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Bug 145428 - [v4lsrc] image size and quality problem
[v4lsrc] image size and quality problem
Status: RESOLVED INVALID
Product: GStreamer
Classification: Platform
Component: gst-plugins
git master
Other Linux
: Normal normal
: NONE
Assigned To: GStreamer Maintainers
GStreamer Maintainers
Depends on:
Blocks:
 
 
Reported: 2004-07-05 01:05 UTC by Zhanglei Wang
Modified: 2005-01-26 01:30 UTC
See Also:
GNOME target: ---
GNOME version: ---


Description Zhanglei Wang 2004-07-05 01:05:51 UTC 
When I set the image size to 176x144, the image quality is terrible. But it is
good if the size is 352x288.

I use "gst-launch-0.8 v4lsrc ! ffmpegcolorspace ! ximagesink"
Comment 1 Zhanglei Wang 2004-07-05 05:09:50 UTC 
I uploaded two screen shots, 1 for v4lsrc, 1 for a program of mine.

http://www.disp.duke.edu/~zw8/qcif_v4lsrc.png
http://www.disp.duke.edu/~zw8/qcif_correct.png
Comment 2 Ronald Bultje 2004-07-05 17:02:28 UTC 
Both are 404...
Comment 3 Zhanglei Wang 2004-07-05 17:22:58 UTC 
sorry, now it's ok :)
Comment 4 Zhanglei Wang 2004-07-10 23:12:48 UTC 
Now I have an interesting discovery:

If I debug using gdb, and set a breakpoint at gst_v4lsrc_set_capture
(v4lsrc_call.c:151), and then continue, everything is ok, even if the image size
is 176x144.

But if I run it directly, or use gdb but without the breakpoint, the image is bad.

This is unbeleivable... Any idea?
Comment 5 Zhanglei Wang 2004-07-10 23:37:25 UTC 
well, I think it's must be a bug of my webcam driver. Any other size, except
176x144, works well. And now I use qcset compatible=dblbuf subsample=y, it works
well.
Comment 6 Ronald Bultje 2005-01-25 17:40:37 UTC 
Can I close this then?
Comment 7 Zhanglei Wang 2005-01-25 23:11:17 UTC 
Yes, please.
Comment 8 Ronald Bultje 2005-01-26 01:30:23 UTC 
Allrighty then.