[gst-devel] Problems with clockoverlay and MJPEG stream

[Noe Nieto]

Thanks Sudarshan

Now I've changed the pipeline to this:
gst-launch-0.10 -v gnomevfssrc location=$CAMERA ! decodebin ! clockoverlay
text="Camera 1" ! ffmpegcolorspace !  videoscale !  ximagesink
force-aspect-ratio="true"

But when I run the pipeline there is no video, it's only an still image with
the clock time overlaid, but it is not moving.

What is the problem? I have reviewed the output of gst-launch and I found a
strange warning:


Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
/pipeline0/decodebin0/typefind.src: caps = multipart/x-mixed-replace
/pipeline0/decodebin0/multipartdemux0.sink: caps = multipart/x-mixed-replace
/pipeline0/decodebin0/jpegdec0.sink: caps = image/jpeg
/pipeline0/decodebin0/jpegdec0.src: caps = video/x-raw-yuv,
format=(fourcc)I420, width=(int)640, height=(int)480,
framerate=(fraction)0/1
/pipeline0/clockoverlay0.src: caps = video/x-raw-yuv, format=(fourcc)I420,
width=(int)640, height=(int)480, framerate=(fraction)0/1
/pipeline0/clockoverlay0.video_sink: caps = video/x-raw-yuv,
format=(fourcc)I420, width=(int)640, height=(int)480,
framerate=(fraction)0/1
/pipeline0/decodebin0.src0: caps = video/x-raw-yuv, format=(fourcc)I420,
width=(int)640, height=(int)480, framerate=(fraction)0/1
/pipeline0/decodebin0.src0.proxypad1: caps = video/x-raw-yuv,
format=(fourcc)I420, width=(int)640, height=(int)480,
framerate=(fraction)0/1

(gst-launch-0.10:9349): GStreamer-CRITICAL **: gst_util_uint64_scale_int:
assertion `denom > 0' failed
/pipeline0/ffmpegcsp0.src: caps = video/x-raw-rgb, bpp=(int)32,
depth=(int)24, endianness=(int)4321, red_mask=(int)65280,
green_mask=(int)16711680, blue_mask=(int)-16777216, width=(int)640,
height=(int)480, framerate=(fraction)0/1, pixel-aspect-ratio=(fraction)1/1
/pipeline0/ffmpegcsp0.sink: caps = video/x-raw-yuv, format=(fourcc)I420,
width=(int)640, height=(int)480, framerate=(fraction)0/1
/pipeline0/videoscale0.src: caps = video/x-raw-rgb, bpp=(int)32,
depth=(int)24, endianness=(int)4321, red_mask=(int)65280,
green_mask=(int)16711680, blue_mask=(int)-16777216, width=(int)640,
height=(int)480, framerate=(fraction)0/1, pixel-aspect-ratio=(fraction)1/1
/pipeline0/videoscale0.sink: caps = video/x-raw-rgb, bpp=(int)32,
depth=(int)24, endianness=(int)4321, red_mask=(int)65280,
green_mask=(int)16711680, blue_mask=(int)-16777216, width=(int)640,
height=(int)480, framerate=(fraction)0/1, pixel-aspect-ratio=(fraction)1/1
/pipeline0/ximagesink0.sink: caps = video/x-raw-rgb, bpp=(int)32,
depth=(int)24, endianness=(int)4321, red_mask=(int)65280,
green_mask=(int)16711680, blue_mask=(int)-16777216, width=(int)640,
height=(int)480, framerate=(fraction)0/1, pixel-aspect-ratio=(fraction)1/1
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
Caught interrupt -- handling interrupt.
Interrupt: Setting pipeline to PAUSED ...
Execution ended after 8957877000 ns.
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
/pipeline0/ximagesink0.sink: caps = NULL
/pipeline0/videoscale0.src: caps = NULL
/pipeline0/videoscale0.sink: caps = NULL
/pipeline0/ffmpegcsp0.src: caps = NULL
/pipeline0/ffmpegcsp0.sink: caps = NULL
/pipeline0/clockoverlay0.src: caps = NULL
/pipeline0/clockoverlay0.video_sink: caps = NULL
/pipeline0/decodebin0.src0: caps = NULL
/pipeline0/decodebin0/jpegdec0.src: caps = NULL
/pipeline0/decodebin0/jpegdec0.sink: caps = NULL
/pipeline0/decodebin0/multipartdemux0.src_0: caps = NULL
/pipeline0/decodebin0/multipartdemux0.sink: caps = NULL
/pipeline0/decodebin0/typefind.src: caps = NULL
Setting pipeline to NULL ...
X connection to :0.0 broken (explicit kill or server shutdown).

Is there a work around this, or a typical problem?

Thank you.

2008/10/2 sudarshan bisht <bisht.sudarshan at gmail.com>

> Hi Noe ,
>
>      Your problem is because clockoverlay element works on YUV 4:2:0 data (
> see caps by doing gst-inspect clockoverlay ) that means it expects YUV 4:2:0
> data from previous element and sends YUV 4:2:0 data also to next element
> .  But ximagesink works on RGB data thats why you can't connect these tow
> elements .
>    To solve this problem insert clockoverlay just after decodbin element
> .
>
>
> On Thu, Oct 2, 2008 at 12:37 AM, Noe Nieto <tzicatl at gmail.com> wrote:
>
>> Hi, I had posted this topic before but I am unsure if it reached the
>> mailing list.
>>
>> I have an app that displays MJPEG Streams from webcam cameras that looks
>> like the following:
>>
>> gst-launch-0.10 gnomevfssrc location="http://ip/image?speed=25" !
>> decodebin ! ffmpegcolorspace ! videoscale ! ximagesink
>> force-aspect-ratio="true"
>>
>> But when I add a clockoverlay element between the videoscale and
>> ximagesink, the video gets frozen. Looks like it just displays the first
>> frame.
>>
>> Can someone please, help me? What I am doing wrong.
>>
>> Noe Nieto.
>>
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>
>
> --
> Regards,
>
> Sudarshan Bisht
>
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