[gst-devel] Problems with clockoverlay and MJPEG stream

Fri Oct 24 04:42:08 CEST 2008

Hi Sudarshan,

I did not had the time to hack on this for a while, but finally I changed
the pipeline to this:

gst-launch-0.10 -v gnomevfssrc location=$CAMERA ! mutipartdemux !
ffdec_mjpeg ! clockoverlay text="Camera 1" ! ffmpegcolorspace !   ximagesink

The video still freezes. I still don't know why, even if the caps says that
the video is at 25fps. If I try to close the window, gst-launch does not
terminate the execution of the pipeline, I have to hit Ctrl-C to re-gain
control over the console.

Any idea?

2008/10/5 sudarshan bisht <bisht.sudarshan at gmail.com>

> Hi Noe ,
>              As you are using decodebin here as a decoder element so what
> is does is on the basis of input file it selects the decoder , here in your
> case it is selecting jpegdec(see red line in your log) , that means it will
> decode only one frame of data .
>             To fix this problem you can use ffdec_mjpeg element which is
> there in ffmpeg package.
>
>
>
> On Sat, Oct 4, 2008 at 6:06 AM, Noe Nieto <tzicatl at gmail.com> wrote:
>
>> 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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>>>
>>
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>>
>
>
> --
> Regards,
>
> Sudarshan Bisht
>
> -------------------------------------------------------------------------
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> challenge
> Build the coolest Linux based applications with Moblin SDK & win great
> prizes
> Grand prize is a trip for two to an Open Source event anywhere in the world
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