[gst-devel] Problems with clockoverlay and MJPEG stream

Noe Nieto tzicatl at gmail.com
Fri Nov 14 22:49:54 CET 2008 

I tested this pipeline on Ubuntu Intrepid,
It comes with gstreamer 0.10.21
gst-launch-0.10 - gnomevfssrc do-timestamp=true location=$CAMERA !
mutipartdemux !  jpegdec ! timeoverlay ! ffmpegcolorspace !   ximagesink

The time overlay works and video is not freezing. The modifier do-timestamp
is the one that fixed the problem.

Thanks to anyone who answered.


2008/10/24 Noe Nieto <tzicatl at gmail.com>

> This is strange,
>
> If I use the test pipeline that comes in the documentation of the
> clockoverlay element. This works well, but mine's do not.
>
> gst-launch -v videotestsrc ! clockoverlay halign=right valign=bottom
> text="Edge City" shaded-background=true ! ffmpegcolorspace ! ximagesink
>
> gst-launch-0.10 -v gnomevfssrc location=$CAMERA ! mutipartdemux !
> ffdec_mjpeg ! clockoverlay text="Camera 1" ! ffmpegcolorspace !   ximagesink
>
>
> Why does it work with videotestsrc and why it does it freezes with a MJPEG stream form network?
>
>
>
>
> 2008/10/23 Noe Nieto <tzicatl at gmail.com>
>
> Hi Sudarshan,
>>
>> I did not had the time to hack on this for a while, but finally I changed
>> the pipeline to this:
>>
>> gst-launch-0.10 -v gnomevfssrc location=$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
>>>>>
>>>>>
>>>>> -------------------------------------------------------------------------
>>>>> This SF.Net email is sponsored by the Moblin Your Move Developer's
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>>>>> Build the coolest Linux based applications with Moblin SDK & win great
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>>>>>
>>>>>
>>>>
>>>>
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>>>>
>>>
>>>
>>> --
>>> Regards,
>>>
>>> Sudarshan Bisht
>>>
>>> -------------------------------------------------------------------------
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>>> prizes
>>> Grand prize is a trip for two to an Open Source event anywhere in the
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>>
>
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