Adding videoflip to pipeline creates errors

[4ernov]

Hi, Rob,

I've recently worked with videoflip, too, and I've noticed that it's
pretty sensitive to colorspace of its input. Consider adding
ffmpegcolorspace right before videoflip element in the second
pipeline, I think it should help. In my case it also saved about 50%
of CPU performance.

> Hello,
>
> I'm running into problems with my pipeline, where basically i'd like to
> rotate the video source by 180 degrees. I'm running on an embedded
> device, using TI hardware dsp encoder. The pipeline that i'm starting
> with is this:
>
> v4l2src !
> video/x-raw-yuv,format=(fourcc)UYVY,width=320,height=240,framerate=10/1 ! TIVidenc1 engineName=codecServer codecName=h264enc ! rtph264pay name=pay0 pt=96
>
> I'm using this pipeline with the example code found with the gst-rtsp
> server package, and it works fine. However, whenever I add the videoflip
> plugin, I just get errors. This is the pipeline i've tried:
>
> v4l2src !
> video/x-raw-yuv,format=(fourcc)UYVY,width=320,height=240,framerate=10/1 ! videoflip method=2 ! TIVidenc1 engineName=codecServer codecName=h264enc ! rtph264pay name=pay0 pt=96
>
> which outputs the error messages:
>
> 0:00:08.377593970  1629    0x11008 ERROR
> GST_PIPELINE ./grammar.y:614:gst_parse_perform_link: could not link
> v4l2src0 to videoflip0
> 0:00:08.388915992  1629    0x11008 ERROR
> GST_PIPELINE ./grammar.y:614:gst_parse_perform_link: could not link
> videoflip0 to tividenc10
> 0:00:08.389617897  1629    0x11008 WARN        rtspmediafactory
> rtsp-media-factory.c:508:default_get_element: recoverable parsing error:
> could not link v4l2src0 to videoflip0
> 0:00:08.420776344  1629    0x11008 WARN               rtspmedia
> rtsp-media.c:911:alloc_udp_ports: multiudpsink version found without
> buffer-size property
> 0:00:16.318237290  1657    0x11008 WARN                    v4l2
> gstv4l2object.c:1842:gst_v4l2_object_probe_caps_for_format:<v4l2src0>
> Could not probe minimum capture size for pixelformat UYVY
>
>
> I've also tried with queues added either side of videoflipCan anyone
> give guidance as to these errors and warning, and what I might need to
> add in the pipeline to fix this?
>
> Thanks very much,
> Rob Smith