OpenShot Video Editor

Shaky preview of videos with very high framerates

Asked by Wolfram Strauss

I want to edit videos from a high speed camera with frame rates of up to 200 fps. The preview window in Openshot is not capable of properly displaying the video nor fixed images even when I step forward single images. I get a proper image every here and then but most of the time I see only black or a few horizontal bars. Preview of the same video works without any problems in avidemux and pitivi (on the same pc).

I'm using the Openshot version included in ubuntu 10.10 and all the ffmpeg libraries are from medibuntu. Switching the preview mode from sdl to sdl_preview has no effect on the problem. The high speed videos are raw avi format with a resolution of 640x480 and 24 bit color depth having a size of around 2 gigabytes each.

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Olivier Girard (eolinwen) said : 		#1

Hi,
And if you decrease the number of fps (200 it is enormous) using the speed tab in the clip Properties (select the clip and right clic and in the contextual menu select Properties). You should realize some tests but saying with a decrease of the speed between 4 and 8 (i prefer 1/8 that will give you a 25 fps, after the following question is : are you in progressive or not). ?
It is just an idea to test.

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Wolfram Strauss (tungsten-ostrich) said : 		#2

Hi

I tried various decreases of speed (1/4, 1/8, 1/16) without any results.
I still have the same problems with the preview as before.

The videos are all in progressive.

-----Original Message-----
From: cenwen <email address hidden>
Reply-to: <email address hidden>
To: <email address hidden>
Subject: Re: [Question #137662]: Shaky preview of videos with very high
framerates
Date: Mon, 13 Dec 2010 19:40:41 -0000

Your question #137662 on OpenShot Video Editor changed:
https://answers.launchpad.net/openshot/+question/137662

    Status: Open => Answered

cenwen proposed the following answer:
Hi,
And if you decrease the number of fps (200 it is enormous) using the speed tab in the clip Properties (select the clip and right clic and in the contextual menu select Properties). You should realize some tests but saying with a decrease of the speed between 4 and 8 (i prefer 1/8 that will give you a 25 fps, after the following question is : are you in progressive or not). ?
It is just an idea to test.

Revision history for this message
Olivier Girard (eolinwen) said : 		#3

Ah. A stab in the space.
Could you provide us a short file to test with (1 or 2 minutes). Personally or show us with a screencast the result of this ? i don't see another thing for resolve this without workaround. Sorry. It will be nice to know now if it is a problem with MLT or In Openshot.
Thanks.

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