Error reading an IP camera MJPEG stream

[Wim Taymans]

On 09/01/2011 01:32 PM, Icarus Alive wrote:
> Hi,
>
> Got a rather tacky little east-asian IP camera (apparently a Foscam
> knock-off), and trying to write a little DIY DVR (of sorts) for it on
> Linux (Debian 'Sid'). Here's the command I use:
>
> icarus at crunchex:~$ gst-launch-0.10 -v souphttpsrc
> location=http://icarus:icarus123@192.168.1.20:8012/videostream.cgi
> do-timestamp=true ! multipartdemux ! jpegdec ! autovideosink

You need .. ! jpegdec ! ffmpegcolorspace ! autovideosink

Wim

>
> and here's what I get.
>
> Setting pipeline to PAUSED ...
> Pipeline is PREROLLING ...
> /GstPipeline:pipeline0/GstJpegDec:jpegdec0.GstPad:sink: caps = image/jpeg
> /GstPipeline:pipeline0/GstJpegDec:jpegdec0.GstPad:src: caps =
> video/x-raw-yuv, format=(fourcc)I420, width=(int)640, height=(int)480,
> framerate=(fraction)0/1
> ERROR: from element
> /GstPipeline:pipeline0/GstSoupHTTPSrc:souphttpsrc0: Internal data flow
> error.
> Additional debug info:
> gstbasesrc.c(2582): gst_base_src_loop ():
> /GstPipeline:pipeline0/GstSoupHTTPSrc:souphttpsrc0:
> streaming task paused, reason not-negotiated (-4)
> ERROR: pipeline doesn't want to preroll.
> Setting pipeline to NULL ...
> /GstPipeline:pipeline0/GstJpegDec:jpegdec0.GstPad:src: caps = NULL
> /GstPipeline:pipeline0/GstJpegDec:jpegdec0.GstPad:sink: caps = NULL
> /GstPipeline:pipeline0/GstMultipartDemux:multipartdemux0.GstPad:src_0:
> caps = NULL
> Freeing pipeline ...
>
> The username/password for the challenged domain is correct, as I can
> test it with exact same URL in Firefox, and similarly in vlc. Could
> someone suggest what I should be checking and what might be wrong ?
>
> On reading around, I found 2 different syntaxes on reading MJPEG
> streams off IP cams, and not sure which one is to be used, and what's
> the difference --
>
> Approach-1: (writes to file)
> gst-launch -v souphttpsrc location=http://10.11.12.13/mjpeg
> do-timestamp=true ! multipartdemux
>     ! image/jpeg,width=640,height=480 ! matroskamux
>     ! filesink location=mjpeg.mkv
>
> Approach-2: (displays on local display device)
> gst-launch souphttpsrc
> location=http://admin:1234@192.168.1.150/mjpg/video.mjpg timeout=5 !
> jpegdec ! glimagesink force-aspect-ratio=true
>
> In first approach, there's a step of demuxing multipart encoded JPEGs,
> and then possibly specifying image decode with certain attributes. In
> second approach I don't see any multipart encode handling, and direct
> invocation of jpeg-decoder.
>
> In my setup, I don't even seem to have a glimagesink though !
>
>
> ~ Icarus
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