Little help with M/Jpeg encoding and streaming

[Thiago Sousa Santos]

On Tue, 2011-11-29 at 02:54 +1000, Ian Daley wrote:
> Hi there,
> 
> I am working on developing an app with gstreamer (or hoping to!) that 
> will pickup the image from a wireless IP cam and then relay this to a 
> web server. I will have multiple cameras, but I guess we'll get to that 
> later, because right now, I'm a little stuck (and perhaps a little tired 
> being 2 AM) and need a little bit of guidance.
> 
> Essentially I have a video source from an IP Camera that is in mjpeg 
> format. I currently access this through souphttpsrc via the following 
> method:
> 
> gst-launch -v souphttpsrc 
> location="http://192.168.1.195/videostream.cgi?user=admin&pwd=" 
> do-timestamp=true is_live=true ! multipartdemux ! tcpserversink port=5000
> 
> and play it back via:
> 
> gst-launch tcpclientsrc port=5000 ! jpegdec ! autovideosink
> 
> Which is simple enough... I guess, somewhere to get started. This works, 
> but of course, I don't want to stream in mjpeg, I would rather convert 
> this to something more browser friendly... this is where the problems begin.
> 
> If I try to convert it to theora I get:
> 
> gst-launch -v souphttpsrc 
> location="http://192.168.1.195/videostream.cgi?user=admin&pwd=" 
> do-timestamp=true is_live=true ! multipartdemux ! jpegdec ! videoscale 
> method=1 ! video/x-raw-yuv,width=320,height=240 ! theoraenc bitrate=150 
> ! tcpserversink port=5000
> 
> Setting pipeline to PAUSED ...
> Pipeline is live and does not need PREROLL ...
> Setting pipeline to PLAYING ...
> New clock: GstSystemClock
> /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(2574): gst_base_src_loop (): 
> /GstPipeline:pipeline0/GstSoupHTTPSrc:souphttpsrc0:

> streaming task paused, reason not-negotiated (-4)

Here's your problem, add ffmpegcolorspace converter before theoraenc to
make it convert to a format it can handle. Might be a good idea to add
one before the capsfilter as well, in case the jpegdec outputs something
different than yuv.

> Execution ended after 50288828 ns.
> Setting pipeline to PAUSED ...
> Setting pipeline to READY ...
> /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
> Setting pipeline to NULL ...
> Freeing pipeline ...
> 
> In fact... I pretty much get this with most attempts to convert it to 
> something browser friendly.
> 
> Anyone got any ideas on what would be the best way to encode this stream 
> into something that can be picked up and handled easily in browsers? 
> FWIW, even the mjpeg stream doesn't work natively in Firefox, but the 
> source does.
> 
> Kind Regards
> 
> Ian

BR,

--
Thiago
> 
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