AW: Impossible to play a rtsp stream

[Tim-Philipp Müller]

On Mon, 2012-07-16 at 15:05 +0200, Dominik Schröder wrote:

Hi,

> For the first one I get:
> 
> root [ ~ ] $ gst-launch-0.10 -v rtspsrc location=rtsp://172.16.10.151:5544/cif ! rtph264depay ! h264dec ! fastoverlaysink
> set up. fb_vinfo.xres=1024, fb_vinfo.yres=768
> (snip)
> /GstPipeline:pipeline0/GstH264Dec:h264dec0.GstPad:sink: caps = video/x-h264

The first pipeline is the most basic one, and should work in some form
or another. It looks like h264 data makes it to your h264 decoder, but
the caps are a bit ... minimal. You need to check what the depayloader
outputs (bytestream or AVC) and whether your decoder supports that
stream format. You can check by putting a fakesink dump=true after the
depayloader (instead of h264dec ! fastoverlaysink).

Of course your GStreamer version (0.10.22) is ancient (from January
2009!), and no one really remembers what's supposed to work or not with
that version.

Perhaps you could update the open source GStreamer bits to the latest
releases, that makes it much easier (and interesting) to help.



> The second one (gst-launch-0.10 -v uridecodebin
> uri=rtsp://172.16.10.151:5544/cif ! fastoverlaysink) works a little
> bit. But the video stagnates very much and after some time, the
> complete stream breaks down...
> 
> I think, in any case I need the hardware accelerated h264 video codec
> (! H264dec !). It is a low power (1Ghz) Marvell PXA168 SoC. So I need
> to use the integrated accelerators... Am I right!?

Yes, you very likely need a hw-accelerated decoder.

The reason it works a little might have to do with latency handling. I
don't know anything about the decoder nor the sink (nor the status of
things with that version of GStreamer), so no idea what's up with that.
You can try fastoverlaysink sync=false  to see if that makes a
difference.


> I can play the video if it is locally stored very well/smooth (Flash memory) with: 
> 
> gst-launch -v filesrc location=/trailer.mp4 ! qtdemux name=t ! queue ! h264dec ! fastoverlaysink t.
> 
> In my opinion, for rtsp, only the filesrc changes...!? Is that wrong?

Yes.


> For your 3rd suggestion I get:
> 
> root [ ~ ] $ gst-launch-0.10 -v playbin2 uri=rtsp://172.16.10.151:5544/cif video-sink=fastoverlaysink
> WARNING: erroneous pipeline: could not set property "video-sink" in element "playbin20" to "fastoverlaysink"
> root [ ~ ] $
> 
> So I think paybin20 doesn`t work with fastoverlaysink!?

Ah, right, that doesn't work with gst-launch in that old gstreamer
version, I forgot about that.

Cheers 
-Tim