spierala

I?m trying to capture Video from a DVPAL-Cam via Firewire.

My jit.qt.grab object has this attributes:

jit.qt.grab 720 576 @codecquality 5 @standard pal @vmode 2

A strange thing is happening if I send a write message to the jit.qt.grab object (attributes: /Users/spierala/Desktop/clip.mov 25 jpeg lossless).

Suddenly the quality is becoming worse. It looks like vmode 0 or 1 qualtity.

I have to open the grabber component again to get the vmode 2 quality again.

I can only capture in good quality with the jit.qt.record object. But I don?t have enough performance for realtime recording at a framerate of 25fps. So send a write message to jit.qt.grab should be the perfect solution. But does somebody know how to get the maximum of quality out of it?

I can watch the video in a jit.pwindow.
with vmode 2 i get the best quality.

A strange thing is happening if I send a write message to the jit.qt.grab object (attributes: /Users/spierala/Desktop/clip.mov 25 jpeg lossless).
Suddenly the quality is becoming worse. It looks like vmode 0 or 1 qualtity.
I have to open the grabber component again to get the vmode 2 quality again.

capturing-video-to-disk-bad-quality

Sounds like there may be 2 things happening here. There was a bug 

fixed this past week (will be in the next update) that was causing 

codec and quality to be ignored when writing files to disk. However, 

this quality-reset issue is something I will have to look at and get 

back to you on. Sounds like it might be a bug, but until I see it for 

Am 07.09.2006 um 02:32 schrieb flo spier:

> I can watch the video in a jit.pwindow.

> A strange thing is happening if I send a write message to the 

> jit.qt.grab object (attributes: /Users/spierala/Desktop/clip.mov 25 

> Suddenly the quality is becoming worse. It looks like vmode 0 or 1 

> I have to open the grabber component again to get the vmode 2 

> I can only capture in good quality with the jit.qt.record object. 

> But I don?t have enough performance for realtime recording at a 

> framerate of 25fps. So send a write message to jit.qt.grab should 

> be the perfect solution. But does somebody know how to get the 

Sounds like there may be 2 things happening here. There was a bug  
fixed this past week (will be in the next update) that was causing  
codec and quality to be ignored when writing files to disk. However,  
this quality-reset issue is something I will have to look at and get  
back to you on. Sounds like it might be a bug, but until I see it for  
myself, I can't say.

> I can watch the video in a jit.pwindow.
> with vmode 2 i get the best quality.
>
> A strange thing is happening if I send a write message to the  
> jit.qt.grab object (attributes: /Users/spierala/Desktop/clip.mov 25  
> jpeg lossless).
> Suddenly the quality is becoming worse. It looks like vmode 0 or 1  
> qualtity.
> I have to open the grabber component again to get the vmode 2  
> quality again.
>
> I can only capture in good quality with the jit.qt.record object.  
> But I don?t have enough performance for realtime recording at a  
> framerate of 25fps. So send a write message to jit.qt.grab should  
> be the perfect solution. But does somebody know how to get the  
> maximum of quality out of it?


I was able to reproduce and repair this behavior for the next 

I was able to reproduce and repair this behavior for the next  
release. Thanks for the report.

> Suddenly the quality is becoming worse. It looks like vmode 0 or 1  
> qualtity.
> I have to open the grabber component again to get the vmode 2  
> quality again.


capturing video to disk (bad quality!)