Captured video frames are poor quality

[anno domini]

Hi,

So tried out the queue...unfortunately didn't appear to make any difference.
However i have seen that using deinterlace seems to prevent the any strange
frames being produced.
Unfortunately though is probably wont work either for me because the
overall quality is noticeably poorer using deinterlace i.e. the frames are
less well defined in terms of details and sharpness.

To be honest i am looking at this because of another issue that i saw with
the pngenc element when using python bindings for generating snapshots
within a script.
I'll start a new thread as it is a different issue. If i could fix that
then i the issue i'm describing in this thread will be redundant for me.

Thanks!




On Mon, Aug 11, 2014 at 8:29 AM, anno domini <genericgroupmail at gmail.com>
wrote:

> Thanks Nicolas for your reply.
> I will take a look at your suggestions.
>
> Thanks again!!!!
>
>
> On Fri, Aug 8, 2014 at 5:31 PM, Nicolas Dufresne <
> nicolas.dufresne at collabora.com> wrote:
>
>> Le vendredi 08 août 2014 à 17:22 +0100, anno domini a écrit :
>> > gst-launch v4l2src device=/dev/video1 norm=PAL ! ffmpegcolorspace !
>> > pngenc snapshot=true ! filesink location=screenshot.png; shotwell
>> > screenshot.png
>> >
>> >
>> > I've also tried:
>> >
>> > gst-launch v4l2src device=/dev/video1 norm=PAL num-buffers=1 !
>> > ffmpegcolorspace ! jpegenc ! filesink location=screenshot.jpeg
>>
>> Can't offer you a "this is the answer", but I have a guess, that would
>> imply a buggy driver. It is likely that the driver miss-behave if you
>> are not reading frames fast enough (hence the visual corruption). Try
>> for this adding a queue after the v4l2src. It may improve, but it won't
>> fix the problem entirely. My recommendation would be, make sure your
>> kernel and driver is up to date, switch to GStreamer 1.4, and add debug
>> traces if not already in the kernel driver to figure-out what is being
>> triggered when the corruption is visible. Finally, you can enabled
>> traces in GStreamer with environment GST_DEBUG="v4l2*:7".
>>
>> Nicolas
>>
>>
>> _______________________________________________
>> gstreamer-devel mailing list
>> gstreamer-devel at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>>
>
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