS 23,98

Now I can (try to) convert the video to another format... I'd like to
know what format(s) are recognized and played back by QLab ?

Friendly greetings,
dd
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[Paul Gotch]

On Tue, Apr 13, 2010 at 12:19:27AM -0700, Dieter Demerre wrote:
> I open the format information in VLC, and it states:
> Video format XVID,
> Framerate 23,976000

xvid is actually MPEG4 however the metadata might not be ISO conformant
so QuickTime may not be able to play it.

VLC can play it because it doesn't use QuickTime. Perian contains an
xvid decoder as a quicktime component which is why QuickTime player can
play it. I'm suprised that having Perian installed doesn't allow QLab
to play it, however maybe Perian can't be used on a background thread.

> Now I can (try to) convert the video to another format... I'd like to
> know what format(s) are recognized and played back by QLab ?

Potentially anything that is supported QuickTime. Although not all
formats can decode on background thread. In which cases you may get no
audio, or no video or it appears to play and you get neither audio nor
video.

In terms of crosscoding try

http://www.squared5.com/

That ought to be able to consume the xvid file (as long as you have
Perian installed) and output an mp4 via using QuickTime which will work
in QLab.

MPEGStreamClip can also output anything else there is a QuickTime
encoder installed for, best of all it's free.

-p
--
Paul Gotch
--------------------------------------------------------------------

[Dieter Demerre]

thanks for the reply Paul.
I put the video in iMovie, but iMovie wouldn't recognize it either.
Then I used VLC, and converted the movie to H264 + MPEG audio, into an
MPEG TS format, and that was recognized and is played by Qlab.

grts.
dd.

On Apr 13, 1:09 pm, Paul Gotch <paulg+q...@chiark.greenend.org.uk>
wrote:

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